Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or files. Compare hashes and verify file integrity — all processed locally in your browser.
🔒 Your data never leaves your device — all hashing is done locally
100% secure
Your files are never shared
Ultra-fast
Processing in seconds
Privacy
Automatic deletion after 1h
How to use the Hash Generator
Enter text or upload a file
Type or paste text in the text tab, or upload a file using the file tab. All hash algorithms are calculated simultaneously in real time.
Copy the hash you need
Each algorithm displays its hash result with a copy button. Toggle between uppercase and lowercase hex output using the case toggle.
Verify integrity
Paste an expected hash in the comparison field to check if it matches any of the calculated hashes. A green checkmark confirms a match.
Hash Algorithm Comparison
| Algorithm | Output Size (bits) | Security | Common Usage |
|---|---|---|---|
| MD5 | 128 | Weak | Checksums, legacy systems |
| SHA-1 | 160 | Deprecated | Git commits, legacy certificates |
| SHA-256 | 256 | Strong | TLS, Bitcoin, digital signatures |
| SHA-384 | 384 | Strong | Government, high-security applications |
| SHA-512 | 512 | Strong | Cryptography, file integrity |
What is Hashing?
Hashing is the process of converting data of any size into a fixed-size string of characters using a mathematical function. The output, called a hash or digest, acts as a unique fingerprint for the input data.
Hash functions have several important properties: they are deterministic (same input always gives same output), fast to compute, and produce a fixed-size output regardless of input size.
Cryptographic hash functions add security properties: it should be infeasible to find two different inputs that produce the same hash (collision resistance) or to reconstruct the input from the hash (pre-image resistance).
Verifying File Integrity
When downloading software or important files, publishers often provide a hash value (usually SHA-256) alongside the download. After downloading, you can compute the file's hash and compare it to the published value.
If the hashes match, the file is identical to what the publisher intended. If they differ, the file may have been corrupted during download or tampered with by a third party.
Privacy & Security
This hash generator runs entirely in your browser using the Web Crypto API. No data — text or files — is ever sent to a server. This makes it safe to use with sensitive documents and passwords.
Hash Generator — Frequently asked questions
What is a hash?
A hash is a fixed-size string of characters produced by a mathematical algorithm (hash function) from input data of any size. The same input always produces the same hash, but even a tiny change in the input produces a completely different hash.
What is the difference between MD5 and SHA-256?
MD5 produces a 128-bit (32-character) hash and is fast but cryptographically broken. SHA-256 produces a 256-bit (64-character) hash and is currently considered secure. SHA-256 is recommended for security-sensitive applications.
Is MD5 still secure?
No. MD5 has known collision vulnerabilities, meaning two different inputs can produce the same hash. It should not be used for security purposes like password hashing or digital signatures. However, it's still useful for checksums and non-security file verification.
How do I verify a file's hash?
Upload your file using the file input tab, then compare the calculated hash with the expected hash provided by the file's publisher. If they match, the file has not been modified or corrupted during download.
What is SHA-256 used for?
SHA-256 is widely used in TLS/SSL certificates, Bitcoin and cryptocurrency mining, digital signatures, password hashing, and data integrity verification. It's part of the SHA-2 family designed by the NSA.
Can you reverse a hash?
No. Cryptographic hash functions are designed to be one-way: you cannot recover the original input from the hash output. This is a fundamental property called 'pre-image resistance'.
Why do hashes change completely with small changes?
This is called the 'avalanche effect' — a desirable property of hash functions. Even changing a single character in the input completely changes the output hash, making it impossible to predict the hash without computing it.
Is my data sent to a server?
No. All hash calculations are performed entirely in your browser using the Web Crypto API and JavaScript. No text or files are ever uploaded or transmitted.