What SHA-256 produces
SHA-256 belongs to the SHA-2 family of hash functions. It reads any amount of input and produces a 256-bit fingerprint, written as 64 hexadecimal characters. Like every hash function it is deterministic, so identical text always gives an identical result, and it is one-way, so you cannot compute the text back from the output.
Its main strength over older algorithms is collision resistance. No practical method is known for finding two different inputs with the same SHA-256 value, which is why it is used in digital certificates, software verification, version control systems and many blockchain designs.
Typical reasons to hash text with SHA-256
The most common reason is verification. A project publishes a SHA-256 value, you compute the value of what you have, and the two should match exactly. Developers also use it to build stable cache keys from strings or to check what an API expects for a signed request.
A plain, unsalted SHA-256 is still too fast to be a good way to store passwords, because attackers can test huge numbers of guesses quickly. If you are checking a legacy system that still uses the older algorithm, the MD5 Generator covers that, and the Hash Generator gathers several algorithms in one place.
How to generate a SHA-256 hash with this tool
- The "Text to hash" box starts with "Hello, world!" as a sample.
- Replace it with your own text. Everything in the box counts, including spaces and new lines.
- The "SHA-256 hash" line shows the 64-character value and refreshes as you type.
- Click Copy to copy it.
The hash is calculated with the Web Crypto API built into your browser, after the text is converted to UTF-8 bytes. Nothing is submitted by the page, and the interface itself states that your text is not sent anywhere. The result is lowercase hexadecimal. There are no options for salting, uppercase output or hashing a file; the tool handles text only.
Why your hash may not match
When a value from another tool or system disagrees with this one, compare the inputs character by character. A trailing newline from a file, a space at the end of a line, different line endings, or a curly quote instead of a straight one all change the hash completely. A single changed character produces an entirely different 64-character result, so there is no such thing as a nearly matching hash.
Also confirm both sides use the same text encoding. This tool encodes text as UTF-8, but a system that hashes UTF-16 or raw file bytes will produce different output for the same visible words.
A hash is not a secret either: anyone with the same text gets the same result, so it does not hide a short, guessable value.