File hash calculator
Calculate a file checksum without uploading it.
How it works & limits
How to use this tool
Calculate a file checksum without uploading it.
Enter your content or open a file, then select Run.
Example input
Hello, developer
Local processing
Your input stays in this browser. Drafts are kept in page memory while switching tools, and disappear on reload.
Text is limited to 1 million characters. Regex runs in a worker, capped at 200,000 characters, 1,000 matches and 1.5 seconds. Inputs above 100,000 characters use manual refresh.
The first page load and on-demand modules require network access. A complete offline cache is not included.