LocalToolZ

Dev Tools

Dev Tools: QR Code Generator, JSON Prettify, Regex Tester, Base64 Encode/Decode, URL Encode Decode Parse. Free online tools that run entirely in your browser — no upload, 100% private.

JSON

TSV to JSON Convert TSV to JSON online free. Supports headers, auto type detection, and minification. All processing in browser. JSON to CSV Free online JSON to CSV converter. Flatten nested objects with dot notation, choose custom delimiters, and download instantly. 100% browser-based, no upload needed. CSV to JSON Converter Convert CSV to JSON online free. Supports custom delimiters, header-based objects, auto type detection. All processing in browser. XML Beautifier Free online XML beautifier. Format, prettify and indent XML instantly in your browser with customizable options. XML Validator Validate XML syntax and structure instantly. Detect errors with precise line numbers and detailed messages. Free, secure, and runs entirely in your browser. SQL to JSON Convert SQL INSERT statements to JSON arrays or objects instantly. Supports multi-row VALUES, NULL handling, auto type detection, and pretty print. 100% client-side, no upload. JSON Stringify Convert JavaScript objects and arrays to JSON strings with customizable indentation and HTML escaping. Free, runs entirely in your browser with no data uploaded. YAML Tree Viewer Parse YAML into an interactive collapsible tree. Supports multi-document YAML, anchors & aliases, search, JSON conversion, and drag & drop .yaml/.yml files. JSON Compare Free online JSON comparison tool. Compare two JSON objects side by side, find differences with dot-notation paths, detect missing keys and value mismatches. Runs entirely in your browser with no data upload. JSON Tree Viewer Visualize JSON data as an interactive collapsible tree. Search keys and values, track JSONPath on hover, and handle large files with lazy loading. Drag & drop .json files supported. JSON Path Finder Navigate nested JSON data with path expressions. Supports dot notation, bracket notation, and array indexing with instant results and path listing. JSON Escape Escape and unescape JSON strings online. Convert special characters like quotes, backslashes, and newlines to safe escape sequences instantly in your browser. JSON to Go Struct Convert JSON to Go struct definitions instantly. Paste JSON and get clean Go code with proper types, json tags, and omitempty support. JSON to TypeScript Instantly convert JSON to TypeScript interfaces and type definitions. Supports nested objects, arrays, and union types. YAML to XML Free online YAML to XML converter. Paste YAML and instantly get well-formatted XML output with support for nested objects, arrays, and custom root elements. XML to YAML Convert XML to YAML format instantly. Paste XML and get clean, formatted YAML output with support for attributes, nested elements, and arrays. XML to JSON Free online XML to JSON converter. Paste XML and get properly formatted JSON output instantly with validation and structure preservation. JSON to XML Convert JSON to XML format with customizable indentation and optional XML declaration. Runs entirely in your browser. YAML to JSON Instantly convert YAML to JSON format online. Paste YAML, get clean JSON output with validation and formatting. JSON to YAML Convert JSON to YAML format instantly. Paste JSON and get clean, properly indented YAML output. JSON Minify Compress and minify JSON by removing all whitespace, tabs, and newlines. Reduce JSON file size by up to 70% instantly in your browser. JSON Validator Validate JSON syntax instantly with detailed error messages and line numbers. Free online tool that runs 100% in your browser. JSON Prettify Format and beautify JSON with customizable indentation. Instantly prettify compressed JSON online in your browser. TOML ↔ JSON Converter Free online TOML to JSON converter and JSON to TOML converter. Live conversion with error line/column hints, configurable indent. Runs entirely in your browser, no upload. JSON to SQL Convert a JSON array of objects into SQL INSERT statements for MySQL, PostgreSQL, SQLite or SQL Server, with optional CREATE TABLE, inferred column types and JSON string columns for nested objects — fully in your browser. JSON Schema Validator Free online JSON Schema validator. Check any JSON document against a draft-07 or 2020-12 schema and get instant errors with path, keyword and message — powered by Ajv, entirely in your browser. JSON Schema Generator Free online JSON Schema generator. Paste example JSON and instantly infer a draft-07 or 2020-12 schema with required properties, array merge strategies and string format detection — running entirely in your browser.

