Free Aspect Ratio Calculator

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.