File Checksum Verifier
Calculate and verify MD5, SHA-1, SHA-256 and SHA-512 checksums for any file. Compare against a known hash to verify integrity. Free, runs in your browser.
🔒 Security Tools
Free
Browser-based
What is a File Checksum?
A checksum (or hash) is a fixed-length fingerprint computed from a file's contents. Even a single changed byte produces a completely different hash. Software publishers provide checksums so you can confirm a downloaded file is authentic and was not corrupted or tampered with in transit.
Hash Algorithm Comparison
| Algorithm | Output length | Security | Common use |
|---|---|---|---|
| MD5 | 128-bit (32 hex) | Deprecated for security | Legacy checksums, quick integrity |
| SHA-1 | 160-bit (40 hex) | Deprecated for security | Git commits, legacy systems |
| SHA-256 | 256-bit (64 hex) | Secure | File integrity, code signing |
| SHA-512 | 512-bit (128 hex) | Very secure | High-security file verification |
Tips
Always prefer SHA-256 or SHA-512 for verifying downloaded files. MD5 and SHA-1 are broken for cryptographic purposes but still useful for detecting accidental corruption. Your file is read entirely in the browser using the Web Crypto API — nothing leaves your device.