Is my text data uploaded to a server?

No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Why is MD5 not offered?

The tool uses the browser’s native Web Crypto API, which implements the SHA family only. MD5 is broken for most purposes anyway — prefer SHA-256.

Is the hash computed over bytes or characters?

Over the UTF-8 bytes of your text, which matches what sha256sum and most languages produce for the same string.

100% local — your data never leaves your browser

SHA-256 Hash Generator — Free Online Hashing Tool

Compute SHA-256, SHA-1 or SHA-512 hashes of any text in your browser with Web Crypto. Free and private: your data never leaves your device.

Instant Private Zero cookies

Algorithm

Text input

Hash output

Why hash text in the browser?

Checksums, cache keys, deduplication and integrity checks all start with a hash. Paste any text above to get its hex digest instantly — without piping potentially sensitive content through an online service’s server.

How it works

The text is encoded as UTF-8 and digested with the browser’s native Web Crypto API (crypto.subtle.digest). Switch between SHA-256, SHA-1 and SHA-512 with the Algorithm option; the output is lowercase hexadecimal.

Frequently asked questions

Is my text data uploaded to a server?: No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Why is MD5 not offered?: The tool uses the browser’s native Web Crypto API, which implements the SHA family only. MD5 is broken for most purposes anyway — prefer SHA-256.
Is the hash computed over bytes or characters?: Over the UTF-8 bytes of your text, which matches what sha256sum and most languages produce for the same string.