File checksum
This tool reads file bytes into the Web Crypto digest API and returns a lowercase hexadecimal checksum. The complete operation runs in temporary browser memory, so the input is never uploaded or stored by LocalKit.
The input stays available if you need to adjust a setting.
How to use file checksum
- 1
Add the source values or files shown in the workbench.
- 2
Choose the settings for file checksum.
- 3
Run the tool, inspect the local result, then copy or download it.
A realistic example
Generate a SHA-256 hash and compare it with a publisher's checksum before opening a download. The source and generated result remain in this browser tab throughout the operation.
Supported formats and limits
Input: any local file. Output: hexadecimal digest.
- A matching checksum verifies bytes, not whether the publisher itself is trustworthy.
- Available memory and browser limits still apply to very large inputs.
Questions people ask
What does file checksum change?
This tool reads file bytes into the Web Crypto digest API and returns a lowercase hexadecimal checksum.
Is any input sent to a server?
No. LocalKit performs this operation in your current browser tab.