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About this tool
Convert SubRip (.srt) subtitles to WebVTT in the browser, with timing offset, alignment tags and encoding fixes.
The SRT to VTT Converter rewrites a SubRip subtitle file as a W3C WebVTT file that the HTML5 <track> element will accept. It adds the mandatory WEBVTT header, changes the millisecond separator from a comma to a full stop, escapes stray ampersands and angle brackets in the cue text, drops legacy SubRip X1/Y1 coordinates, and can translate SubStation {\anN} alignment overrides into WebVTT line and align cue settings. Conversion happens entirely in your browser, so the subtitle file is never uploaded.
Open SRT To VTT Converter on AltFTool — it loads instantly in your browser.
Paste or upload your source content.
Choose the target format or conversion mode.
Copy or download the converted result.
Emits the WEBVTT header, full-stop timestamps and escaped cue text exactly as the W3C spec requires.
Parsing and conversion run in JavaScript on your device, so client footage stays private.
A millisecond offset is applied to every cue in one pass, with negative values clamped at zero.
The main difference is the timestamp separator and the header: SubRip writes 00:00:01,000 with a comma and has no header, while WebVTT writes 00:00:01.000 with a full stop and must begin with the line WEBVTT. WebVTT also supports cue settings for position and alignment, CSS styling through ::cue, and cue identifiers, none of which SubRip has.
Browsers only accept WebVTT in the <track> element — SubRip is not a supported track format in any major browser. Convert the file to .vtt, serve it with the text/vtt MIME type, and make sure it is on the same origin or sent with permissive CORS headers.
Bold, italic and underline tags carry across unchanged because WebVTT supports <b>, <i> and <u>. What is lost is <font color> styling and SubRip's X1/X2/Y1/Y2 coordinates, since WebVTT handles colour through CSS ::cue rules and position through line, position and align cue settings instead.
Enter the drift in milliseconds in the timing offset field — a positive number delays every cue, a negative number pulls it earlier. Measure the gap on one clearly spoken line first; if the drift grows over the runtime rather than staying constant, the frame rate is mismatched and a flat offset will not fix it.
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