Hash Generator (MD5 / SHA)
The problem: Verifying file integrity, storing passwords, generating API signatures and debugging authentication all require computing cryptographic hashes — which usually means installing a CLI tool.
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Hash Generator (MD5 / SHA): the complete guide
A hash generator computes cryptographic hash values from any text input using MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms — all within your browser using the native Web Crypto API, with no server involvement. Hash functions are one-way mathematical functions that produce a fixed-length digest from arbitrary input, used for file integrity verification, password storage (combined with salt), digital signatures, API authentication (HMAC), data deduplication, and blockchain operations. This tool makes all five standard hash algorithms accessible without installing OpenSSL or a command-line tool.
When to use which algorithm
MD5 (128-bit) is fast and useful for non-security checksums — file integrity checks where collision resistance is not required, cache keys, and comparing large files for equality. It should NOT be used for password hashing or any security-critical purpose, as MD5 collisions can be generated in seconds. SHA-1 (160-bit) is deprecated for security use but still appears in legacy systems and Git object IDs. SHA-256 and SHA-512 (256 and 512-bit respectively) are the current standards for security-critical hashing — API authentication, digital certificates, blockchain, and password hashing (though Argon2 or bcrypt are preferred for passwords). SHA-384 is the same as SHA-512 truncated to 384 bits, used in TLS 1.3 cipher suites.
Hash avalanche effect: why similar inputs produce completely different hashes
A fundamental property of cryptographic hash functions is the avalanche effect: changing even a single bit of the input completely changes the output hash. Try hashing 'password' and 'Password' — despite differing by only one character's case, the SHA-256 hashes are completely different 64-character strings. This property makes hashes useful for integrity verification: even a single character change in a file produces a completely different checksum, immediately detectable.
Step by step: how to use Hash Generator
- 1
Type or paste any text in the input field — all five hashes compute instantly.
- 2
Select a specific algorithm tab to focus on one hash, or view all five at once.
- 3
Click Copy next to any hash to copy it to your clipboard.
- 4
Use the 'Hash File' option to compute a checksum from an uploaded file (canvas-based).
- 5
Compare two texts by hashing both and checking if the hashes match.
- 6
Toggle between uppercase and lowercase hex output using the case button.
Security & privacy
SHA-1, SHA-256, SHA-384 and SHA-512 use the browser's native crypto.subtle.digest() — a C++ implementation running in the browser's secure context with hardware acceleration where available. MD5 uses a pure-JavaScript RFC 1321 implementation for compatibility (MD5 is not included in the Web Crypto API specification). No text or hash data is transmitted over the network. The tool is safe for use with sensitive strings such as API secrets or passwords (for debugging purposes).