Code

Chmod Calculator Free online chmod calculator to visualize and calculate Linux file permissions with checkboxes. Instantly convert between numeric (755, 644) and symbolic notation (rwxr-xr-x). Supports special permissions like setuid, setgid, sticky bit. ASCII Table Complete ASCII character encoding reference with decimal, hexadecimal, octal, binary codes, HTML entities, and character descriptions. Search and filter instantly. HTTP Request Tester Test REST APIs directly in your browser. Send GET, POST, PUT, DELETE requests with custom headers, body, and query parameters. View response status, headers, and JSON body instantly. .htaccess Generator Generate Apache .htaccess rules for redirects, rewrites, security headers, caching, compression, and more. Robots.txt Generator Free online robots.txt generator. Create and customize robots.txt files to control search engine crawling, manage crawler access, and optimize your site's SEO with an easy visual editor. Sitemap Generator Free online XML sitemap generator. Add URLs, set priorities, change frequencies and create SEO-friendly sitemaps instantly in your browser. Crontab Guru Parse and explain cron expressions. Shows human-readable schedule description and next execution times. Crontab Generator Generate and validate cron expressions with instant human-readable explanations. Visualize schedules, preview next execution times, and export to crontab format. Perfect for Linux/Unix system administrators. Parquet Viewer Open Parquet files online and browse the data with pagination. Inspect the schema, view rows page by page and export to CSV or JSON - processed entirely in your browser. SQLite Online Run SQLite queries in your browser. Open .db/.sqlite/.sqlite3 files or create an in-memory database, run multi-statement SQL, export results as CSV or JSON. Docker Run to Compose Convert docker run commands to docker-compose.yml online and turn compose files back into docker run commands. Free converter that runs in your browser. Mermaid Editor Create flowcharts, sequence diagrams, Gantt charts and more from text with the Mermaid live editor. Render, zoom and export SVG or PNG in your browser. Zip / Unzip Online Create ZIP archives and extract ZIP files online for free. Compress multiple files with adjustable compression level, right in your browser - no upload. HTML to Markdown Convert HTML code to clean Markdown format instantly. Supports headings, lists, links, images, tables, code blocks and more. Markdown Previewer Free online Markdown editor with live preview. Write, render, and export Markdown with full GFM support including tables, code blocks, and task lists. Markdown to HTML Convert Markdown to clean HTML instantly with live preview. Free, private, runs entirely in your browser. Slug Generator Free online slug generator. Create SEO-friendly, URL-safe slugs from any text instantly. Removes special characters & diacritics, converts to lowercase. 100% browser-based, no server upload, no registration. File Splitter & Merger Split large files into smaller parts and merge them back. Pure browser-based, no upload needed. Binary File Diff Compare two binary files byte-by-byte in hex view. Highlight differences, navigate changes, and export reports. 100% local processing, no upload required. Docker Compose Validator Validate Docker Compose YAML files online for syntax errors, structure issues, and best practices. Get detailed error messages with line numbers instantly. XML Beautifier Free online XML beautifier. Format, prettify and indent XML instantly in your browser with customizable options. XML Validator Validate XML syntax and structure instantly. Detect errors with precise line numbers and detailed messages. Free, secure, and runs entirely in your browser. Open Graph Generator Generate Open Graph meta tags to optimize social media sharing previews on Facebook, Twitter, and LinkedIn with live card preview Meta Tag Generator Free online tool to generate SEO meta tags, Open Graph, and Twitter Card tags with live Google search preview. Fake Data Generator Generate fake data for testing. Create names, emails, addresses, phone numbers, and more. cURL to Code Convert cURL commands to