File Checksum Calculator
Description
Compute checksums for files or text to verify integrity. Supports CRC32, MD5, SHA1, SHA256, SHA384 and SHA512 for downloads and backups.
About File Checksum Calculator
A checksum is a short fingerprint of a file or string that lets you confirm data has not been altered or corrupted. This calculator generates checksums and cryptographic hashes for the content you provide so you can compare them against a published value before trusting a download or backup. All hashing is performed locally in your browser, so your files and text never leave your device.
How to use
- Select a file or paste the text you want to fingerprint.
- Choose the algorithm you need, such as CRC32, MD5, or SHA-256.
- Let the tool compute the checksum in your browser.
- Compare the generated value against the expected checksum to verify integrity.
Frequently asked questions
Which algorithms are supported?
The tool supports CRC32, MD5, SHA1, SHA256, SHA384, and SHA512, covering both fast integrity checks and stronger cryptographic hashes.
How do I verify a download with a checksum?
Compute the checksum of the downloaded file using the same algorithm the publisher used, then compare it character by character to the published value. If they match exactly, the file is intact; if not, it was corrupted or tampered with.
Which algorithm should I use?
CRC32, MD5, and SHA-1 are fast and fine for catching accidental corruption, but they are not collision-resistant. For security-sensitive verification, prefer SHA-256 or stronger algorithms from the SHA-2 family.
Are my files uploaded to compute the checksum?
No. All checksum and hash computation runs locally in your browser, so the files and text you select are never uploaded to any server.