Hash Generator — Free Online Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
All processing happens locally. No data is sent to any server.
Hashing is a one-way cryptographic function that converts data into a fixed-size string. It's essential for password storage, data integrity verification, digital signatures, and more. Our Hash Generator computes MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input. Select which algorithms you need and click Generate to see all results at once. You can also enable HMAC mode to sign your data with a secret key — useful for API authentication and message verification where you need to prove data integrity and authenticity. MD5 and SHA-1 are faster but less secure — use them for checksums, not security. SHA-256 and SHA-512 are recommended for cryptographic purposes like password hashing and digital signatures. The tool displays all hash outputs simultaneously so you can compare algorithms side by side. You can copy any hash with a single click, making it easy to use in your code, configuration files, or security documentation. All hashing happens in your browser using the Web Crypto API — your data never leaves your device. This makes it safe to use with sensitive passwords, API keys, or confidential data that needs integrity verification. For related generation tasks, try our [UUID Generator](/tools/uuid-generator) for unique identifiers, or use our [Base64 Encoder/Decoder](/tools/base64) to encode binary hash outputs.
FAQ
What is a hash?
A hash is a fixed-length string produced by a mathematical function that takes input data of any size. Hashing is one-way, meaning you can't reverse a hash to get the original data.
Which algorithm should I use?
For security purposes (passwords, signatures), use SHA-256 or SHA-512. For checksums and non-security applications, MD5 or SHA-1 are fine.
Are hashes reversible?
No. Hashing is a one-way function. You cannot reverse a hash to get the original input. This is why hashes are used for password storage.
Is my data safe?
Yes. All hashing happens in your browser using the Web Crypto API. Your data never leaves your device.