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File Checksum Calculator

Verify a download by computing its SHA-256 without uploading it anywhere.

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Drop a file here, or click to choose one — it is read locally and never uploaded

Quick Tool Overview

The File Checksum Calculator reads a dropped file locally and computes SHA-256, SHA-1, SHA-384, SHA-512, MD5 and CRC32 at once, then compares them against whatever checksum the publisher listed.

What it does
Computes every common checksum of a file
You give it
A file, dropped onto the page
You get back
Six digests, and a match verdict
Best for
Verifying an installer, ISO or archive after download
Developer Tools Free, unlimited use No sign-up Runs in your browser

About the File Checksum Calculator

A published checksum only helps if you actually check it, and checking usually means finding the right command for your operating system. Drop the file here instead and every common digest is computed at once: SHA-256, SHA-1, SHA-384, SHA-512, MD5 and CRC32.

The file never leaves your machine. It is read with the browser's File API and hashed locally, which matters because the files worth verifying are installers, disk images and archives you would not want to upload anywhere. Paste the checksum the publisher gave you and the tool compares it against all six, tells you which one matched, and says plainly if none did.

Key features of the File Checksum Calculator

The file never uploads

It is read with the browser File API and hashed in the tab, which is the only reason checking an installer this way makes sense.

Every algorithm at once

You do not have to know which one the publisher used — all six are computed and the matching one is identified.

Paste-and-compare

Drop in the expected checksum and the tool names which algorithm matched, or says clearly that none did.

Progress on large files

A big image reports as it reads, rather than appearing to have frozen.

Clear about what a match proves

A match means the file is what that page published — not that the page is trustworthy, which is a different question.

How to use the File Checksum Calculator

  1. 1

    Drop the file

    Drag it onto the page or click to choose it. It is read locally.

  2. 2

    Wait for the digests

    All six are computed at once; a large file takes a few seconds.

  3. 3

    Paste the expected checksum

    Whatever the publisher listed, in any of the supported algorithms.

  4. 4

    Read the verdict

    The tool names which algorithm matched, or says clearly that none did.

Frequently asked questions

No. It is read with the browser File API and hashed in the tab. Nothing is sent to any server, which is the only reason it is sensible to check an installer this way.

Reviews of the File Checksum Calculator

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