Toolkit / Privacy & Security Tools
File Checksum Calculator
Calculate file checksums such as SHA-256 to verify downloads, compare files, or document file integrity.
Privacy note: Security-sensitive tools are designed for local browser use, but you should only handle secrets on a device and browser profile you trust.
Limitations: A checksum confirms file integrity, not whether a file is safe or malware-free.
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How file checksum calculator works
Choose a file and hashing algorithm, then Toolkit calculates the checksum in your browser.
Compare the result with a checksum from a trusted source to confirm the file matches.
Privacy
Security-sensitive tools are designed for local browser use, but you should only handle secrets on a device and browser profile you trust.
Limitations
- A checksum confirms file integrity, not whether a file is safe or malware-free.
- SHA-1 is included for compatibility but is not recommended for security-sensitive verification.
- Very large files can take longer to hash and may use significant device resources.
FAQs
What is a file checksum?
A checksum is a short fingerprint calculated from file contents. If the file changes, the checksum changes.
How do I verify a download?
Calculate the checksum and compare it with the value published by the trusted source.
Does a matching checksum mean the file is safe?
It means the file matches the expected bytes. It does not prove the file is harmless.
Which hash should I use?
SHA-256 is a good default for modern integrity checks.