Lightning-fast local processing powered by WebAssembly
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Why Use File Hashing?
Verify that a file hasn't been changed, corrupted, or tampered with using a hash. Compare the generated hash with the original to ensure file integrity.
Offline mode
Load all algorithms so you can use this tool without an internet connection
Select Hash Algorithm
Cryptographic Hash Functions
For security-sensitive applications and integrity verification
Legacy Cryptographic Functions
Broken: collision vulnerable
Non-cryptographic Hash
For checksums, deduplication and fast file verification - not for security
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Output
Algorithm
Hash
File
Verify/Compare Hash (Optional)
Size
Timestamp
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Use Cases
Verify Downloads
Compare hashes provided by software vendors.
Check File Integrity
Ensure files remain unchanged during transfer or storage.
Detect Corruption
Quickly identify damaged or incomplete files.
Deduplicate Files
Find identical files using fast hash algorithms.
Digital Forensics
Verify evidence files without modifying them.
Privacy
Is FastHash safe to use with sensitive files?
Yes. FastHash works 100% offline and locally in your browser. No data is ever sent to any server. You can even disconnect from the internet before using it. Everything runs directly on your device, making it safe for confidential or sensitive files.
FAQ
What is a file hash?
A file hash is a unique fingerprint generated from file contents. If even a single byte changes, the hash changes too.
Why should I verify file hashes?
Hash verification helps confirm that a file was downloaded correctly and hasn't been modified or corrupted.
Which algorithm should I use?
BLAKE3: Fastest modern choice.
SHA-256: Most widely supported.
SHA-512: Stronger output, slightly larger hash.
MD5 / SHA-1: Legacy compatibility only.
Are my files uploaded anywhere?
No. All hashing happens locally in your browser. Files never leave your device.
What is the difference between cryptographic and non-cryptographic hashes?
Cryptographic hashes are designed for security and integrity verification. Non-cryptographic hashes focus on speed and are commonly used for checksums and deduplication.
Can I hash multiple files at once?
Yes. FastHash supports selecting or dragging multiple files for batch processing.