Hash
Get the SHA-256 digest of any text as you type — fast, secure, and computed locally.
Hashing runs locally via your browser's Web Crypto API. Nothing is uploaded, logged, or stored.
SHA-256 is the workhorse of modern security: it produces a 256-bit digest, is currently collision-resistant, and powers TLS certificates, Git commit IDs, blockchain proofs, and content integrity checks. This tool uses the browser's native Web Crypto implementation — the same audited code your browser uses for HTTPS.
Need to check whether a string is a valid SHA-256 digest? Use this regex:^[a-fA-F0-9]{64}$— a SHA-256 hash is always exactly 64 hexadecimal characters. For lowercase-only output use^[0-9a-f]{64}$, for uppercase-only use^[0-9A-F]{64}$. You can try it live in the Regex Tester.
Need a longer digest? Use SHA-512. Hashing a password for storage? Use a slow KDF like bcrypt instead, and for keyed messages see the HMAC Generator.
Compare the digest of pasted release notes or manifests against published checksums.
Hash payloads to create stable identifiers that change if even one character changes.
Check user input or stored values with ^[a-fA-F0-9]{64}$ — exactly 64 hex characters means a well-formed SHA-256 digest, in JavaScript, Python, Java or any regex engine.
^[a-fA-F0-9]{64}$ — start and end anchors plus exactly 64 hexadecimal characters. For example in JavaScript:const isSha256 = (s) => /^[a-fA-F0-9]{64}$/.test(s);Note this only checks the format; it cannot confirm the hash matches a specific input — for that, hash the input again and compare.Compute the MD5 digest of any text instantly, in your browser. Hex output with uppercase toggle.
Compute SHA-512 digests locally with WebCrypto — 512-bit output as hex.
Calculate the CRC32 checksum of text in hex and decimal — the classic integrity check.
Describe what you want to match and get a working regular expression with explanations and examples.
Looking for something else? Browse all tools