What this tool does
Checksums verify that a download or build artefact arrived intact. Choose a file and the browser hashes it locally with Web Crypto. The file is never uploaded and no filename leaves the page.
How to use it
- Choose a local file.
- Pick the hash algorithm.
- Copy the checksum and compare it with the published value.
Questions
Is the file uploaded?
No. The browser reads the bytes locally and computes the digest in the tab.
How large can the file be?
It depends on available browser memory because the file is read into an ArrayBuffer. Common multi-gigabyte files may be slow.
Which algorithm should I use?
SHA-256 is the usual default. SHA-512 is fine too; SHA-1 is legacy only.