File ToolsFree

File Checksum Calculator

Calculate MD5, SHA-1, SHA-256, and SHA-512 checksums for any file to verify its integrity after download. Compare against the publisher's checksum to confirm the file is authentic and unmodified. Uses Web Crypto API — files never leave your browser.

Drop any file anywhere, click to browse

File is never uploaded — hashed entirely in your browser

Ctrl+Vto paste a copied file

Frequently Asked Questions

Is the file uploaded to a server to calculate the checksum?▼
No. The file is read and hashed entirely in your browser using the Web Crypto API. Your file is never transmitted anywhere.
Which hash algorithms are supported?▼
MD5 (via a JavaScript library), SHA-1, SHA-256, and SHA-512 (via the native Web Crypto API). SHA-256 is the most commonly provided by software publishers.
How do I use this to verify a downloaded file?▼
Download the file, drag it into the tool, and compare the calculated SHA-256 or MD5 hash against the checksum provided on the publisher's website. If they match, the file is authentic and unmodified.
What is the difference between MD5 and SHA-256?▼
MD5 produces a 32-character hex hash. SHA-256 produces a 64-character hex hash. SHA-256 is cryptographically stronger and recommended for security-critical integrity verification.
Is there a file size limit?▼
No hard limit. Very large files (several GB) may take a minute to hash as the browser reads them in chunks.