JavaScript, Python, Go, Java, PHP, Ruby, C#, Rust code instantly. Free online converter supporting headers, POST data, auth and more. SQL Formatter & Beautifier Free online SQL formatter and beautifier. Format SQL queries with customizable indentation, keyword casing, and dialect support for MySQL, PostgreSQL, SQL Server, Oracle, SQLite. HTML Minifier Minify HTML code instantly. Remove whitespace, comments, and optimize your HTML for smaller file size. HTML Beautifier Instantly format and beautify HTML code. Convert minified HTML to clean, readable, well-indented code. Free online tool, no registration required. JS Minifier Minify JavaScript code instantly. Remove whitespace, comments, and optimize your JS for smaller file size and faster loading. JavaScript Beautifier Free online JavaScript beautifier and code formatter. Instantly convert minified or messy JS into clean, readable, properly indented code with customizable options. CSS Beautifier Format and beautify CSS code instantly. Convert minified CSS to readable, well-indented code with customizable options. CSS Minifier Free online CSS minifier. Instantly compress and optimize CSS code by removing whitespace, comments and unnecessary characters. Reduce file size for faster web performance. Regex Tester Test and debug regular expressions with real-time matching, group capture, and cheat sheet. Markdown Table Editor Create and edit Markdown tables with a visual spreadsheet-like interface. Set alignment, add rows and columns, and generate formatted Markdown code instantly. AI Token Counter Count tokens for any AI model — GPT, Claude, Gemini, Llama. Estimate API costs with custom pricing. Free, private, runs in your browser. Remove Line Numbers Remove line numbers from text online. Strips leading numbers, dots, parentheses, and separators from each line instantly. Add Line Numbers Add line numbers to any text with customizable start number, separator style, and zero-padding. Supports code snippets, legal documents, academic papers, and more. Lorem Ipsum Generator Generate customizable Lorem Ipsum placeholder text by paragraphs, sentences, or words. Free online tool for designers and developers. Side-by-Side Diff Checker Compare two texts side by side with highlighted differences. Line-by-line, word-by-word, or character-by-character comparison in dual panels. Text Diff Checker Free online text diff tool. Compare two texts side by side, instantly highlight all differences. No registration, 100% private, works offline. Sprite Sheet Generator Combine images into sprite sheet with drag-to-reorder, grid layout, padding, scale modes. Export PNG/WebP/JPG with JSON atlas data for game engines and CSS sprites. SVG Optimizer Optimize and compress SVG files instantly in your browser. Remove metadata, comments, editor junk, and reduce file size by up to 60%. SVG Viewer & Editor Preview, edit and optimize SVG files online. Real-time preview, code editing, and optimization tools. Code to Image Convert code snippets into beautiful, shareable images with syntax highlighting, custom themes, and window decorations. 100% privacy, runs entirely in your browser. Favicon Generator Create favicons from images or text/emoji. Generate multiple sizes (16x16 to 256x256) and download as PNG or ZIP. Free online tool with instant results. Placeholder Image Generator Free online placeholder image generator. Create custom dummy images with any size, background color, font color, and text. Export as PNG or SVG for web design, mockups, and prototyping. SVG to PNG Converter Convert SVG to PNG, JPEG, or WebP instantly in your browser. Customize scale, size, and background color. Free, private, no upload required. RSA Key Generator Generate RSA key pairs with 2048, 3072, 4096 bit sizes. PEM format output with fingerprint. Runs entirely in your browser. SSH Key Generator Generate secure SSH key pairs (RSA, Ed25519, ECDSA) instantly in your browser. Free online tool with OpenSSH format output, no registration required. Bcrypt Generator Generate and verify bcrypt password hashes online. Adjustable cost factor, built-in salt, real-time hash preview. All processing runs locally in your browser — no data sent to any