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Generate SHA3-224, SHA3-256, SHA3-384, and SHA3-512 cryptographic hashes from any text input. Free browser-based SHA-3 tool, no upload required.
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Enter text and click Generate HashType or paste any string into the input field on the left.
Select a specific SHA-3 variant or generate all four at once.
Click the copy button next to any hash or use Copy All to grab everything.
SHA-3 (Secure Hash Algorithm 3) is the latest member of the Secure Hash Algorithm family, standardized by NIST in 2015. Unlike SHA-1 and SHA-2, SHA-3 uses the Keccak sponge construction — making it structurally different and resistant to length-extension attacks.
SHA-3 is a cryptographic hash function standardized by NIST in 2015. Unlike SHA-2, which is based on the Merkle–Damgård construction, SHA-3 uses the Keccak sponge construction — making it architecturally distinct and immune to length-extension attacks that can affect SHA-2.
For most general security purposes, SHA3-256 offers a good balance of speed and security (256-bit output). Use SHA3-512 for maximum security. SHA3-224 and SHA3-384 are useful when specific output lengths are required by standards or protocols.
Yes — all hashing is performed entirely in your browser using JavaScript. Your input is never sent to any server. However, remember that hashing alone is not encryption; hashes are one-way and cannot be reversed to recover the original text.
No. SHA-3 is a one-way cryptographic function — it is computationally infeasible to reverse a SHA-3 hash to recover the original input. This is a fundamental property of secure hash algorithms. If you need two-way data transformation, use encryption instead.
By default, hashes are displayed as hexadecimal strings. The Base64 option encodes the raw hash bytes as a Base64 string, which is shorter and useful in contexts like HTTP headers, JWTs, or systems that prefer alphanumeric output.
They are related but not identical. Keccak is the algorithm that won the SHA-3 competition. However, the final NIST SHA-3 standard uses slightly different padding than the original Keccak submission. This tool implements the official NIST SHA-3 standard, not the raw Keccak variant used in Ethereum.
A SHA-3 hash generator is a tool that applies the SHA-3 (Secure Hash Algorithm 3) cryptographic function to an input string, producing a fixed-length digest known as a hash. This tool supports all four official SHA-3 output lengths: SHA3-224, SHA3-256, SHA3-384, and SHA3-512, enabling you to produce hashes of 224, 256, 384, or 512 bits respectively from any text input — all computed directly in your browser.
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SHA-3 is built on the Keccak sponge construction, which is fundamentally different from its SHA-1 and SHA-2 predecessors. The sponge function absorbs input data and then squeezes out the hash output. This design eliminates the structural weaknesses of Merkle–Damgård constructions, most notably length-extension attacks — a vulnerability that affects SHA-256 and SHA-512 without HMAC wrapping.
The Keccak algorithm operates on a 1600-bit state matrix (5×5 grid of 64-bit lanes) and applies five permutation steps — Theta, Rho, Pi, Chi, and Iota — in 24 rounds. The rate and capacity of the sponge vary by variant: SHA3-256 uses a 1088-bit rate and a 512-bit capacity, while SHA3-512 uses a 576-bit rate and a 1024-bit capacity.
The four NIST-standardized SHA-3 variants differ primarily in the length of their output digest and their internal capacity settings:
Many developers wonder whether to use SHA-3 or SHA-2 (SHA-256, SHA-512). Both are currently considered secure and approved by NIST. The main practical differences are:
SHA-3 hashes are used in many security-critical scenarios across software development, cryptography, and data management:
This tool supports two output formats for SHA-3 hashes. Hexadecimal is the most common representation — each byte of the hash is expressed as two hex characters (0–9, a–f). A SHA3-256 hash in hex is 64 characters long. Base64 encodes the raw hash bytes using 64 printable characters (A–Z, a–z, 0–9, +, /), resulting in a shorter string. A SHA3-256 hash in Base64 is 44 characters. Base64 is commonly used in HTTP headers, JWTs, and systems where compact representation is preferred.
While SHA-3 is a strong cryptographic hash function, it's important to understand its appropriate use. SHA-3 is not an encryption algorithm — hashes are one-way and cannot be decrypted. For password storage, use a dedicated password hashing function like Argon2, bcrypt, or scrypt, which include salting and computational cost factors. SHA-3 alone, without salting, is vulnerable to rainbow table attacks for commonly known inputs. For message authentication, wrap SHA-3 in an HMAC construction to ensure authenticity alongside integrity.