A small collection of browser tools for everyday tasks, built and maintained by one person.
Everything runs locally
No file you open here is transmitted anywhere. The site is static; the work happens in your browser. That's what makes the tools fast and unlimited — there's no bandwidth cost to ration.
What the site measures
That promise covers your files. The page itself does send anonymous usage counts to PostHog, a product analytics service, on their US servers: which tool ran, whether a check passed or failed, which rules failed, file sizes rounded into buckets like 1–4 MB. Filenames, file contents, image data and EXIF are never part of it — they stay in the tab with the file. It is cookieless and nothing is written to your device, which is why there is no consent banner to dismiss. The privacy policy lists every field.
Marketplace specs
Image rules for Amazon, Etsy, eBay, Walmart and the rest live in one versioned file with a source and verification date per entry. One change updates every tool that uses it.
Amazon's official documentation sits behind a Seller Central login, and published third-party guides disagree on some numbers. Where they conflict, the permissive value is the hard failure and the stricter one is a warning. A false failure costs you an afternoon; a false pass costs you a suppressed listing.
What the tools won't claim
Watermarks, props and logo ownership can't be judged from pixels. Those rules are marked unknown and listed for you to check, not reported as passing.
Contact
Wrong specs get fixed first — a bad number here produces wrong answers for everyone. See the contact page.