Why won't this file upload?
Pick where the file is going, drop it in, and see every requirement it passes or fails — in plain language, with a one-click fix and a receipt that proves the result. The whole check runs in your browser.
- YouTube thumbnail · rules v2, verified 2026-08-02YouTube Help — Add video thumbnails
- LinkedIn document post · rules v2, verified 2026-08-02LinkedIn Help — Upload and share documents on LinkedIn
Platforms change their limits. Every profile shows the date a human last verified it against the official documentation — if the date looks stale, trust the platform's page over ours.
The receipt records the file's measured facts before and after fixing, every processing step, each rule's outcome, and SHA-256 fingerprints — plus the exact rule version and sources used. It only ever asserts what was actually observed in your browser; checks that couldn't run are marked unverified, never passed.
Want chained workflows on whole folders? The same fixes are available as Recipes and verified Morfs.