server. JSON to Dart Converter Free online JSON to Dart converter. Paste an API sample and instantly generate typed data classes with fromJson and toJson factories, null safety and final fields, ready for Flutter. Everything runs locally in your browser. HTML to JSX Converter Free online HTML to JSX converter. Paste markup and instantly get clean React JSX with className, htmlFor, camelCase style objects, self-closing tags and safe comment escaping, processed entirely in your browser. SQL to JSON Convert SQL INSERT statements to JSON arrays or objects instantly. Supports multi-row VALUES, NULL handling, auto type detection, and pretty print. 100% client-side, no upload. JSON to Go Struct Convert JSON to Go struct definitions instantly. Paste JSON and get clean Go code with proper types, json tags, and omitempty support. JSON to TypeScript Instantly convert JSON to TypeScript interfaces and type definitions. Supports nested objects, arrays, and union types. Ruby Runner Free online Ruby runner. Write and run Ruby 3.4 code instantly in your browser with puts output, real error messages and an example library. Nothing to install. Lua Runner Free online Lua runner. Write and run Lua 5.4 code instantly in your browser with print output, error stack traces and infinite-loop protection. No install. SQL Query CSV Query CSV, JSON and Parquet files with real SQL in your browser. Powered by DuckDB WebAssembly: joins, GROUP BY, window functions. 100% local - files never uploaded. Sass to CSS Compile Sass and SCSS to CSS online. Real-time conversion with expanded or compressed output, error line numbers and full support for variables, mixins and nesting. Graphviz Editor Write DOT code and render Graphviz diagrams live in your browser. All 7 layout engines, syntax error lines, zoomable preview, SVG download and PNG export. Fully local with WebAssembly - nothing uploaded. Code Playground Online HTML, CSS and JavaScript playground with live preview, editor with line numbers and a captured console. Test snippets instantly and download the result as a single HTML file - fully in your browser. Archive Extractor Free online archive extractor. Open ZIP, 7Z, RAR (v4/v5), TAR, TAR.GZ and more in your browser: browse entries, extract single files or unpack everything as a ZIP. 100% local — archives never leave your browser. Tailwind Playground Write HTML with Tailwind CSS v4 utilities and compile it live in your browser. ULID Generator Generate universally unique lexicographically sortable identifiers (ULID) online. Decode ULIDs, extract timestamps, and batch create IDs for databases and distributed systems. JSON to SQL Convert a JSON array of objects into SQL INSERT statements for MySQL, PostgreSQL, SQLite or SQL Server, with optional CREATE TABLE, inferred column types and JSON string columns for nested objects — fully in your browser. CSV to SQL Convert CSV or TSV into ready-to-run SQL INSERT statements, with an optional CREATE TABLE and inferred column types, for MySQL, PostgreSQL, SQLite or SQL Server — entirely in your browser. NanoID Generator Generate secure, URL-friendly NanoID unique identifiers online. Customize length, alphabet, and calculate collision probability instantly. UUID Generator Generate random UUID v4 instantly. Create single or bulk UUIDs with one click. JWT Generator Generate signed JSON Web Tokens with custom header, payload and secret. Supports HS256, RS256, ES256 algorithms. JWT Decoder Free online JWT decoder. Decode JSON Web Tokens instantly to view header, payload and signature. No registration required. HTML Entity Decoder Decode HTML entities to characters and encode text to HTML entities. Supports named, decimal and hex entities. Free online tool, instant results in browser. JSON Schema Validator Free online JSON Schema validator. Check any JSON document against a draft-07 or 2020-12 schema and get instant errors with path, keyword and message — powered by Ajv, entirely in your browser. JSON Schema Generator Free online JSON Schema generator. Paste example JSON and instantly infer a draft-07 or 2020-12 schema with required properties, array merge strategies and string format detection — running entirely in your browser.

