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Calculate file SHA hash values to verify integrity and security. Supports SHA-1, SHA-256, and SHA-512 algorithms.
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HMAC-SHA Calculator
Securely calculate message authentication codes (MAC). Supports SHA256, SHA512, and other algorithms to verify data integrity and sender identity.
SHA Hash Calculator
Online hash generator and verification tool supporting SHA1, SHA256, and SHA512 algorithms, featuring advanced salting and multi-round iteration options.
Keccak Hash Calculator
Online hash tool supporting Keccak-224, 256, 384, and 512 algorithms. Features custom salt, iterations, and multiple input/output formats.
When you download an important file, how do you know it hasn't been tampered with? A file SHA hash checker calculates a unique digital fingerprint (hash value) for your file, allowing you to easily verify its integrity and authenticity. SHA (Secure Hash Algorithm) is a family of cryptographic hash functions that converts files of any size into a fixed-length string (40 characters for SHA-1, 64 characters for SHA-256, and 128 characters for SHA-512). Even if a file is altered by just a single bit, the resulting hash value will be completely different.
What is the difference between SHA-1 and SHA-256?
SHA-1 generates a 160-bit hash (40 characters) and has known collision vulnerabilities. SHA-256 generates a 256-bit hash (64 characters) and is currently much more secure.
Why doesn't my calculated hash match the official website?
First, ensure you are using the same algorithm (e.g., both using SHA-256). Second, check if the file was downloaded completely. Finally, verify that the official hash value comes from a trusted source.
For highly sensitive files, we recommend using local offline verification tools. Large files (over 2GB) may fail due to browser memory limits. If the verification result does not match, please redownload the file and ensure the correct algorithm is selected.
When releasing software, developers are advised to provide both SHA-256 and SHA-512 hash values. A typical verification scenario: After downloading a Linux ISO image, run sha256sum filename.iso and compare it with the value provided on the official website. Note that Windows line endings (CRLF) and Linux line endings (LF) will result in different hash values.
