🔒 File Hash Generator
Generate SHA-256, SHA-1, or SHA-512 checksums for any text or file to verify integrity and spot tampering. Hashing happens in your browser — nothing is uploaded to a server.
🔐 Compute a Hash
🔒 Hashing happens entirely in your browser via the Web Crypto API. Your text and files are never uploaded, transmitted, or stored on a server.
What is this File Hash Generator?
It produces a cryptographic hash — a unique fixed-length fingerprint — of whatever text or file you give it. Because any change to the input, however tiny, produces a completely different hash, a checksum is the standard way to confirm data has arrived intact and untampered.
All of the work runs locally through your browser's Web Crypto API, so even large files stay on your device. Use it to verify software downloads against a vendor's published checksum, or to detect whether a file has changed.
❓ Frequently Asked Questions
What is a file hash and why would I compute one?
A hash (or checksum) is a fixed-length fingerprint of data. Change a single bit of the input and the hash changes completely. You compute one to verify a download arrived intact, to confirm a file has not been tampered with, or to compare a file against a known-good value published by a vendor.
Is my file uploaded anywhere?
No. Hashing is performed locally in your browser using the built-in Web Crypto API (crypto.subtle.digest). Your text and files never leave your device — nothing is uploaded, transmitted, logged, or stored on any server.
Which algorithm should I use?
Use SHA-256 for almost everything — it is the modern standard for integrity checks. Use SHA-512 when you want an even longer digest. SHA-1 is offered only to verify against legacy checksums; it is cryptographically broken and should not be relied on for security.
How do I verify a download with this?
Find the checksum the vendor publishes next to the download (they will state which algorithm). Hash your downloaded file here with the same algorithm and compare the two strings. If they match exactly, the file is intact; if they differ, the file is corrupted or has been altered — do not run it.