Generate MD5, SHA1, SHA256, SHA512 and more hashes instantly. 100% in-browser — your data never leaves your device.
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About Hash Functions
What is MD5 and when should I use it? ▼
MD5 produces a 128-bit (32 character) hash. It's fast but NOT cryptographically secure — never use it for passwords or security-critical applications. It's still useful for file integrity checks and checksums where security isn't a concern.
What is SHA-256 and why is it recommended? ▼
SHA-256 is part of the SHA-2 family and produces a 256-bit (64 character) hash. It's currently considered cryptographically secure and is widely used in SSL certificates, blockchain (Bitcoin), and data integrity verification.
Can I reverse a hash back to the original text? ▼
No — hashing is a one-way function. You cannot reverse a hash to get the original text. This is by design. That's what makes hashes useful for storing passwords securely. Attackers would need to use brute force or rainbow tables to crack a hash.
Is SHA-512 more secure than SHA-256? ▼
SHA-512 produces a longer hash (512 bits / 128 characters) and is technically stronger, but SHA-256 is sufficient for most applications. SHA-512 can actually be faster on 64-bit processors. Both are considered secure for current use.