File Checksum Verifier — No Upload
Upload a file and instantly calculate checksums across 6 algorithms — SHA-256, SHA-512, SHA-384, SHA-1, MD5, and CRC32. Paste an expected hash and the matching algorithm is automatically highlighted. Your file never leaves your device.
Verify a ChecksumWhat you get
- ✓Calculate SHA-256, SHA-512, SHA-384, SHA-1, MD5, CRC32 simultaneously
- ✓Auto-detect which algorithm matches your expected hash
- ✓Click any hash to copy it
- ✓File never leaves your browser
- ✓No file size restrictions
- ✓No signup or account needed
Frequently asked questions
How does auto-detect work?
Paste an expected hash before or after uploading a file. The tool calculates all 6 algorithms and highlights the one that matches. If none match, you'll see a clear warning.
Is my file uploaded to a server?
No. All checksum calculations happen in your browser using the Web Crypto API. Your file never leaves your device.
Which algorithm should I use?
SHA-256 is recommended for general use. SHA-512 for maximum security. MD5 and SHA-1 are included for compatibility but are considered insecure for cryptographic purposes. CRC32 is for error detection only.
Free · No account · No upload · Works offline