Hash Calculator is a purely frontend online hash computation tool supporting 13 mainstream hash algorithms. It supports text and file input, can compute multiple algorithms simultaneously, supports HMAC mode and multiple output formats. Uses WebAssembly for high-performance computation.
All processing done locally, data never leaves your browser
How to Use
1Choose input mode: text input or file upload
2Enter text or upload/drop a file
3Select the hash algorithms you need (multiple allowed)
4Choose output format: hex, HEX, Base64, or byte array
5Enable HMAC mode and enter a key if needed
6View results and click copy to copy
FAQ
What is a hash value?
A hash value is a fixed-length string produced by a hash algorithm from arbitrary-length data. It's a one-way function — you cannot reverse-engineer the original data from the hash.
What is HMAC?
HMAC (Hash-based Message Authentication Code) uses a hash function combined with a secret key to verify both the integrity and authenticity of a message. It's more secure than a plain hash.
What's the difference between these algorithms?
MD5 and SHA-1 are no longer recommended for security but are fine for checksums. SHA-256/384/512 are widely used secure algorithms. SHA-3 is the next-generation standard. CRC32 is used for data integrity checks. BLAKE2/BLAKE3 are high-performance modern algorithms.
Is my data sent to a server?
No. All hash computations are performed locally in your browser using WebAssembly. No data is transmitted over the network.
How large can files be?
There's no hard limit, but browser memory is the bottleneck. Files over 1GB may cause performance issues.