Hash Generator
One-Way Fingerprints for Any Piece of Text
A cryptographic hash function takes an input of any length and produces a fixed-length digest that's practically impossible to reverse and changes completely if even one character of the input changes. That combination — deterministic, one-way, and sensitive to the smallest change — is what makes hashing useful for verifying file integrity, indexing data, and fingerprinting content without exposing the original.
The Formula
The same input and algorithm will always produce the same digest, but there's no formula to reverse a digest back into its input — that one-way property is the entire point of a cryptographic hash.
Where This Matters
- File integrity checks — comparing a downloaded file's hash against a published value to confirm it wasn't corrupted or tampered with.
- Data deduplication — identifying identical content by comparing hashes instead of full byte-for-byte contents.
- Checksums in version control and packaging — many build and package systems record hashes to detect unexpected changes.
Algorithm Comparison
| Algorithm | Digest length | Status |
|---|---|---|
| MD5 | 128 bits (32 hex chars) | Broken for security use; fine for non-adversarial checksums |
| SHA-1 | 160 bits (40 hex chars) | Deprecated for security use; collisions demonstrated |
| SHA-256 | 256 bits (64 hex chars) | Widely used, part of the SHA-2 family |
| SHA-512 | 512 bits (128 hex chars) | Larger digest, same SHA-2 family design |
MD5 and SHA-1 are considered cryptographically broken for security-sensitive purposes (collision resistance) but remain common for non-adversarial checksums.
How to Use This Calculator
- Enter the Text to hash.
- Select the algorithm: MD5, SHA1, SHA256, or SHA512.
- Select Calculate to get the hexadecimal digest.
Related Calculations
For password-specific security rather than general hashing, see the Password Strength Calculator or the Encryption Key Length Calculator.