File Checksum Calculator
Calculate a SHA-256 or SHA-512 file hash locally and compare it with an expected checksum.
How can I check that a file is unchanged?
Calculate the file's hash using the same algorithm as the expected checksum. Matching hashes provide strong evidence that the contents match the file used to create that checksum.
Your result
A little clarity, right here.
Choose a file and run the tool. Your result will appear here, ready to download.
Three simple steps
How to use File Checksum Calculator
Choose a supported file from your device.
Set the options and run the tool.
Review the report, then copy or download your result.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
A matching hash does not establish who created a file or whether it is safe. Use a checksum from a trusted source.
Limits: 500,000 characters per text field; files up to 20 MB each, 10 files and 50 MB total. Processing stops after 30 seconds.