Free subtitle tools that never upload your files
Subtitles are small text files, but they are often surprisingly sensitive — the captions for an unreleased film, a private interview transcript, a paying client’s course video. Almost every subtitle converter on the web asks you to upload that file to a server. Toolvy does not. Every tool here runs entirely inside your browser: your file is read into memory, transformed on your own device, and handed straight back to you. Nothing is transmitted, and you can prove it by watching your browser’s Network tab while you work.
The toolkit is built on one shared engine. Whatever you drop in — SubRip (.srt), WebVTT (.vtt), SubStation Alpha (.ass/.ssa), SubViewer (.sbv), MicroDVD (.sub), TTML/DFXP or an LRC lyric file — is parsed into a single common model of timed cues. From there it can be written back out to any other format, re-timed, renumbered, cleaned of styling tags, or audited against professional readability rules. Because everything passes through that common model, the converter is genuinely universal rather than a handful of one-way conversions bolted together.
Convert between any subtitle format
The most common jobs have dedicated pages — SRT to VTT for HTML5 web video, and VTT to SRT for VLC, editing software and YouTube. For anything else, the universal converter auto-detects the source format and writes whichever target you choose. Remember that converting to a richer format is lossless, while converting a styled ASS file down to SRT keeps the words and timing but drops the styling SRT cannot represent.
Fix timing, edit cues, and clean up
Out-of-sync captions are the most common subtitle complaint, and they are almost always off by a constant amount. The subtitle shifter moves every cue by the same offset to bring them back into line, while the subtitle editor lets you fix individual lines, retime a single cue, or add and delete captions in a simple table. When your captions are final, you can carry them across to the video tools and burn or mux them into the footage itself.