--- title: "SRT to VTT Converter — Free, Private, No Upload | Compress Pro" description: "Convert SRT subtitles to WebVTT for HTML5 video right in your browser — instant, private, nothing uploaded. ASS files convert too. Free, no accounts." canonical: https://compress-pro.com/srt-to-vtt --- # Convert SRT to VTT. > Subtitles converted on your device — instant & private. Convert SRT subtitles to WebVTT entirely in your browser — **the caption format HTML5 ``, YouTube and every modern web player expects**. Drop the files and the .vtt twins come straight back; ASS files convert the same way. Nothing is ever uploaded. **No uploads · No ads · Free & open source.** ## How it works 1. Drop files anywhere on the page, click to browse, or paste with Ctrl/⌘ + V. 2. Pick a quality or preset — or set an exact target size and let the tool find it. 3. Compress, compare before/after, and download — individually or as a ZIP. ## Why players want VTT Browsers only render WebVTT in a `` element — hand them an SRT and the captions simply never appear. The two formats are near twins: VTT adds a `WEBVTT` header, writes milliseconds with a dot instead of a comma, and drops the numeric counters. Small differences, but they are exactly what a strict parser rejects, which is why the conversion exists at all. ## What changes — and what stays Timing and text survive untouched: every cue keeps its start, end and lines. The header is added, commas become dots, counters go. ASS input works too — styling override tags are stripped and `\N` line breaks unfold, so heavily styled karaoke tracks flatten into plain readable captions. Need the opposite direction? [VTT to SRT](https://compress-pro.com/vtt-to-srt) is one click away. ## Under the hood The whole conversion is a few hundred lines of pure JavaScript running on your device — no WebAssembly engine, no server round-trip, which is why it is instant even for feature-length tracks. Files are parsed into cues, sorted, and rewritten in the target dialect; the text itself never leaves your browser. That matters for unreleased footage, court transcripts and anything else subtitles tend to spoil. ## Frequently asked questions ### Which input formats can I drop? SRT, VTT and ASS/SSA — the format is detected from the file’s content, not its extension, so mislabeled files convert fine too. ### Do formatting tags survive? Basic ones do — , and pass through. ASS styling overrides (colors, positioning, karaoke timing) are stripped, because SRT and most VTT players cannot render them anyway. ### Can I convert many files at once? Yes — drop a whole season. Each file converts independently and downloads on its own row, or grab everything as a ZIP. ### Are my subtitle files uploaded? No. The conversion is plain text processing that runs entirely in your browser — the server only delivers this page. Want proof? Run one file through, switch your connection off, and run another — it still works. ## Related tools - [Convert VTT to SRT](https://compress-pro.com/vtt-to-srt) - [Convert ASS to SRT](https://compress-pro.com/ass-to-srt) - [Compress videos](https://compress-pro.com/compress-video) --- Part of [Compress Pro](https://compress-pro.com/) — every tool page has a markdown twin at `.md`. Full tool index: [llms.txt](https://compress-pro.com/llms.txt)