File Checksum

Calculate MD5 or SHA checksums for local files and compare existing hashes to check file integrity.

FreeBrowser

Stream any local file in a background worker, with progress and cancellation. Paste an expected hash to compare. MD5 and SHA-1 are for compatibility checks, not security signatures.

Choose local files

Algorithm

Expected hash (optional)

Files stay on this device. Nothing is uploaded.

About File Checksum

Calculate a file checksum with MD5 or a supported SHA algorithm without uploading the file. Compare the digest with a checksum supplied by a trusted source to detect byte-level differences.

How to use File Checksum

Choose a file and a checksum algorithm.
Start hashing and wait for the progress to finish, or cancel if needed.
Copy the digest and compare it with the expected value from the same algorithm.

Input and output example

Input and settings: A file containing exactly the UTF-8 bytes abc Algorithm: SHA-256
Expected output: ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad

When to use this tool

Check a downloaded file against a published checksum.
Compare two local files for identical content.

Limits to know before using it

A matching checksum is useful only when the reference is trusted. MD5 and SHA-1 are compatibility checks, not modern secure signatures; hashing does not scan for malware.

Data handling and cost

The main operation runs in your browser; tool input is not uploaded for processing. The site can still use session cookies and collect operational or usage data as described in the privacy policy.

Free to use in your browser, with no sign-in needed.

Frequently Asked Questions

No. Processing runs in your browser; input and files are not sent to a backend. Loading the website and program assets requires a connection.

The file is read in 1 MiB chunks in a background worker, with cancellation. MD5 and SHA-1 are compatibility checks, not secure signatures.