Tools in This Collection
Subtitle Format Conversion Workflow
The three main subtitle formats — SRT, VTT, and ASS — are used across different platforms and workflows. Converting between them is common when moving video content from one platform to another. All three conversion tools here run in your browser: paste your subtitle text or upload a file, convert, and download. No server involved.
SRT: The Universal Standard
SubRip (SRT) is the most widely supported subtitle format — accepted by video editing software, streaming platforms, media players, and social media. If you need a subtitle format that works everywhere, SRT is the safest choice. SRT timestamps use commas for milliseconds: 00:01:23,456.
VTT: The Web Standard
WebVTT (VTT) is the HTML5 video standard — required by browser video players and used natively by YouTube, Vimeo, and most web-based players. VTT timestamps use periods for milliseconds: 00:01:23.456. The SRT to VTT converter handles the timestamp format change and adds the required WEBVTT header automatically. Use the VTT to SRT converter when moving content to desktop players or editing software that expects SRT.
ASS: Advanced Styling
ASS/SSA (Advanced SubStation Alpha) supports features that SRT and VTT don't: per-line color styling, custom fonts, positioning, karaoke timing, and motion effects. ASS is used in anime fansubs and wherever subtitle styling beyond basic formatting is needed. The SRT to ASS converter converts your SRT content to ASS format, where you can then add advanced styling. All timing and text content is preserved in the conversion.
Frequently Asked Questions
What is the difference between SRT and VTT subtitle formats?
SRT (SubRip) and VTT (WebVTT) use nearly identical structures but differ in two ways: timestamp format (SRT uses commas for milliseconds, VTT uses periods) and file header (VTT requires a WEBVTT line at the start). HTML5 video and browser players require VTT; most video editing software and media players prefer SRT. Converting between them preserves all timing and text.
When should I use ASS subtitles instead of SRT?
Use ASS format when you need per-line color coding, custom font styling, karaoke timing effects, or precise positioning of individual subtitle lines. SRT only supports basic italic and bold formatting. ASS is common in anime fansubs where styling is part of the viewing experience, and in professional broadcast subtitles where color coding distinguishes speakers.
Will converting between subtitle formats affect the timing?
No. Format converters preserve all cue timestamps exactly. The conversion only changes the formatting syntax (timestamp separators, headers, cue identifiers) — not the actual timing values. A subtitle starting at 00:01:23,456 in SRT will start at 00:01:23.456 in VTT.