More free calculator tools
Same quality bar. Still free. Still no upload.
Part of free X tools, free LinkedIn tools and 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. Enter bitrate and length
Video and audio bitrate in kbps, plus the duration in minutes and seconds.
2. Read the size
The estimate updates as you type: total kbps times seconds, divided by 8.
3. Work back from a cap
Enter a target size in MB to see the video bitrate that fits.
Questions
Does audio count toward the file size?
Yes, and it is easy to forget. Total bitrate is video plus audio, so a 128 kbps audio track on a 10-minute video adds roughly 9 MB on its own. The calculator takes both so the estimate is the whole file rather than the video stream.
Why is my real export different from the estimate?
Because most encoders are variable-bitrate: they spend more on complex motion and less on static frames, so the average lands near your target rather than exactly on it. Container overhead adds a little too. Treat the figure as accurate within a few percent, and leave headroom against a hard cap.
Can it tell me the bitrate for a size limit?
Yes. Enter a target in MB and it shows the video bitrate that fits once your audio bitrate is set aside. Leave some headroom under a hard cap, because encoders average around a target rather than hitting it exactly.
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.