✅Checksum Calculator

Calculate and verify file checksums (MD5, SHA-1, SHA-256).

Select File

Select a file to compute SHA-1, SHA-256, and SHA-512 checksums.

About Checksum Calculator

Checksum Calculator computes MD5, SHA-1, and SHA-256 checksums for any file directly in your browser, helping you verify file integrity after download or transfer. Compare your calculated checksum against a publisher-provided value to confirm the file has not been corrupted or tampered with.

How to Use Checksum Calculator

1
Select your file
Click 'Choose File' to select the file you want to calculate a checksum for. Large files may take a few seconds to process.
2
Choose the hash algorithm
Select MD5, SHA-1, or SHA-256 depending on which algorithm the checksum you're verifying against was generated with.
3
Compare checksums
Copy the calculated checksum and compare it against the reference value from the file's source. If they match, the file is intact.

Common Use Cases

Verifying the integrity of downloaded software or OS installation images
Confirming that a file transferred over a network arrived without corruption
Checking that a downloaded archive matches the publisher's provided checksum
Detecting unauthorized modifications to files in a security audit

Frequently Asked Questions

What is a checksum and why is it important?

A checksum is a hash value calculated from a file's contents. Comparing a file's checksum against a trusted reference value confirms the file is complete and unmodified — important for verifying downloaded software, ISO images, and security-sensitive files.

Is my file uploaded to a server when calculating the checksum?

No — the checksum is calculated entirely within your browser using the Web Crypto API. Your file is never uploaded to any external server.

Which checksum algorithm should I use?

Use SHA-256 for security-sensitive verification (it is the current standard). MD5 and SHA-1 are faster but considered cryptographically weak and should only be used when the publisher only provides those values.