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Calculate file SHA hash values, verify integrity and security, support SHA-1/256/512 algorithms
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Max 100 MB
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When downloading important files, how can you confirm they haven't been tampered with? File SHA checksum verification allows you to easily verify file integrity and authenticity by calculating a unique digital fingerprint (hash value) for your files. SHA (Secure Hash Algorithm) is a set of cryptographic hash functions that convert files of any size into fixed-length strings (SHA-1 produces 40 characters, SHA-256 produces 64 characters, SHA-512 produces 128 characters). Even if a file changes by just 1 bit, the hash value will be completely different.
What's the difference between SHA-1 and SHA-256?
SHA-1 generates 160-bit hashes (40 characters) and has known collision vulnerabilities; SHA-256 generates 256-bit hashes (64 characters) and is currently more secure.
Why doesn't my calculated hash value match the official website's?
First, confirm that the algorithms are the same (e.g., both using SHA-256), second, check if the file was completely downloaded, and finally confirm that the official website's hash value comes from a trusted source.
For sensitive files, it's recommended to use local verification tools; large files (over 2GB) may fail due to browser memory limitations; if verification results don't match, please re-download the file and confirm the algorithm selection is correct.
When releasing software, it's recommended to provide both SHA-256 and SHA-512 hash values simultaneously. Typical verification scenario: after downloading a Linux image file, run sha256sum filename.iso to compare 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.
