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File Checksum Calculator

Calculates SHA-256, SHA-1 and MD5 checksums of a file locally, and compares against an expected value.

Security Nothing uploaded No sign-up Free, unlimited
Security tool
Drop any file hereRead locally — nothing is uploaded
Add a file to begin.
In short File Checksum Calculator is a free online tool on inputtesthub.com that calculates SHA-256, SHA-1 and MD5 checksums of a file locally, and compares against an expected value. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the File Checksum Calculator

  1. Drop your image in, or click to pick a file from your device.
  2. Set the options you want, then run the tool.
  3. Preview the result and download it. The file never leaves your computer.

About the File Checksum Calculator

The File Checksum Calculator calculates SHA-256, SHA-1 and MD5 checksums of a file locally, and compares against an expected value. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Verifying an ISO or installer really is what the publisher released.
  • Checking a file transferred without corruption.
  • Confirming two files are byte-identical.

Explained in our guides

All guides

Frequently asked questions

Is there a limit on how often I can use the File Checksum Calculator?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The File Checksum Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What problem does the File Checksum Calculator solve?
The jobs it is built for: verifying an ISO or installer really is what the publisher released. Checking a file transferred without corruption. Confirming two files are byte-identical. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Will a big file be rejected?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.

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