File Checksum
File Checksum computes a file's SHA-256 checksum locally by reading the complete file into browser memory and compares it to an expected value. Free, fast, and completely private.
File Checksum is a browser-based web developer tool on WebDevToolsBase. File Checksum computes a file's SHA-256 checksum locally by reading the complete file into browser memory and compares it to an expected value. Free, fast, and completely private. To use it, choose a file, choose the checksum algorithm, and wait for its checksum — no signup and nothing to install.
File Checksum is a free checksum Tools utility that runs entirely in your browser — nothing you enter is uploaded.
How to use File Checksum
- Choose the file whose bytes you want to checksum.
- Choose Algorithm; Expected checksum is an optional comparison value, not the source content.
- Wait for the selected file checksum to finish; changing the file or algorithm starts a new calculation.
- Use Copy to copy the displayed checksum, then compare it with a checksum from a trusted source.
About this tool
File Checksum computes a checksum from the selected file bytes. The optional Expected checksum field supplies a comparison value; it is not a pasted-text hashing input.
The selected source is processed in your browser. Processing time and supported file sizes depend on the file and your device.
Frequently asked questions
What is File Checksum for?
File Checksum computes a checksum from the selected file bytes. The optional Expected checksum field supplies a comparison value; it is not a pasted-text hashing input.
Is File Checksum free to use?
Yes — File Checksum is completely free, with no usage limits.
Where is my data processed by File Checksum?
Entirely in your browser — File Checksum keeps your data on your own machine and sends nothing anywhere.
Does File Checksum work on mobile?
Yes — File Checksum is just a web page and runs on any modern browser, including phones and tablets.