How to get a file’s hash
- Choose Text to hash typed text, or "A file" to hash a file.
- All hashes appear at once. Copy the one you need.
- To verify a download, paste the expected checksum; the matching line turns green.
Text is hashed as UTF-8, the same way command-line tools such as sha256sum do.
Questions
How do I check that a download is not corrupted or tampered with?
Copy the checksum from the download page (usually SHA-256), choose "A file", open the downloaded file, and paste the checksum into the compare box. A green match means the file is exactly what the publisher released.
Is my file uploaded?
No. The file is read in pieces inside your browser, so even multi-gigabyte files work without uploading anything.
Which hash should I use?
Use SHA-256 for checking downloads and for anything security-related. MD5 and SHA-1 are fine for spotting accidental changes but can be forged on purpose. CRC32 is a quick check used in ZIP files.
Can a hash be turned back into the original text?
No. Hashes are one-way. That is also why a short password hashed with MD5 is weak: attackers simply try many guesses and compare the results.
Credits
Built on hash-wasm (MIT). OneTooling is not affiliated with that project.