HashTools

Generate cryptographic SHA-256 or SHA-512 hashes from any text using the browser's Web Crypto API.

Compute SHA-1 digests for legacy systems and Git-style hashes, with a security warning for modern use.

Compute MD5 hashes for checksums and legacy systems, with optional uppercase output.

Generate HMAC-SHA256, HMAC-SHA512, or HMAC-MD5 with a secret key for webhook and API signatures.

Calculate CRC32 checksums in hex, signed decimal, and unsigned decimal form.

Paste an unknown hash and identify which algorithm likely produced it.

Encode and decode UTF-8 text to and from Base64 with a one-click swap to flip the result.

Percent-encode special characters for URLs, or decode an encoded string back to plain text.

Encrypt and decrypt text with AES-256-GCM and PBKDF2 key derivation in your browser.

Generate one or many random UUID v4 identifiers, with options for uppercase and dash-free output.

Decode and inspect JSON Web Tokens, view the header and payload, and check token expiry.

Check password strength in real time with entropy and crack-time estimates. Stays in your browser.

Hash and verify passwords with bcrypt — adjust the work factor and check existing hashes.

Generate a 2048-bit RSA key pair and encrypt or decrypt with RSA-OAEP (SHA-256).

Sign and verify messages with RSA-PSS, RSA PKCS#1 v1.5, ECDSA P-256, or ECDSA P-384.

Run an ECDH key exchange between Alice and Bob, with an optional man-in-the-middle demo.