SHA-256 Generator
Calculate the SHA-256 hash of any text or file. Files are read in slices and hashed as they stream, so even multi-gigabyte downloads can be checked without uploading them anywhere, and a progress bar shows how far it has got. Choose lower- or upper-case hex or Base64, and paste an expected hash to compare.
- Runs in your browser
- No sign-up
- Free to use
How to use SHA-256 Generator
- Type or paste text, or choose a file.
- Watch the hash appear; large files show progress.
- Choose hex, upper-case hex or Base64.
- Paste the published hash to check that it matches.
SHA-256 Generator features
Text and files
UTF-8 text or any file, of any size.
Streaming
Files are hashed in 4 MB slices; memory use stays low.
Three formats
Lower-case hex, upper-case hex and Base64.
Comparison
Checks a pasted hash, ignoring case, spaces and “sha256:” prefixes.
Verified implementation
Matches the standard SHA-256 test vectors.
Private
Nothing is uploaded; the file never leaves your device.
When to use SHA-256 Generator
- Verifying a downloaded installer or ISO image.
- Producing a checksum to publish next to a release.
- Hashing a string for a configuration or API.
- Checking whether two files are identical.
SHA-256 Generator FAQ
What is SHA-256?
A cryptographic hash function from the SHA-2 family that turns any input into a 256-bit value, written as 64 hexadecimal characters. Changing a single bit of the input changes the hash completely.
Is my file uploaded?
No. It is read by your browser and hashed on your device. You can disconnect from the internet before choosing the file.
Why does my text hash differ from another tool?
Hashes are calculated over bytes. Different line endings, a trailing newline or a different text encoding change the bytes and therefore the hash. This tool uses UTF-8 and hashes exactly what is in the box.
Can SHA-256 be reversed?
No. A hash is one-way. For short or common inputs such as simple passwords, attackers can guess and compare, which is why passwords need slow, salted hashes instead.
How large can the file be?
There is no fixed limit; files are processed in slices. Very large files simply take longer.
What does the comparison accept?
Hex in any case, with or without spaces or a “sha256:” or “SHA256=” prefix, and Base64.
Fingerprints for data
A SHA-256 hash is a short fingerprint of data. The same input always gives the same 64 hexadecimal characters, and any change, even a single bit, gives a completely different result. Finding two different inputs with the same hash is, as far as anyone knows, computationally infeasible, which is what makes the fingerprint trustworthy.
The most common use is verifying downloads. Software publishers list the SHA-256 hash of each file; after downloading you hash your copy and compare. A match proves the file arrived intact and, if the hash came from a trusted source, that it has not been tampered with.
Hashing large files in a browser used to mean loading them into memory in one piece. This tool streams instead: it reads the file in slices of a few megabytes and feeds each into an incremental SHA-256 implementation, keeping memory use small and showing progress as it goes.
SHA-256 is not a password storage method on its own. It is deliberately fast, which helps attackers guessing passwords. Systems that store passwords should use a slow, salted algorithm such as Argon2 or bcrypt. For integrity checks and fingerprints, SHA-256 is exactly right.