File Checksum Tool
File Checksum Tool computes a file's SHA-1 checksum locally by reading the complete file into browser memory and compares it to an expected value. Free, fast, and completely private.
File Checksum Tool is a browser-based web developer tool on WebDevToolsBase. File Checksum Tool computes a file's SHA-1 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 Tool is a free checksum Tools utility that runs entirely in your browser — nothing you enter is uploaded.
How to use File Checksum Tool
- 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 Tool 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 does File Checksum Tool do?
File Checksum Tool 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.
Does File Checksum Tool cost anything?
No — File Checksum Tool is completely free, with no sign-up and no hidden limits.
Does File Checksum Tool upload my data?
No — File Checksum Tool processes everything locally in your browser, so nothing you enter is uploaded or stored.
Does File Checksum Tool work on mobile?
Yes — File Checksum Tool is just a web page and runs on any modern browser, including phones and tablets.