We Can't See What You Paste — And That Was a Design Constraint, Not a Slogan

We can't see what you paste. No logging. No uploading. Just your browser.

That's not marketing copy I wrote after the fact — it's a description of how FormatStack is actually built. Every tool (JSON formatter, regex tester, UUID generator, Base64 encoder, cron parser) runs entirely client-side. When you paste something in, it never leaves the tab. There's no fetch(), no API route, no server that ever sees the payload — because there isn't a server in that request path at all.

I want to be precise about what that claim covers, because vague privacy claims are exactly what a dev audience should be skeptical of.

What "we can't see what you paste" actually means: The processing — parsing, formatting, encoding, whatever the tool does — happens in your browser's JS engine. Your input never becomes a network payload. That's an architectural fact, not a policy I could quietly change. There's no backend endpoint to add logging to even if I wanted to.

FormatStack is live at formatstack.tech.