Subtitle Format Converter
Convert subtitles between SRT, WebVTT, and ASS/SSA formats in your browser. Auto-detects input, preserves timing and text, free and private. No upload required.
Loading tool...
What is Subtitle Format Converter?
The Subtitle Format Converter converts subtitle files between SRT (SubRip), WebVTT, and ASS/SSA (Advanced SubStation Alpha) — the three most widely used subtitle formats. It auto-detects the input format, preserves cue timing to the millisecond, and outputs clean text suitable for any video player, streaming platform, or editing tool. Everything runs in your browser.
Key Benefits
- Three-way conversion: SRT to WebVTT, ASS to SRT, WebVTT to ASS, and more
- Auto-detects the input format — just paste and convert
- Millisecond-accurate timing and line-break preservation
- Strips ASS override and VTT inline tags for clean output
- 100% client-side — no uploads, no servers
Common Use Cases
- •Convert SRT subtitles to WebVTT for HTML5 video and streaming platforms
- •Turn ASS/SSA karaoke or anime subtitles into plain SRT for universal players
- •Prepare WebVTT captions for accessibility compliance (WCAG) from an SRT master
- •Migrate subtitle libraries between video editing tools that expect different formats
How to Use the Subtitle Format Converter
- Paste your subtitles: Paste SRT, WebVTT (.vtt), or ASS/SSA subtitle content into the input box. The format is detected automatically.
- Pick a target format: Click SRT, WebVTT, or ASS to choose the output format. The source format button is marked and disabled.
- Review the output: The converted subtitles appear instantly in the output box, with cue count and detected format shown above.
- Copy or download: Click Copy to copy the result to your clipboard, or Download to save it as a .srt, .vtt, or .ass file.
Key Features
- Three-way conversion between SRT, WebVTT, and ASS/SSA with one click
- Automatic input format detection by content inspection — no need to specify the source format
- Millisecond-accurate timing preserved across every conversion, including cue order
- ASS override tags and inline VTT styling tags are stripped for clean, readable text output
- Download converted files directly with the correct .srt, .vtt, or .ass extension
- 100% client-side — no subtitle data is uploaded to any server