Privacy

Last updated: 2026-04-19. The short version is below. No dark patterns, no selling data, no third-party trackers.

TL;DR
Most conversions happen entirely in your browser — we never see the input. For the few converters that need server processing (audio, video, ebook, document), your file is stored in a temporary folder, processed, and deleted within 1 hour by an automated job. We don't make copies, don't inspect contents, and don't sell or share anything.

What we collect

Anonymous usage counts. Each converter has a view counter and a "real use" counter (fired after you actually interact with an input). Used to decide which converters to improve. Not tied to your identity.
IP address (temporarily). Used for rate limiting (30 requests/minute on the API, short windows on file uploads). Not persisted beyond the rate-limit window.
Standard web-server logs. URL, status code, timestamp, user agent. Retained per Rails defaults, used only for debugging.

What we don't collect

No accounts, no email addresses, no names.
No cross-site tracking cookies, no third-party analytics (no Google Analytics, no Facebook pixel, no Mixpanel).
No fingerprinting.

How files are handled

Converters in the Files category (audio, video, ebook, document formats) upload your file to our server because the conversion tools (FFmpeg, Calibre, pandoc) run there. Files are:

Stored in a per-conversion folder under tmp/conversions/<uuid>/.
Processed once. We don't open, read, or index the contents.
Deleted by a cron job that runs every 15 minutes and removes anything older than 1 hour.
Never sent to any third party.

All other converters (units, colors, code, cooking, sizing, text) do the math in your browser — your input never touches our server.

Cookies

We set two first-party cookies: a Rails session cookie and a CSRF-token cookie. Both are required for the app to work and expire when you close your browser. No advertising or tracking cookies.

Your rights

Because we don't store personally identifiable data, there's nothing tied to your identity to access, export, or delete. If you believe you've found a privacy issue, email us at [email protected].

Changes

If this policy changes materially, the "Last updated" date above will change and the new version will be live on this page before it takes effect.