More free subtitle tools
Same quality bar. Still free. Still no upload.
Part of free YouTube tools and free LinkedIn tools.
Your files never leave your device
Free to use, with no account, no usage limit and no watermark, because the work runs on your device rather than on our servers.
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.
How it works
1. Drop an SRT or VTT
Timed captions stay in the browser.
2. Review CPS and timing
Spot cues that are too fast to read.
3. Fix and re-check
Edit timing elsewhere, then verify again.
Questions
What's a normal reading speed for captions?
There's no single number every platform enforces, but streaming guidelines commonly land between 17 and 20 characters per second for general adult content, lower for children's programming, and higher is sometimes accepted for fast-paced material a viewer can rewatch. The presets here reflect that range. pick the one closest to your audience.
How is this different from words-per-minute?
WPM measures how fast a script is spoken; this measures how long text actually sits on screen once it has been cut into cues. A perfectly-paced voiceover can still produce an unreadable cue if the cue-splitting crammed too much text into too short a timestamp. exactly what this catches, and a spoken-duration estimate cannot.
Can I set my own CPS limit?
Yes. Pick a preset (17 for kids or educational, 20 for general streaming, 25 for fast-paced) or drag the slider anywhere from 10 to 35 CPS. The CSV download lists every cue with its duration, characters, words and CPS.
Related tools
Stay in the same job cluster. Free tools stay on-device; paid tools are labelled as such.
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.