File SHA-256 checker

Calculate a file’s original byte digest locally and compare it with a supplied digest. A match is not a safety guarantee.

How to use

1. File
2. Calculate
3. Copy result

Compare file bytes with SHA-256

Choose one file; the tool calculates SHA-256 from its original bytes in your browser without converting them to text. The file and its name are not sent to a server. Empty files are valid; the limit is 50 MiB (52,428,800 bytes). The entire file is loaded into memory, so memory use may increase. Optionally enter an expected digest of exactly 64 hexadecimal characters obtained separately from a trusted source. Taking both the file and digest from the same untrusted source does not establish authenticity. A match shows byte consistency only; it does not guarantee that the file is harmless or its source trustworthy. A one-byte change in content or metadata stored inside the file changes the digest; renaming the file alone does not change its bytes. SHA-256 is not encryption or a password-storage method. Changing the file or expected digest, or pressing Clear, invalidates the previous result. This logical cancellation does not physically stop an already started Web Crypto calculation; its stale result is discarded. A current browser with Web Crypto support and HTTPS is required.