Encode & Decode

Hex Viewer View file contents in hex dump format with search, offset navigation, and virtual scrolling AES Encryption / Decryption AES encrypt/decrypt with CBC, CFB, CTR, OFB, ECB modes, Pkcs7/ZeroPadding/NoPadding, 128/192/256-bit keys, Base64 output, auto-detect key/IV format Brotli Compressor Free online Brotli compressor. Compress files to .br with quality 0–11 or decompress .br back to the original. Runs entirely in your browser — no upload, no install. Zstd Compressor Free online zstd compressor. Compress files to .zst with Zstandard levels 1–19 or decompress .zst back to the original. Runs entirely in your browser — no upload, no install. MessagePack Converter Free online MessagePack converter. Encode JSON to msgpack and decode msgpack hex, base64 or .bin files back to readable JSON, with a size comparison. No upload, runs in your browser. ULID Generator Generate universally unique lexicographically sortable identifiers (ULID) online. Decode ULIDs, extract timestamps, and batch create IDs for databases and distributed systems. Morse Code Converter Free online Morse code translator. Convert text to Morse code and vice versa instantly. Supports audio playback, custom symbols, and works offline in your browser. ROT13 Cipher Encode or decode ROT13 cipher instantly. Each letter shifts 13 positions in the alphabet. Free, no sign-up, runs entirely in your browser. Punycode Encoder/Decoder Free online Punycode encoder and decoder. Convert internationalized domain names (IDN) to ASCII and back instantly. Ascii85 Encode/Decode Encode text to Ascii85 (Base85) or decode Ascii85 back to text, with Adobe <~ ~> wrapping, z zero compression and the RFC 1924 IPv6 variant, entirely in your browser. Unicode Converter Convert text to Unicode escape sequences (\uXXXX) and back. Supports all Unicode characters including emoji, CJK, and special symbols. Free, instant, no installation required. Quoted-Printable Encode/Decode Encode text to quoted-printable (RFC 2045) or decode QP back to readable text with correct UTF-8 multibyte handling and 76-column soft line breaks, entirely in your browser. Base58 Encode/Decode Encode text to Base58 with the Bitcoin alphabet or decode Base58 back to text, with optional Base58Check (version byte 0x00/0x05) and double SHA-256 checksum verification, entirely in your browser. Base32 Encoder Decoder Instantly encode text to Base32 or decode Base32 back to text. 100% browser-based, zero data upload. RFC 4648 compliant. Ideal for TOTP secrets, OTP keys, QR code data, and binary-to-text conversion. Text to Hex Converter Free online text to hexadecimal converter. Instantly encode ASCII and Unicode text into hex values with space-separated or continuous output. Browser-based, no installation needed. Hex to Text Converter Convert hexadecimal strings to readable text instantly. Decode hex values into ASCII or UTF-8 text with support for multiple formats. Text to Binary Converter Convert text to binary code instantly. Free online UTF-8 binary translator with real-time conversion. Binary to Text Convert binary code to readable text. Decode binary strings (0s and 1s) into ASCII text instantly. Image to Base64 Convert images to Base64 strings and decode Base64 back to images. Supports PNG, JPG, GIF, WebP, SVG, BMP, ICO. 100% browser-based, no upload. Barcode Decoder Decode barcodes from images or camera instantly. 100% private, runs entirely in your browser. Supports EAN-13, Code 128, UPC-A, Code 39, QR and 20+ formats. Barcode Generator Free online barcode generator. Create Code 128, EAN-13, UPC-A, Code 39, QR codes instantly. Download as PNG or SVG. QR Code Decoder Decode QR codes from images or camera. Extract URLs, text, WiFi, contacts and more instantly. QR Code Generator Generate QR codes for URLs, text, WiFi, vCard, email, phone & SMS. Customize colors, size. Free, no signup, 100% browser-based. NanoID Generator Generate secure, URL-friendly NanoID unique identifiers online. Customize length, alphabet, and calculate collision probability instantly. UUID Generator Generate random UUID v4 instantly. Create single or bulk UUIDs with one click. Kana Converter Type romaji and get Japanese hiragana and katakana instantly like an IME, convert kana back to romaji, or batch-convert whole texts between hiragana, katakana and romaji. Free, private and browser-based. JWT Generator Generate signed JSON Web Tokens with custom header, payload and secret. Supports HS256, RS256, ES256 algorithms. JWT Decoder Free online JWT decoder. Decode JSON Web Tokens instantly to view header, payload and signature. No registration required. XML Escape/Unescape Instantly escape or unescape XML special characters. Convert <, >, &, ", ' to XML entities (&lt;, &gt;, &amp;, &quot;, &apos;) with real-time preview. HTML Entity Decoder Decode HTML entities to characters and encode text to HTML entities. Supports named, decimal and hex entities. Free online tool, instant results in browser. HTML Entity Encode/Decode Instantly encode or decode HTML entities. Convert special characters like <, >, &, ", ' to HTML entities and vice versa. Free, fast, and runs entirely in your browser. URL Encode Decode Parse Free online URL encoder, decoder, and parser. Convert text to percent encoding, decode URL strings, parse URL components, and extract query parameters instantly. Base64 Encode/Decode Free online Base64 encoder and decoder. Convert text to Base64 and Base64 to text instantly. No server upload, 100% private - runs entirely in your browser.

