Hash Generator - MD5 / SHA-256 Hash Calculator
Free online hash generator. Instantly compute MD5, SHA-1, SHA-256, SHA-512 hashes for text or files. No signup needed.
About This Tool
Hash Generator computes cryptographic hash digests for any text input using MD5, SHA-1, SHA-256, and SHA-512 algorithms. It displays all hash outputs simultaneously for easy comparison. Essential for developers verifying file integrity, generating checksums, or working with authentication systems that require hashed credentials.
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How It Works
Cryptographic hash functions are one-way mathematical algorithms that map arbitrary-length input to a fixed-length output (the digest). This tool leverages the Web Crypto API's `crypto.subtle.digest()` method, which runs native browser implementations of each algorithm.
MD5 produces a 128-bit (32 hex character) digest using four rounds of 16 operations each on 512-bit blocks. SHA-1 outputs 160 bits (40 hex chars) using 80 rounds on 512-bit blocks. SHA-256 generates a 256-bit (64 hex char) digest using 64 rounds of compression on 512-bit blocks with eight 32-bit working variables. SHA-512 produces a 512-bit (128 hex char) digest using 80 rounds on 1024-bit blocks with eight 64-bit working variables. All hashes exhibit the avalanche effect — changing a single input bit flips roughly half the output bits — making them suitable for integrity verification and digital signatures. Note: MD5 and SHA-1 are considered cryptographically broken for collision resistance and should not be used for security-critical applications.
How to Use
- 1Choose Text or File tab to select your input method.
- 2Enter text or upload a file to generate hash values.
- 3All four hash algorithms (MD5, SHA-1, SHA-256, SHA-512) compute simultaneously.
- 4Click Copy next to any hash value to copy it to your clipboard.
- 5Use the Compare section to verify two hash values match.
Frequently Asked Questions
What is a hash function?
A hash function takes input data of any size and produces a fixed-size output (hash value). The same input always produces the same hash, but it's practically impossible to reverse the process — you can't recover the original data from the hash.
Is MD5 still safe to use?
MD5 is no longer considered cryptographically secure due to known collision vulnerabilities. It's fine for checksums and non-security purposes, but use SHA-256 or SHA-512 for security-critical applications like password hashing.
What's the difference between SHA-256 and SHA-512?
SHA-256 produces a 256-bit (64-character hex) hash, while SHA-512 produces a 512-bit (128-character hex) hash. SHA-512 offers a larger security margin but is slightly slower. Both are considered secure for current applications.
Is my data safe?
Yes. All hashing is performed entirely in your browser using the Web Crypto API. No data is sent to any server. Your text and files never leave your device.
How do I verify file integrity with a hash?
Upload the file to generate its hash, then compare the result with the hash provided by the file's source. If they match, the file hasn't been tampered with.