Calculate a SHA-256 checksum for a local file.
Generate a fingerprint to compare two copies of a file or verify a download against a known checksum. SHA-256 is calculated on your device.
Calculate a downloaded file's SHA-256 digest and compare it with a checksum supplied through a trusted source. Compare the complete value, not just its first or last characters. An untrusted checksum does not establish that the file is safe.
Hash each copy and compare the resulting values to identify whether their byte contents match. This can help after a transfer or backup, even when the filenames differ. It is not a replacement for checking the right file was selected.
Matching checksums indicate matching bytes, but do not establish that a file is safe. Large files require memory because the browser reads the file at once.
Two files with identical bytes but different filenames.
The same 64-character hexadecimal SHA-256 digest.
The tool hashes file contents. A filename change alone does not affect the digest, while a content change generally produces a different result.
Check that the published checksum is SHA-256 and refers to the exact file version you selected. A recompressed archive, modified document, or different download edition has different bytes.
Browser cryptographic APIs require a secure context such as HTTPS or localhost. Also check the 100 MB file limit; the file is read into browser memory before hashing.
A little clarity before you get started.
No. The hash depends on its contents, not its filename.
No. It supports a byte-for-byte comparison with a reference value. Safety also depends on whether the reference and source are trustworthy and whether the file itself is appropriate to open.
The result is a SHA-256 digest expressed as 64 hexadecimal characters. It is not an MD5, SHA-1, or SHA-512 checksum.
No. A hash is not a reversible encoding or a backup. Keep the original file; the digest is only a compact fingerprint used for comparison.
Not if its bytes stay the same. Changes to content, including metadata stored inside a file, do change the input being hashed.
No. This tool is free to use without signing in. An account lets you keep a list of favorite tools.
Yes, with a current browser. File support, download behavior, and available memory vary by device. For large documents and images, a computer is often more comfortable.