Browser-only tool
File hash generator
Choose a file and calculate its SHA-256 checksum locally. Use file hashes to verify downloads, compare artifacts, and document releases.
Warning: a matching hash proves byte equality, not that a file is safe to open or execute.
Privacy And Limitations
Files are read locally by your browser and are not uploaded by this static page.
- Large files can take time and memory in the browser.
- A matching hash proves byte equality for that algorithm, not that a file is safe to run.
- For signed software, verify publisher signatures in addition to hashes.
FAQ
Are files uploaded?
No. The page reads the selected file locally and hashes it with the browser Web Crypto API.
Which algorithm is used?
This first version uses SHA-256 because it is strong, widely supported, and available in modern browsers.
Can a hash prove a file is malware-free?
No. It only verifies that bytes match an expected value. Malware scanning and publisher signatures are separate controls.
Why not include MD5 for files?
MD5 is kept for legacy text checksums, but SHA-256 is the safer default for file integrity.
Can I hash very large files?
Browser memory and performance vary. Very large files may be slow, especially on low-memory devices.