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.

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.

Updated June 2026

1Upload your file
2Choose a hash algorithm
3Copy the checksum

Drop any file anywhere, click to browse

File is never uploaded — hashed entirely in your browser

Ctrl+Vto paste a copied file

How to use File Checksum Calculator

1
Upload your file
Drag and drop any file into the upload area, or click to browse and select it.
2
Choose a hash algorithm
Pick MD5, SHA-1, SHA-256, or another supported algorithm.
3
Copy the checksum
Compare it against the publisher's value to verify the file wasn't corrupted or tampered with.

Frequently asked questions

Everything you need to know about file checksum calculator.

No. The file is read and hashed entirely in your browser using the Web Crypto API. Your file is never transmitted anywhere.

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How to use File Checksum Calculator

Upload your file

Choose a hash algorithm

Copy the checksum

Frequently asked questions

−Is the file uploaded to a server to calculate the checksum?

+Which hash algorithms are supported?

+How do I use this to verify a downloaded file?

+What is the difference between MD5 and SHA-256?

+Is there a file size limit?

Explore more free File Tools

Need help with File Checksum Calculator?