Checksum Calculator
Calculate and verify file checksums (MD5, SHA-1, SHA-256, SHA-512, CRC32) entirely in your browser. Your files never leave your device.
Drop your file here
or click to browse from your device
Drop any file — up to 2 GB. All checksums computed locally in your browser. Supports MD5, SHA-1, SHA-256, SHA-512, and CRC32.
Frequently Asked Questions
- Is this checksum calculator free?
- Yes, 100% free. No account required, no file size limits (handles files up to 2 GB), and no usage caps.
- Are my files safe? Is anything uploaded?
- Nothing is uploaded. All checksum computation runs locally in your browser using the Web Crypto API and JavaScript. Your files never leave your device.
- What is a checksum and why do I need it?
- A checksum (or hash) is a fixed-length fingerprint of a file. It is used to verify that a downloaded or transferred file has not been corrupted or tampered with. If even a single byte changes, the checksum changes completely.
- Which algorithm should I use — MD5, SHA-256, or CRC32?
- Use SHA-256 when verifying software downloads or important data — it is cryptographically secure and widely trusted. Use MD5 or CRC32 only for quick non-security integrity checks (detecting accidental corruption). SHA-512 offers the highest security margin.
- How do I verify a file download?
- Drop your downloaded file into the tool and wait for all hashes to appear. Then paste the expected hash (usually published on the software's download page) into the Verify Hash input. A green check means the file is intact; a red X means it has been modified or corrupted.
- Does it work on large files?
- Yes. The tool streams large files in 2 MB chunks to avoid freezing your browser, showing a progress bar throughout. Files up to 2 GB are supported.
- Does it work on mobile?
- Yes, works on all modern browsers including Safari and Chrome on iOS and Android.