More subtitles tools
SRT to VTT Converter
SubRip to WebVTT, with the timestamp and header differences handled.
VTT to SRT Converter
WebVTT to SubRip, stripping the cue settings SRT can't carry.
Subtitle Timing Shifter
Nudge every cue forward or back to resync after an edit.
SRT from Text
Turn a script into a timed .srt at a chosen WPM.
Subtitle Reading-Speed Checker
Characters-per-second per cue against reading-speed norms — too-fast cues flagged.
Subtitle Speaker Label Editor
Batch add, rename or strip SPEAKER: prefixes across a whole file.
SRT Merger
Join two subtitle tracks into one, with the second shifted to continue after the first.
SRT Splitter
Cut one subtitle file into two at a timestamp, rebasing the second file's timing.
Subtitle Gap & Overlap Finder
Finds overlapping or too-close cues; reports them without touching your timing.
Subtitle Encoding Checker
Flags control characters, stray Unicode and encoding damage that break on some players.
Your files never leave your device
This is not a promise about how carefully we handle your upload. There is no upload. The file you choose is read into memory by your own browser, processed there, and handed back as a download — the tool has no server component and makes no network request with your data.
- Nothing is stored. We never receive the file, so there is no copy to retain, no retention period to disclose, and nothing to delete on request.
- Nothing is transmitted. No upload endpoint, no analytics payload carrying file contents, no third-party processor.
- You can verify it. Load this page, disconnect from the internet, and use the tool. It still works, because everything it needs is already on your machine.
- Nothing persists after you close the tab. Files are held in page memory only — not in local storage, not in a cache, not in a database.
A note on wording, because it matters: we do not describe these tools as “encrypted.” Encryption protects data that travels to somebody else's computer. Your file does not travel, so there is nothing to encrypt and nothing to intercept — which is a stronger guarantee than encryption, not a weaker one. The page itself is served over HTTPS like the rest of the site.
This makes the tools safe for material you are contractually barred from uploading to third-party services — client footage under NDA, unreleased campaign assets, anything covered by a confidentiality clause.
Questions
Why 42 characters and not some other number?
42 is a widely used target for Latin-script subtitles — roughly what fits on one line at a legible size across common video widths without crowding the safe area, and the default several major platforms build their own guidance around. It is a target, not a technical limit any file format enforces, which is why CJK-script guidelines commonly use a much lower per-line count instead and the limit here is adjustable rather than fixed.
It flagged a cue that looks fine on my screen.
Character count is a proxy for width, not a pixel measurement of one specific font and player. A narrow-lettered font at a given size fits more of this limit than a wide one, so the count is deliberately font-agnostic rather than tuned to any one renderer. Treat a flagged line as worth a look, not as definitely broken.
Do my files get uploaded anywhere?
No. This tool runs entirely in your browser using the Canvas and File APIs. The file you choose is read into memory on your own machine, processed there, and offered back as a download. Nothing is sent to a server, which is also why it keeps working with your network off.
Is it actually free, or is there a catch?
Actually free, with no account and no limit, because it costs nothing to run — the work happens on your device rather than on our hardware. That is different from generating with an AI model on Versely, which does cost credits; there is no free tier for generation.
These rearrange files. Versely makes new ones.
Everything on this page works on a file you already have, which is why it costs nothing. Generating something that did not exist — video from a prompt, a voice, a score — runs a model, and that costs credits.