Free Online Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes for any text string. All processing happens in your browser — your input never leaves your device.
Hash Algorithms Explained
MD5 (128-bit)
Produces a 32-character hex digest. Fast and widely supported, but cryptographically broken — collisions can be found in seconds. Use only for non-security purposes like file checksums or cache keys where collision resistance is not required.
SHA-1 (160-bit)
Produces a 40-character hex digest. Deprecated for security use since 2017 when a practical collision attack was demonstrated. Still commonly found in legacy systems and Git object IDs.
SHA-256 (256-bit)
Produces a 64-character hex digest. Part of the SHA-2 family and the current standard for general-purpose cryptographic hashing. Used in TLS certificates, Bitcoin, code signing, and HMAC-based authentication.
SHA-512 (512-bit)
Produces a 128-character hex digest. Offers a larger security margin than SHA-256 and can be faster than SHA-256 on 64-bit hardware. Used in high-security applications and password hashing schemes like SHA-512crypt.
Common Use Cases
- File integrity checks: Publish the SHA-256 hash of a download alongside it so users can verify the file has not been tampered with.
- Data fingerprinting: Generate a short, consistent identifier for a piece of content without storing the content itself.
- Checksum verification: Confirm that data transmitted over a network arrived without corruption.
- API signing: Create HMAC-style signatures using a secret key and a hash function to authenticate API requests.
Frequently Asked Questions
For anything security-related — password storage, digital signatures, TLS — use SHA-256 or SHA-512. MD5 and SHA-1 are cryptographically broken and should only be used for non-security purposes like checksums, cache keys, or compatibility with legacy systems that already expect them.
No, hashing is a one-way function by design — there is no algorithm to recover the input from the output. What attackers actually do is guess likely inputs and hash them to see if the result matches, which is why weak/short inputs (like common passwords) are vulnerable even with a strong hash function.
Hash functions are deterministic — the same input always produces the same output, which is exactly what makes them useful for verifying that a file or piece of data has not changed. Any change to the input, even a single character, produces a completely different hash.
This tool hashes text input. To verify a downloaded file's integrity, most operating systems include a built-in checksum utility (certutil on Windows, shasum or md5 on macOS/Linux) that hashes the file directly.
It's completely free with no limits, and nothing is sent anywhere — SHA-1/256/512 hashing runs on the browser's built-in Web Crypto API, and MD5 (which that API doesn't support) runs via a pure JavaScript implementation. Either way, everything stays local to your browser.