SHA Hash Generator
The SHA hash generator produces SHA-1, SHA-256, SHA-384, and SHA-512 message digests from any text input using the browser's SubtleCrypto API. Results are identical to server-side SHA implementations. Free, nothing sent to any server, no account required.
How to generate a SHA hash online
Type or paste your input text into the field. Select the hash algorithm, SHA-1, SHA-256, SHA-384, or SHA-512. The hash is computed automatically and appears in the output field as a lowercase hexadecimal string. Click Copy to copy the full hash to your clipboard. SHA hash online generation through the browser SubtleCrypto API produces results byte-for-byte identical to the output of OpenSSL, Python's hashlib, and Node.js's crypto module.
The hash updates every time you change the input, so you can observe how even a single character change produces a completely different hash. This demonstrates the avalanche effect, a core property of cryptographic hash functions that ensures no relationship is visible between similar inputs and their hashes. Hash text online without sending it to any server by using this tool. The entire computation happens inside your browser tab.
SHA-256 versus SHA-512: which algorithm to use
SHA-256 produces a 256-bit (64 hexadecimal character) hash and is the current industry standard for most cryptographic applications: digital signatures, certificate fingerprints, password hashing pre-processing, and data integrity verification. SHA-256 is part of the SHA-2 family, which replaced SHA-1 following the discovery of collision vulnerabilities. All modern TLS certificates and code signing pipelines use SHA-256 or stronger.
SHA-512 produces a 512-bit (128 hexadecimal character) hash with greater collision resistance at the cost of a slightly longer output. On 64-bit processors SHA-512 is often computed as fast as SHA-256 due to register width. Use SHA-512 when the application requires the highest available security margin, such as long-term document archival, high-value cryptographic signing, and systems that must remain secure against quantum-era attacks. SHA-384 is a truncated version of SHA-512 used in some TLS cipher suites that require exactly 384 bits.
Frequently asked questions
A SHA hash is a fixed-length string produced by a cryptographic hash function applied to any input. In development, SHA hashes are used to verify file integrity (comparing download checksums), fingerprint TLS certificates, pre-process passwords before storing them (combined with a salt), generate unique identifiers from content, and sign code or data packages to detect tampering.
SHA-256 produces a 64-character hexadecimal output (256 bits). SHA-512 produces a 128-character hexadecimal output (512 bits). Both are part of the SHA-2 family and are considered secure for all current applications. SHA-512 has a larger security margin. SHA-256 is more widely supported across APIs and systems. Both are appropriate for modern applications; SHA-1 should no longer be used for security-critical purposes.
No. SHA hash functions are one-way by design. Given a hash output, there is no known algorithm that recovers the original input faster than brute-force searching all possible inputs. This is the preimage resistance property. For short or predictable inputs like common passwords, rainbow tables of precomputed hash values can reverse a hash if the original input was not salted. Always combine SHA hashing with a per-value salt when storing passwords.
No. SHA-1 is considered cryptographically broken for collision resistance. Researchers demonstrated a practical collision attack against SHA-1 in 2017, meaning two different inputs can be crafted to produce the same hash. SHA-1 should not be used for digital signatures, certificate fingerprints, or any security-critical purpose. It remains in this tool for legacy compatibility verification only. Use SHA-256 or higher for all new implementations.