SHA-256 Hash Generator
Generate SHA-256 or SHA-224 hashes of text, bytes and files of any size, verify downloads and export sha256sum checksum files.
Tool guide
What this tool does
SHA-256 Hash Generator calculates the SHA-256 and SHA-224 digests from the SHA-2 family (FIPS 180-4) for text, raw bytes and files. Files are hashed in streamed chunks with progress, lists can be hashed line by line, and results can be verified against a published value or exported for sha256sum -c.
SHA-256 is the most widely used cryptographic hash today. It turns any input into a 256-bit value, written as 64 hex characters, and no practical way is known to find two inputs with the same hash or to work backwards from a hash. That is why software vendors publish SHA-256 checksums for downloads, why TLS certificates, code signing and Bitcoin rely on it, and why it is the default in tools such as sha256sum, Docker image digests and Subresource Integrity.
This generator implements SHA-256 and the shorter SHA-224 variant exactly as FIPS 180-4 specifies, using a WebAssembly library for speed. Text is hashed as UTF-8 unless you choose hex or Base64 bytes as input. Files are read in 4 MB chunks, so a 10 GB image is processed without loading it into memory, and you see progress and throughput. Hash a list line by line, compare any result with an expected checksum, and download a checksum file that sha256sum -c can verify later. Your data never leaves your device.
How to use SHA-256 Hash Generator
- Select Text or Files as the input source.
- Type text, or drop the file you downloaded.
- Keep SHA-256 as the Algorithm, or switch to SHA-224 if required.
- Choose the Output format; Base64 is used by Subresource Integrity and some APIs.
- Paste the publisher’s checksum into “Compare with expected hash” and look for the Match badge.
- Copy the hash or click “Download checksum file”.
Tips for better results
- For a Subresource Integrity attribute, take the Base64 SHA-256 of the file and write integrity="sha256-<value>". SHA-384 is the usual choice there.
- Always obtain the expected checksum from the official site over HTTPS, not from the same mirror as the file.
- On macOS run “shasum -a 256 file”, and in PowerShell “Get-FileHash file”, to cross-check results.
- The comparison accepts prefixes such as “sha256:”, as found in Docker digests.
Common use cases
- Verifying an operating system ISO or installer before running it.
- Recording file fingerprints for a software release or evidence log.
- Computing a content hash for caching, deduplication or API request signing.
- Checking the digest of a container image layer or a package lock file entry.
Common mistakes to avoid
- Using a single SHA-256 to store passwords. It is designed to be fast; use bcrypt, scrypt, Argon2 or PBKDF2 with many iterations.
- Confusing SHA-256 with SHA3-256. They are different algorithms with different outputs.
- Checking a hash published on a compromised page. A matching hash only proves integrity if the reference value is trustworthy.
Frequently asked questions
Can two files have the same SHA-256 hash?
In theory yes, because there are more possible files than hashes, but no SHA-256 collision has ever been found. With 2^256 possible values, finding one by chance is far beyond any computer.
What is the difference between SHA-256 and SHA-224?
SHA-224 uses the same algorithm with different starting values and keeps only 224 bits of the output. It is mainly used where a shorter digest is required by a standard.
Why is my SHA-256 different from the terminal output?
Commands such as echo add a newline by default. Use echo -n, or hash the file instead of typed text, and make sure both sides use the same encoding.
Is it safe to hash confidential files here?
Yes. Files are read and hashed by your browser; nothing is uploaded, and you can even use the tool offline once the page has loaded.
Feedback & suggestions
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