Hash Value Generator
Convert strings with MD5/SHA1/SHA256 and other algorithms to generate hash values all at once
Features
Generate 6 types of hashes at once
Supports batch conversion from MD5 to SHA-512
Generate HMAC authentication codes
Specify a secret key to also compute the message authentication code
Batch conversion line by line
Hash multiple lines together, one line at a time
Processing completed within the browser
Fast and secure computation with the Web Crypto API
How to use
Enter text
Paste or enter the string you want to hash into the input field
Select an algorithm
Specify batch generation or an individual method such as MD5 or SHA-256 from the dropdown
Set options
Optionally toggle one hash per line, or enter a secret key for HMAC
Generate and check the result
Press the generate button and get the displayed hash values with the copy button
Use cases
Checking file integrity
Detect tampering of distributed data or download corruption by comparing hashes
Generating stored values for passwords
Use it for a scheme that verifies against a hashed value without storing plaintext
Verifying API signature behavior
Reproduce a signature generated with HMAC on your end to verify request validation
Detecting duplicate data
Compare string hashes to quickly determine whether the content is identical
Fundamentals
What is a Hash Value?
A hash value is a fixed-length value created from data through a specific calculation. The same input always produces the same hash value, and changing even a single character in the input produces a completely different value. It is virtually impossible to reverse-engineer the original data from the hash value.
Differences Between MD5 and SHA-256
- MD5：MD5 is an older hash function that outputs a 32-digit hexadecimal string. It is fast, but methods for creating collisions have been discovered, making it not recommended for security purposes.
- SHA-256：SHA-256 is the current standard hash function that outputs a 64-digit hexadecimal string. It is widely used for digital signatures and file integrity verification (bcrypt or similar dedicated methods are used for password storage).
What is HMAC?
HMAC is a hash calculated by combining a secret key. Beyond detecting data tampering, it can also verify that the value was created by someone who knows the key, making it commonly used for API request signatures.
Safety and privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
computing hash values is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
input text and generated results and input suggestions are not stored on the server.