A SHA-256 hash generator is a free online tool that converts any text into a fixed-length cryptographic digest using the SHA-2 family of hash functions. Paste your text to get instant SHA-256, SHA-384 or SHA-512 hashes computed locally in your browser, with no signup and no limits.
Generate a hash
Compare two hashes
Paste two digests to verify they are identical, for example to check a downloaded file against its published checksum.
What is a SHA-256 hash?
A SHA-256 hash is a fixed 64-character hexadecimal digest produced by the SHA-256 algorithm from any input. It always looks the same length no matter how long the input is, cannot be reversed, and even a one-character change in the input creates a completely different digest.
SHA-256 belongs to the SHA-2 family designed by the NSA and standardized by NIST. Developers use these digests for password storage (with salting), file integrity checks, digital signatures and blockchain systems like Bitcoin. Because the output is deterministic, the same input always produces the same hash, which makes verification simple.
How do I generate a SHA-256 hash online?
Type or paste your text into the box above and the SHA-256 digest appears instantly. Select SHA-384 or SHA-512 for longer digests, toggle uppercase output if your system needs it, then copy the result with one click. Everything is computed in your browser.
There is nothing to install and no account to create. Because hashing happens locally with the WebCrypto API, even sensitive strings like API keys or password candidates never travel over the network.
What is the difference between SHA-256, SHA-384 and SHA-512?
The numbers refer to digest length in bits: SHA-256 outputs 64 hex characters, SHA-384 outputs 96, and SHA-512 outputs 128. Longer digests give a larger security margin against brute-force and collision attacks, at the cost of slightly more computation time. For most everyday uses, SHA-256 is the standard choice.
For most everyday uses such as checksums and token hashing, SHA-256 is the standard choice. SHA-512 can actually be faster on 64-bit processors, while SHA-384 is simply SHA-512 with a different starting state and a truncated output.
How can I check if two files have the same hash?
Generate the hash of each file (or paste the published checksum and your computed one) into the compare tool above. If both digests match exactly, the files are bit-for-bit identical; any difference, even a single byte, produces a totally different hash.
This is the standard way to verify downloads: software vendors publish a SHA-256 checksum next to the installer, and you compare it against the hash of the file you received to rule out corruption or tampering.
FAQs
Is this SHA-256 hash generator free and unlimited?
Yes. Generate as many SHA-256, SHA-384 and SHA-512 hashes as you want: no account, no watermark, no daily limits. All hashing runs in your browser.
Is my text private when I hash it here?
Yes. Your text never leaves your device. Hashing uses the browser's built-in WebCrypto API, so nothing is uploaded to any server.
Why is there no MD5 option?
MD5 is cryptographically broken and collisions can be forged in seconds, so we only offer the secure SHA-2 family: SHA-256, SHA-384 and SHA-512.
Can a hash be reversed to reveal the original text?
No. SHA-2 hashes are one-way functions: there is no practical way to reverse them. The only attack is brute-force guessing of short, predictable inputs.
What does the avalanche effect mean?
Changing even one character of the input produces a completely different hash. This avalanche effect is what makes SHA-2 useful for detecting tampering and verifying file integrity.