Crypto & Security

File Hash Checker Calculate and verify MD5, SHA-1, SHA-256, SHA-512 file hashes locally PDF Unlock Remove password protection from PDF files instantly in your browser. Includes smart brute-force password recovery. Protect PDF Add password protection to PDF files online for free. Encrypt PDF documents with AES-256 encryption to prevent unauthorized access. 100% browser-based, no upload required. Basic Auth Header Generator Generate HTTP Basic Authentication headers online — encode username:password to Base64 Authorization header instantly Text Encryption Secure text encryption and decryption with AES-GCM/AES-CBC. Password-based, browser-only processing, no data leaves your device. AES Encryption / Decryption AES encrypt/decrypt with CBC, CFB, CTR, OFB, ECB modes, Pkcs7/ZeroPadding/NoPadding, 128/192/256-bit keys, Base64 output, auto-detect key/IV format RSA Key Generator Generate RSA key pairs with 2048, 3072, 4096 bit sizes. PEM format output with fingerprint. Runs entirely in your browser. SSH Key Generator Generate secure SSH key pairs (RSA, Ed25519, ECDSA) instantly in your browser. Free online tool with OpenSSH format output, no registration required. Bcrypt Generator Generate and verify bcrypt password hashes online. Adjustable cost factor, built-in salt, real-time hash preview. All processing runs locally in your browser — no data sent to any server. HMAC Generator Generate HMAC hash signatures using SHA-1, SHA-256, SHA-384, or SHA-512 algorithms. Secure message authentication for API development and data integrity verification. Password Strength Checker Check password strength instantly with real-time security analysis. Test password complexity, length, and vulnerability to common attacks. OTP Generator & Validator Generate and validate TOTP/HOTP one-time passwords for 2FA. Supports SHA-1/256/512, Base32/Hex secrets, QR code export. 100% browser-based, no signup. Hash Generator Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text instantly in your browser Password Generator Generate strong, secure random passwords instantly. Customize length, characters, and create bulk passwords online — 100% browser-based, no data leaves your device. Argon2 Hash Generator Free online Argon2 hash generator and verifier. Choose argon2id, argon2i or argon2d with custom time, memory and parallelism. Runs in a Web Worker via WebAssembly — 100% local, nothing is uploaded. PGP Encryption Encrypt and decrypt PGP messages online, generate OpenPGP key pairs and inspect key fingerprints. Powered by openpgp.js and running entirely in your browser - keys and messages never leave your device. File Encryption Free online file encryption. Password-protect any file up to 512 MB with AES-256-GCM and Argon2id key derivation. Runs entirely in your browser — no upload, no install. CSR Generator Generate a free CSR (Certificate Signing Request) and RSA private key online. Fill in your domain and company details, add multi-domain SANs and download PEM files - key generation stays local in your browser. X.509 Certificate Decoder Free online X.509 certificate decoder. Paste a PEM or base64 DER certificate to inspect subject, issuer, validity, SANs, key type and fingerprints. 100% local — certificates never leave your browser. Steganography Hide secret text inside an image with LSB steganography, optionally password protected, then extract it again - all in your browser. The exported PNG looks identical to the original; never re-save it as JPEG. ROT13 Cipher Encode or decode ROT13 cipher instantly. Each letter shifts 13 positions in the alphabet. Free, no sign-up, runs entirely in your browser. JWT Generator Generate signed JSON Web Tokens with custom header, payload and secret. Supports HS256, RS256, ES256 algorithms. JWT Decoder Free online JWT decoder. Decode JSON Web Tokens instantly to view header, payload and signature. No registration required. CRC Calculator Compute CRC-8, CRC-16, CRC-32, CRC-32C, CRC-64 and Adler-32 checksums from text or files. Hex and decimal output, 15 algorithms, large files hashed in a background worker — all local in your browser. ASN.1 Decoder Decode PEM, hex or base64 DER data — certificates, keys, CRLs — into an interactive ASN.1 tree with OID names, hex view and byte highlighting, fully in your browser.

