CRC32 Checksum Calculator
Calculate the CRC32 checksum of text in hex and decimal. Free and private: runs in your browser.
Type or paste text to get its CRC32 (IEEE 802.3) checksum, the one used by ZIP, PNG and Ethernet.
Hashing runs locally in your browser. Your input never leaves this page.
Use cases
- Verify a download or file checksum.
- Create test fixtures for authentication code.
- Debug a hash mismatch between two systems.
Frequently asked questions
Can CRC32 detect tampering?
No. CRC32 detects accidental corruption, but anyone can craft data with a chosen CRC. Use SHA-256 or an HMAC for integrity against attackers.
Is the CRC32 Checksum Calculator free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
Is hashing the same as encryption?
No. A hash is one-way: you cannot get the input back. Encryption is reversible with a key. Use slow password hashes (bcrypt, Argon2, PBKDF2) for passwords and fast hashes (SHA-256) for integrity checks.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.