--- title: "Hash Comparison Tool" description: "Compare a file or text against a known hash to verify its integrity. Supports MD5, SHA-1, SHA-256, SHA-384 and SHA-512, and runs in your browser." url: https://findutils.com/security/hash-comparison-tool/ category: security --- # Hash Comparison Tool Compare a file or text against a known hash to verify its integrity. Supports MD5, SHA-1, SHA-256, SHA-384 and SHA-512, and runs in your browser. **Use this tool:** [Hash Comparison Tool](https://findutils.com/security/hash-comparison-tool/) ## Programmatic access - REST id `hash-comparison-tool`: POST https://api.findutils.com/api/tools/hash-comparison-tool/execute (reference: https://findutils.com/api/hash-comparison-tool/) - MCP tool `hash_comparison_tool` on https://mcp.findutils.com (reference: https://findutils.com/mcp/hash-comparison-tool/) ## Why Compare Hashes? Hash comparison verifies file integrity. Downloading files should be verified against provided checksums to ensure they haven't been corrupted or tampered with. ## Tips for Accurate Hash Comparison - Always use the same algorithm on both sides of the comparison. A SHA-256 hash will never match a SHA-512 hash, even for identical files. - Copy and paste hash values instead of typing them manually. A single mistyped character will cause a mismatch even when the file is perfectly intact. - Use SHA-256 or stronger for any security-sensitive verification. MD5 and SHA-1 have known collision vulnerabilities and should only be used for basic checksum purposes. - When verifying software downloads, get the expected hash only from the official publisher website. Third-party mirrors may provide altered hashes to match tampered files. - For very large files, allow extra time for the browser to process the entire file. The computation runs locally and may take several seconds for multi-gigabyte inputs. ## Frequently Asked Questions ### What is a hash? A hash is a fixed-size fingerprint of data. Any change to the data produces a completely different hash, making them ideal for integrity verification. ### Which algorithm should I use? SHA-256 is recommended for most purposes. MD5 and SHA-1 are considered weak for security but still useful for checksums. ### Is file hashing done locally? Yes, all hashing happens in your browser. Files are never uploaded to any server, ensuring privacy for sensitive documents. ### Can two different files have the same hash? This is called a collision. While theoretically possible, it's computationally infeasible with strong algorithms like SHA-256. ### What is the difference between MD5 and SHA-256? MD5 produces a 128-bit (32-character) hash and is fast but vulnerable to collision attacks. SHA-256 produces a 256-bit (64-character) hash and is currently considered secure for all practical verification and security purposes. ### Can I compare hashes of two different files? Yes. Compute the hash of the first file, copy the result, then compute the hash of the second file and paste the first hash into the expected value field. If both hashes match, the files are identical at the byte level. ### Does case matter when comparing hash values? No. Hash values are hexadecimal strings and this tool performs a case-insensitive comparison, so uppercase and lowercase representations of the same hash will correctly match. ### Is SHA-1 still safe to use? SHA-1 has known collision vulnerabilities and should not be used for security-critical applications like digital signatures or certificate validation. It remains acceptable for basic, non-adversarial checksum verification such as detecting accidental file corruption. ### How long does it take to hash a large file? Hashing speed depends on the file size and your device hardware. Most modern browsers can process roughly 200 to 500 MB per second using the Web Crypto API. A 1 GB file typically takes 2 to 5 seconds. ### What should I do if the hashes do not match? A mismatch means the data has changed. Re-download the file from the official source and compare again. If the mismatch persists, the source file may have been tampered with or the published hash may be incorrect. Do not install or execute files that fail hash verification. ## Related Tools - [File Hash Calculator](https://findutils.com/security/file-hash-calculator/) - [MD5 Hash Generator](https://findutils.com/security/md5-hash-generator/) - [HMAC Generator](https://findutils.com/security/hmac-generator/) - [Text Encryption](https://findutils.com/security/text-encryption/) - [Random Key Generator](https://findutils.com/security/random-key-generator/) - [Password Strength Checker](https://findutils.com/security/password-strength-checker/) - [JWT Decoder](https://findutils.com/developers/jwt-decoder/)