File Checksum Calculator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes. Free, fast, and runs 100% in your browser.
Checksums verify that data has not been modified during transfer or storage. This calculator generates SHA-256 checksums from text input, allowing you to compare hashes and detect any changes — even a single character difference produces a completely different hash.
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Hash Generator
Generate cryptographic hashes using the Web Crypto API
All hashes are generated using the browser's native Web Crypto API. MD5 has been removed as it is cryptographically broken. Use SHA-256 or SHA-512 for security-sensitive applications.
Feature Overview
| Feature | Details |
|---|---|
| SHA-256 | ✓ |
| SHA-512 | ✓ |
| Instant results | ✓ |
| Privacy | 100% client-side |
Frequently Asked Questions
How do I verify a checksum?
Generate the hash of your data and compare it to the expected hash. If they match exactly, the data is unmodified.
Which algorithm should I use?
SHA-256 is the most widely used. SHA-512 offers more security. SHA-1 is deprecated for security use.