DevTools Logo

Checksum Calculator

Checksum Calculator

SHA-1 / SHA-256 / SHA-384 / SHA-512 — computed locally in your browser

File

The file stays on your device — only the checksum is calculated locally.

Sample file

Download sample file

The sample file SHA-256 should be:

26abf6c87fc6c38f9b64e7f29417a1555e5c7f80eb63150760c3ce254683c686
ℹ️ MD5 is not available — the browser Web Crypto API only supports SHA algorithms (SHA-1/256/384/512).

    Related guides

    Gzip, Deflate, and CompressionStream: Browser-Native Compression

    What RFC 1952 actually specifies, how gzip differs from zlib and deflate-raw, and how to use CompressionStream in modern browsers without any library.

    Related tools

    AES Encryption

    Encrypt and decrypt text with AES-GCM and a passphrase, fully in your browser. Uses PBKDF2 key derivation and the Web Crypto API — your data and keys never leave your device.

    Basic Auth Generator

    Generate an HTTP Basic Authentication header from a username and password. Produces the Authorization header and ready-to-use curl and fetch snippets. Runs fully client-side.

    Bcrypt Generator & Verifier

    Hash passwords with bcrypt and verify hashes — choose your cost factor (rounds 4–15), get a secure hash instantly, and check whether a password matches a hash. Runs entirely in your browser.

    BIP39 Mnemonic Generator

    Generate and validate BIP39 seed phrases locally for testing

    Client-Side File Encryptor

    Encrypt any file with AES-256-GCM and PBKDF2 directly in your browser — no uploads, no accounts, wrong passwords fail loudly.

    CORS Header Validator

    Validate Cross-Origin Resource Sharing headers for security compliance