Checksum Calculator
Upload a file to calculate its checksum using SHA-256, SHA-512, SHA-1, and CRC32. Compare against expected hashes to verify file integrity.
Drop a file here or click to select
How to Use the Checksum Calculator
- Drag and drop a file into the upload zone, or click to select a file.
- The tool computes SHA-256, SHA-512, SHA-1, and CRC32 hashes automatically.
- Copy any hash value using the copy button.
- To verify integrity, paste an expected hash in the comparison field and click 'Compare'.
About Checksum Calculator
File checksums are cryptographic hashes computed from a file's contents. They serve as a digital fingerprint, allowing you to verify that a file has not been modified or corrupted during transfer. This tool uses the Web Crypto API and runs entirely in your browser, so your files are never uploaded to any server. It supports SHA-256 and SHA-512 (recommended for security), SHA-1 (deprecated but still widely used), and CRC32 (fast but not cryptographically secure). Comparing checksums is essential when downloading software, verifying backups, and conducting forensic analysis.
Frequently Asked Questions
No. All hash computation happens entirely in your browser using the Web Crypto API. Your files never leave your device.
SHA-256 is the recommended choice for most purposes. It provides strong security and is widely supported. SHA-512 offers a larger hash for additional security. SHA-1 is deprecated for security use but still common in legacy systems. CRC32 is fast but suitable only for error detection, not security.