Which subtitle formats are supported?

It reads SRT, VTT, SBV, LRC and ASS/SSA and detects the input format itself. It writes SRT, VTT, SBV, LRC, ASS or plain text.

Can I fix subtitles that are out of sync?

Yes. Shift every cue earlier or later by a number of seconds, or use an FPS preset to rescale timings made for a different frame rate.

Can I convert several subtitle files at once?

Yes. Drop several files and convert them all to one format; they download together as a ZIP. Files stay on your device.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

💬

Free Subtitle Converter

Convert subtitles between SRT, WebVTT, SBV, LRC, and ASS while preserving timing. Input format is auto-detected. Runs entirely in your browser.

File size depends on your deviceFiles stay privateNo login requiredFree forever

Drop files here, or click to browse

SRT, VTT, SBV, LRC, ASS, SSA, TXT · processed on your device

or press Ctrl+V to paste from your clipboard

You can drop multiple files at once

Browse files

Input format:

File encoding (reading)Download encodingWindows line endings (CRLF)

Shift (seconds)Speed factorFPS preset

Shift moves every cue by the given seconds (negative = earlier); the speed factor rescales all timestamps — use the FPS presets after a frame-rate change.

Merge a second language (bilingual subtitles)Choose second subtitle file…

Each cue of the second file is placed under the first-file cue it overlaps most in time. Timings come from the first file.

Subtitle text

Output

—

💡 Converts between SRT, WebVTT, SBV (YouTube), LRC (lyrics), and ASS/SSA, preserving timing. The input format is detected automatically. Everything runs in your browser — your captions are never uploaded.

Common uses

Convert SRT to VTTTurn an SRT subtitle file into WebVTT for HTML5 video.
Convert VTT to SRTTurn WebVTT captions into SRT for video players and editors.
Convert Subtitles for YouTube (SBV)Convert SRT or VTT captions to YouTube's SBV format.
Convert Subtitles to LRC LyricsTurn timed captions into an LRC lyrics file for music players.
Extract Plain Text from SubtitlesStrip timestamps from a subtitle file to get just the transcript.

How It Works

Different players and platforms want different subtitle formats — YouTube uses SBV, the web uses WebVTT, most video files use SRT. This converts between them while keeping the timing intact.

1
You paste or drop a subtitle file
SRT, VTT, SBV, LRC, or ASS/SSA. The input format is detected automatically — nothing is uploaded.
2
Cues are parsed into a common model
Each caption's start time, end time, and text are extracted, normalising the different timecode styles (commas, dots, centiseconds).
3
It's re-serialised to your target format
The cues are written out in the format you choose, with correct timecodes and structure for that format.
4
Copy or download
Grab the converted captions with the right file extension.

Captions can contain unreleased dialogue or sensitive transcripts. Everything is parsed and converted on your device — your subtitles never leave the browser.

Related Tools

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Subtitle Generator

Drop a video and get accurate captions as SRT or VTT, or burned into an MP4, in the original language or translated to English. Runs in your browser; nothing is uploaded.

Try it134 MB one-time download

💬

Subtitle Editor

Edit SRT/VTT subtitles in a table, preview them live over your video, and export.

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💬

Subtitle Extractor — MKV & MP4 to SRT

Extract the subtitle tracks inside an MKV, MP4, MOV, WebM or TS video as SRT, ASS or VTT files. Every language in one go, named so players find them. Runs in your browser; the video is not uploaded.