Checksum Calculator

A checksum is a fixed-length string generated by a hash function from any input data. Even a tiny change in the input produces a completely different checksum. By comparing checksums, you can verify that a file was not altered during download, transfer, or storage. It acts as a digital fingerprint for data integrity.

SHA-256 is the current standard recommendation for file verification — it is fast, widely supported, and has no known vulnerabilities. MD5 and SHA-1 are still common but have known collision attacks and should not be used for security-critical verification. For maximum security, use SHA-512.

Calculate the checksum of your downloaded file using the same algorithm the provider used (usually SHA-256). Compare your result character-by-character with the checksum published on the download page. If they match exactly, your file is identical to the original. Any difference means the file was modified or corrupted.

No — the file is processed entirely in your browser using the Web Crypto API. The file data never leaves your device. This makes it safe to hash confidential documents, sensitive executables, or any private files without privacy concerns.

Yes — switch to text mode and enter any string to calculate its hash. This is useful for generating content hashes, verifying API request signatures, or comparing text content. The text is encoded as UTF-8 before hashing, consistent with most server-side implementations.