CSS

Fancy Border Radius Generator Free online fancy border radius generator. Drag 8 handles or pick a blob preset to create organic CSS shapes and copy the border-radius code instantly. Color Converter Free online color converter. Convert HEX, RGB, HSL, HSV formats instantly with visual picker. 100% private, runs in your browser. CSS Easing Generator Free online CSS easing generator. Drag the cubic-bezier control points on an interactive curve, choose from 18 presets, watch a looping ball preview and copy the timing function instantly. Text Shadow Generator Free online text-shadow generator. Stack multiple shadow layers with offset, blur, color and opacity, try Neon, 3D, Retro and Glow presets, and copy the CSS instantly. CSS Clip Path Generator Free online CSS clip-path generator. Design polygon, circle, ellipse and inset shapes with draggable points, live preview and one-click CSS code copy. CSS Beautifier Format and beautify CSS code instantly. Convert minified CSS to readable, well-indented code with customizable options. CSS Minifier Free online CSS minifier. Instantly compress and optimize CSS code by removing whitespace, comments and unnecessary characters. Reduce file size for faster web performance. CSS Border Radius Generator Visual CSS border-radius generator. Adjust each corner independently with real-time preview and copy the generated CSS code instantly. CSS Box Shadow Generator Free online CSS box-shadow generator. Visually create beautiful shadows with adjustable offset, blur, spread, color and inset. Live preview and instant code copy. CSS Grid Generator Free visual CSS Grid generator with live preview. Design responsive grid layouts interactively and export production-ready CSS code instantly. CSS Flexbox Generator Visual CSS Flexbox generator with live preview. Adjust flex properties and get ready-to-use CSS code instantly. CSS Gradient Generator Create stunning CSS gradients visually. Generate linear, radial & conic gradients with multiple color stops, custom angles and positions. Copy production-ready code instantly. SVG Optimizer Optimize and compress SVG files instantly in your browser. Remove metadata, comments, editor junk, and reduce file size by up to 60%. Color Contrast Checker Check color contrast ratios for WCAG 2.1 compliance. Verify AA and AAA standards for text and UI elements instantly. Color Palette Generator Create beautiful, harmonious color palettes instantly with our free online generator. Supports monochromatic, analogous, complementary, triadic, split-complementary, and tetradic modes. Fine-tune colors with HSL sliders, lock favorites, and export as CSS variables, Tailwind config, JSON, or SVG. 100% browser-based, your data never leaves your device. Color Picker Pick any color from screen with eyedropper. Copy HEX, RGB, HSL codes instantly. Free online color picker tool. Sass to CSS Compile Sass and SCSS to CSS online. Real-time conversion with expanded or compressed output, error line numbers and full support for variables, mixins and nesting. Tailwind Playground Write HTML with Tailwind CSS v4 utilities and compile it live in your browser. CSS Loader Generator Free CSS loader generator: ten pure-CSS loading spinners with live size, speed, thickness and color controls, then copy ready-to-paste HTML and CSS code. SVG Wave Generator Free online SVG wave generator: stack 1-5 smooth wave layers, tune baseline, amplitude, wavelength and smoothness, apply a two-color gradient and export the vector code.

