More free subtitle tools
Same quality bar. Still free. Still no upload.
Part of free YouTube 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 a chapter-friendly SRT
Cues that mark section starts.
2. Build YouTube chapters
Timestamps formatted for description paste.
3. Copy into YouTube
Paste under the video description.
Questions
Why must the first line be 0:00?
YouTube rejects chapter lists that do not start at the beginning of the video. This tool always writes 0:00 for the first chapter title.
How are titles chosen?
From the cue text at each chapter start (first non-empty line, markup stripped). Edit the output before you paste if a cue is not a good heading.
What do the three modes do?
Gap starts a new chapter wherever the silence between cues is at least the seconds you set (4 by default). Every N seconds adds one at a fixed interval of 30 seconds or more. Markers starts one at any cue that begins with Chapter, Part, Section, Scene or Act, or a # heading. It warns you below three chapters, the minimum YouTube needs.
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.