Checksum Calculator
Calculate MD5, SHA-1, SHA-256, and SHA-512 checksums. Verify file integrity with multiple hash algorithms.
Privacy & Security: This tool is for personal use. Your files are not uploaded to any server. All hash calculations happen client-side in your browser.
Disclaimer: MD5 and SHA-1 are considered cryptographically broken. Use SHA-256 or SHA-512 for security-critical applications.
About Checksum Calculator
A checksum is a digital fingerprint of a file. By calculating and comparing checksums, you can verify that a file hasn't been corrupted or tampered with during transfer or storage. This free online tool calculates multiple hash types for comprehensive file verification.
How to Use
- Select a file by dropping it onto the upload area or clicking to browse.
- Choose which hash algorithms to calculate (MD5, SHA-1, SHA-256, SHA-512).
- Click Calculate Checksums to generate the hashes.
- Copy any hash value or use the verify section to compare against a known checksum.
Frequently Asked Questions
Is my file data kept private?
Absolutely. All hash calculations happen entirely in your browser using the Web Crypto API. No file data is sent to any server, logged, or stored anywhere.
Which hash algorithm should I use?
SHA-256 is recommended for most purposes as it offers a good balance of security and speed. MD5 is fast but cryptographically broken. SHA-512 provides the highest security but is slower.
What's the file size limit?
The tool supports files up to 2GB. Larger files may cause browser memory issues. For very large files, consider using command-line tools.
How do I verify a downloaded file?
Calculate the checksum of your downloaded file and compare it with the checksum provided by the source. If they match, the file is intact and unmodified.
Can two different files have the same checksum?
Technically possible (called a hash collision), but extremely unlikely with SHA-256 or SHA-512. MD5 and SHA-1 have known vulnerabilities and should not be used for security purposes.