SHA Hash Generator guide
Calculate SHA-256, SHA-384, or SHA-512 hexadecimal digests for text and files using the browser’s cryptography API.
What this tool does
The Hash Generator reads text as UTF-8 bytes or reads the exact bytes of a selected file, then calculates a SHA-2 digest using the Web Crypto API. The result is displayed in lowercase hexadecimal. SHA-256 produces 64 hexadecimal characters, SHA-384 produces 96, and SHA-512 produces 128.
A cryptographic digest acts like a fixed-length fingerprint of input data. The same algorithm and identical bytes produce the same output. A one-byte change normally produces a very different digest, which makes hashes useful for comparing downloads, checking whether a file changed, identifying cached content, and building development workflows.
Hashing is one-way processing, not encryption. The original content cannot be decrypted from a digest, but attackers can still guess common or low-entropy input and hash each guess. Raw SHA-2 is therefore not suitable for storing passwords; password systems require a dedicated slow, salted password-hashing algorithm.
How to use it
- Choose text or file input.
- Enter text or select a file up to the displayed local limit.
- Choose SHA-256, SHA-384, or SHA-512.
- Select Generate hash.
- Copy the hexadecimal digest and compare it character for character with the trusted value.
When checking a downloaded file, obtain the expected digest from an authenticated source. A checksum shown on the same compromised download page may not provide independent assurance.
Benefits
- Supports three modern SHA-2 digest sizes
- Hashes both UTF-8 text and raw file bytes
- Uses the browser’s native cryptography implementation
- Produces easy-to-copy lowercase hexadecimal output
- Keeps file content and text on the device
Security and comparison notes
A matching cryptographic digest is strong evidence that two byte sequences are identical under the chosen algorithm. It does not prove who created the file, whether its contents are safe, or whether the expected digest itself is trustworthy. Digital signatures add an identity and key-verification layer that a plain hash does not provide.
Text hashes are sensitive to invisible differences. Line endings, capitalization, spaces, Unicode normalization, and a final newline all change the bytes and therefore the result.
Use the HMAC Generator when the receiving system expects a shared secret as part of message authentication. A plain hash and an HMAC can use the same SHA family while producing values with different security meaning.
Security notice: Do not use a plain SHA-2 digest as a password database scheme or as proof of authorship. Use an approved password-hashing or digital-signature system for those purposes.