Generate cryptographic hashes online for free. Create MD5, SHA-1, SHA-256 or SHA-512 instantly for secure verification, data integrity, and checksum tasks.
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Browser local processing works best on Desktop for files over 100MB.
This tool uses the Web Crypto API's SubtleCrypto.digest() to compute cryptographic hashes client-side. MD5 and SHA-1 are broken for security (collision attacks exist), but still used for legacy checksums. SHA-256 is the current standard for integrity verification—Git commits, file checksums, blockchain. SHA-384 and SHA-512 offer longer digests (more collision resistance) at the cost of slightly slower computation. The browser converts your text to UTF-8 bytes, feeds it to the hash function, and outputs a fixed-length hexadecimal digest. Same input always produces the same hash; one bit change creates a completely different output (avalanche effect).
Learn more about this tool and related topics in our blog.
Technical analysis of credential strength. Computational cost of brute force attacks vs entropy bits. Implementation requirements for secure authentication systems.
Peek under the hood of Filemint. A deep dive into WebAssembly, Web Workers, and the cutting-edge tech powering our private browser tools.
"I looked this up and found out that SHA-256 is basically the gold standard. If you're checking a game download or something, MD5 is okay, but for anything really important, I'd say stick with the big one!"
Azeem Mustafa
Privacy Architect
Type or paste your text into the input field.
The tool instantly generates hashes for all supported algorithms using SubtleCrypto.digest().
Find the hash you need (e.g., SHA-256).
Click the copy icon next to the hash to save it to your clipboard.
Use the 'Clear' button to reset the form.
Generate secure hash for password storage
MySecureP@ssw0rd
SHA-256: 8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92
Compare hash before and after download
file_contents_example_12345
MD5: 7b8d8e4f2a3c1d5e6f9a0b1c2d3e4f5a (use to verify file unchanged)
Create unique identifier for API authentication
user123_2024-01-15_secret_key
SHA-512: a1b2c3... (512-bit hash for robust authentication)
Verify downloaded files haven't been corrupted or tampered with.
Store hashed passwords in databases instead of plaintext.
Understand how Git uses SHA-1 hashes for commits.
Verify data hasn't changed during transfer or storage.
**MD5** (Message Digest 5): - 128-bit output (32 hex characters) - Fast, but cryptographically broken - Use only for checksums, not security - Collisions can be generated **SHA-1** (Secure Hash Algorithm 1): - 160-bit output (40 hex characters) - Also broken (collisions found in 2017) - Still used by Git, but not for security **SHA-256** (SHA-2 family): - 256-bit output (64 hex characters) - Currently secure, industry standard - Used in Bitcoin, SSL certificates **SHA-512** (SHA-2 family): - 512-bit output (128 hex characters) - More secure than SHA-256, slower - Recommended for high-security applications
A **collision** occurs when two different inputs produce the same hash. **Birthday paradox**: With 2^(n/2) random inputs, 50% chance of collision in n-bit hash. For SHA-256 (256 bits): Need 2^128 attempts for collision (practically impossible) For MD5 (128 bits): Collisions can be generated in seconds **Practical impact**: MD5 shouldn't be used where collisions matter (passwords, signatures)
**DON'T** use plain MD5/SHA for passwords: - Too fast (attackers can try billions/sec) - No salt = rainbow table attacks work **DO** use specialized algorithms: - **bcrypt**: Slow by design, auto-salting, industry standard - **scrypt**: Memory-hard, resistant to GPUs/ASICs - **Argon2**: Winner of password hashing competition **Salting**: Add random data before hashing to prevent rainbow tables. Each password gets unique salt stored alongside hash.
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Learn more about this tool and related topics in our blog.
Technical analysis of credential strength. Computational cost of brute force attacks vs entropy bits. Implementation requirements for secure authentication systems.
Peek under the hood of Filemint. A deep dive into WebAssembly, Web Workers, and the cutting-edge tech powering our private browser tools.