Network

HAR Viewer Open HAR files online. Request table with status colors, sorting and filtering, headers, response body preview and a timing waterfall — parsed locally, nothing is uploaded. IBAN Validator Validate International Bank Account Numbers (IBAN) instantly. Check format, length, country code, and checksum for 80+ countries with real-time results. HTTP Request Tester Test REST APIs directly in your browser. Send GET, POST, PUT, DELETE requests with custom headers, body, and query parameters. View response status, headers, and JSON body instantly. Random Port Generator Generate random network port numbers from IANA standard ranges — well-known (1-1023), registered (1024-49151), and dynamic (49152-65535). Supports unique values, sorting, and bulk generation. 100% browser-based, no server needed. .htaccess Generator Generate Apache .htaccess rules for redirects, rewrites, security headers, caching, compression, and more. Robots.txt Generator Free online robots.txt generator. Create and customize robots.txt files to control search engine crawling, manage crawler access, and optimize your site's SEO with an easy visual editor. Sitemap Generator Free online XML sitemap generator. Add URLs, set priorities, change frequencies and create SEO-friendly sitemaps instantly in your browser. MAC Address Lookup Look up the vendor of any MAC address against the built-in IEEE OUI database, normalize every input format, inspect the I/G and U/L flag bits and derive the EUI-64 link-local address — with a random locally administered MAC generator, all offline. IPv6 Subnet Calculator Expand and compress IPv6 addresses, detect their type, and get the network, first and last address plus exact 128-bit address counts. Split subnets by prefix and build EUI-64 interface IDs from a MAC — all offline in your browser. HTTP Status Codes Complete reference of HTTP status codes with descriptions. Search and filter by code, category, or keyword. User Agent Parser Parse User-Agent strings to extract browser, OS, device, and engine details. Free online tool with instant results. Credit Card Validator Batch validate multiple credit card numbers at once. Identify card type, check Luhn algorithm, and verify format for Visa, Mastercard, Amex and 20+ card types. Email Validator Validate email addresses instantly. Check syntax, format, domain and RFC 5322 compliance. Support batch validation for multiple addresses. IP Validator Free online IP address validator. Check IPv4 and IPv6 addresses instantly, identify private/public ranges, view CIDR notation and network details. URL Parser & Builder Parse, decode and build URLs instantly. Visually dissect URL structure, manage query parameters, analyze path segments, and assemble new URLs bidirectionally with real-time preview. cURL to Code Convert cURL commands to JavaScript, Python, Go, Java, PHP, Ruby, C#, Rust code instantly. Free online converter supporting headers, POST data, auth and more. Basic Auth Header Generator Generate HTTP Basic Authentication headers online — encode username:password to Base64 Authorization header instantly WiFi QR Code Generator Generate WiFi QR codes for instant network sharing. Enter SSID, password, encryption type. Scan to connect on iOS & Android. Free, no signup, 100% browser-based. IPv4 Subnet Calculator Free online IPv4 subnet calculator. Enter an IP and CIDR to instantly get the network address, broadcast address, subnet mask, wildcard mask, host range and host count. Supports subnet division. WebSocket Tester Free online WebSocket tester. Connect to any ws:// or wss:// endpoint, send messages, inspect frames with timestamps and sizes, auto-send on an interval and save message templates. 100% local.

Reference

File Hash Checker Calculate and verify MD5, SHA-1, SHA-256, SHA-512 file hashes locally Chmod Calculator Free online chmod calculator to visualize and calculate Linux file permissions with checkboxes. Instantly convert between numeric (755, 644) and symbolic notation (rwxr-xr-x). Supports special permissions like setuid, setgid, sticky bit. ASCII Table Complete ASCII character encoding reference with decimal, hexadecimal, octal, binary codes, HTML entities, and character descriptions. Search and filter instantly. Hex Viewer View file contents in hex dump format with search, offset navigation, and virtual scrolling MIME Type Lookup Instantly find MIME types by file extension or look up extensions by MIME type. Free online reference with 1000+ entries. Screen Resolution Checker Detect screen resolution, viewport size, DPI, color depth and display info in real time. Browser Info Instantly detect browser name, version, rendering engine, OS, screen resolution, language, and all capabilities online. MAC Address Lookup Look up the vendor of any MAC address against the built-in IEEE OUI database, normalize every input format, inspect the I/G and U/L flag bits and derive the EUI-64 link-local address — with a random locally administered MAC generator, all offline. HTTP Status Codes Complete reference of HTTP status codes with descriptions. Search and filter by code, category, or keyword. SQLite Online Run SQLite queries in your browser. Open .db/.sqlite/.sqlite3 files or create an in-memory database, run multi-statement SQL, export results as CSV or JSON. Docker Run to Compose Convert docker run commands to docker-compose.yml online and turn compose files back into docker run commands. Free converter that runs in your browser. Mermaid Editor Create flowcharts, sequence diagrams, Gantt charts and more from text with the Mermaid live editor. 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