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.
Caption Line-Length Checker
Flags lines over a readable character limit — worst offenders listed first.
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 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
How is this different from the timing shifter?
The timing shifter takes one file and nudges every cue by the same fixed amount to fix a sync problem. This tool takes two separate files and concatenates them into one, computing the second file's offset from the first file's own length rather than a number you have to work out yourself — a different job on a different input.
What if the two files are different formats — one SRT, one VTT?
Either is accepted for either slot; the output follows the first file's format. Cue timing and text carry over regardless of which format each source used, the same conversion this site's SRT/VTT converters do.
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.