File Hash Calculator - Verify File Integrity
Calculate file hashes and checksums online for free. Supports SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. Verify file integrity, detect tampering, and ensure secure downloads.
Calculate File Hash
Use Cases
- • Verify file integrity after download
- • Detect file tampering or corruption
- • Compare files without transferring them
- • Digital forensics and evidence verification
What is a File Hash?
A file hash (or checksum) is a unique fixed-size string generated from file contents using a cryptographic hash function. Even a tiny change in the file produces a completely different hash, making it perfect for verifying file integrity.
Common Use Cases
- Download Verification: Verify software downloads haven't been corrupted or tampered with
- File Integrity: Ensure files haven't changed during transfer or storage
- Duplicate Detection: Find duplicate files by comparing hashes
- Digital Forensics: Verify evidence integrity in legal proceedings
- Backup Verification: Confirm backup files match originals
Hash Algorithm Comparison
| Algorithm | Output Size | Security |
|---|---|---|
| SHA-1 | 160 bits | Deprecated |
| SHA-256 | 256 bits | Recommended |
| SHA-384 | 384 bits | High security |
| SHA-512 | 512 bits | Maximum security |