Why InstaHasher

Browser-side via Web Crypto API

Hashes are computed in your browser using the standard Web Crypto API. The text or file you input never leaves your machine.

Free, no signup, no ads

No account, no email, no popups.

File hashing without upload

You can hash files of arbitrary size (limited only by your browser's memory). The file is read locally and streamed through the Web Crypto API. Nothing is uploaded.

EU operator, EU hosting

• Operator: Dynamic Foundries, French SASU (RCS Paris 102 801 206)
• Hosting: OVH Gravelines, France

What we don't claim

• We don't claim faster-than-native hashing. We use the browser's

Web Crypto API; the browser is the limit.

What we do claim

• Free, no signup, no ads
• Browser-side via Web Crypto API
• MD5, SHA-1, SHA-256, SHA-384, SHA-512, HMAC
• File hashing without upload
• EU operator and hosting

Last updated: 2026-05-18.