Cryptography Tools
SHA3-256 Hash Generator
Calculate a SHA3-256 digest of UTF-8 text locally. The 256-bit value appears as 64 lowercase hexadecimal characters.
✓ Every tool runs in your browser. We do not upload your input or output.
Keyboard shortcuts
Ctrl/⌘ + Enter: process
Ctrl/⌘ + Shift + F: full screen
Esc: exit full screen
Ctrl/⌘ + F in editor: search
How to use
- Enter a text payload or load a text example.
- Run the tool to produce the SHA3-256 digest.
- Compare it with a reference explicitly using SHA3-256.
- Copy the result and record the source text for repeatability.
Examples
Check a manifest line
This will not equal a SHA-256 digest of the same bytes.
Release manifest v3.1
A 64-character SHA3-256 hex digest
Match SHA-3, not a similar name
SHA3-256 is one of the fixed-output functions in the SHA-3 standard. It produces a 256-bit digest, just as SHA-256 does, but the underlying construction and result differ. It also differs from the commonly named Keccak-256 variant used in some ecosystems. Read the protocol name closely before comparing values from different tools. This page implements standardized SHA3-256 and displays the result as lowercase hex.
Use it to inspect test vectors or check exact text shared with a colleague. The editor content is encoded as UTF-8 without changing whitespace. If the expected digest came from a binary file, use a raw-byte hashing utility instead. A matching digest confirms that the compared inputs produce the same summary under the chosen algorithm; it does not authenticate where either copy came from. Computation stays in a browser worker. The NIST SHA-3 standard defines the algorithm.
A practical integration check is to calculate a short fixture in both systems before using a production payload. Make the fixture include a non-ASCII character if Unicode input is expected. That reveals inconsistent text encoding while keeping the test easy to reproduce.
Frequently asked questions
Is SHA3-256 identical to SHA-256?
No. They share an output length but belong to different algorithm families.
Is SHA3-256 the same as Keccak-256?
No. The standardized SHA-3 domain separation differs from the older Keccak variant.
Why is my digest different?
Check the algorithm name, UTF-8 bytes, spaces, and newlines.
Is this suitable for storing passwords?
Use a password hashing algorithm with a salt and work factor instead.