Subtitle Converter
Free online subtitle converter. Convert SRT to VTT, VTT to SRT, ASS to SRT instantly. No upload, 100% private, browser-based processing.
What subtitle formats are supported?
This tool supports conversion between SRT (SubRip), VTT (WebVTT), and ASS (Advanced SubStation Alpha) subtitle formats. These are the most widely used subtitle formats for video playback, streaming, and professional editing.
Is my subtitle data safe and private?
Yes, absolutely. All processing is done locally in your browser using JavaScript. No subtitle data is ever sent to any server. Your files remain 100% private and secure.
How does automatic format detection work?
The tool analyzes file content markers to detect the format: WEBVTT header for VTT files, Dialogue: lines for ASS files, or sequential numbering with timestamps for SRT files. This allows you to load any subtitle file without manually selecting the format.
Will formatting and styling be preserved during conversion?
Basic subtitle timing and text content are always preserved. However, advanced styling in ASS (custom fonts, colors, positioning, effects) may be simplified when converting to SRT or VTT, as these formats have limited styling capabilities. VTT supports basic styling like bold and italic.
What is the difference between SRT, VTT, and ASS formats?
SRT is the simplest format, widely compatible with most video players. VTT (WebVTT) is designed for web use and supports basic styling, used by HTML5 video players. ASS is the most advanced, supporting complex styling, positioning, and effects, commonly used in anime fansubbing and professional subtitling.
Can I convert multiple subtitle files at once?
Yes, the tool supports batch conversion. You can load multiple subtitle files and convert them all at once to your desired format, saving time when working with large subtitle collections.
Why convert subtitles to WebVTT format?
WebVTT is the standard format for HTML5 video players and web streaming. It's natively supported by modern browsers, supports basic styling, and works seamlessly with video.js, Plyr, and other web video players.
Can I edit subtitles before converting?
Yes, you can preview and edit subtitle text, timing, and sequence before conversion. This is useful for fixing typos, adjusting timing sync, or removing unwanted lines.
What is ASS format used for?
ASS (Advanced SubStation Alpha) is used for complex subtitle styling with custom fonts, colors, positioning, and effects. It's popular in anime fansubbing, karaoke subtitles, and professional subtitling where precise visual control is needed.
Does the tool handle different character encodings?
Yes, the tool automatically detects and handles UTF-8 and other common encodings. This ensures proper display of subtitles in any language, including Chinese, Japanese, Arabic, and other non-Latin scripts.
Is there a file size limit?
Since all processing happens in your browser, the limit depends on your device's memory. Typical subtitle files (under 10MB) are processed instantly. Very large files may take longer but will still work.
Can I use this tool offline?
Yes, once the page is loaded, you can convert subtitles without an internet connection. All processing is done locally in your browser.
How to Use Subtitle Converter
Subtitle Converter turns subtitle text between SRT, VTT and ASS formats directly in your browser. Nothing is uploaded — parsing and rewriting happen locally.
- Paste your subtitle content into the box labeled “Paste subtitle text here...”, or drop the .srt/.vtt/.ass file onto it.
- Open the “Output format” selector and choose SRT, VTT or ASS as the target format.
- The conversion runs instantly and appears in the box labeled “Converted result will appear here...”.
- Review a few timing lines, then copy the result or download it with the right subtitle extension.
VTT starts with a WEBVTT header and uses a dot before milliseconds while SRT uses a comma — the converter handles this, but check the first lines after converting.
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