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ToolSuite
Image Tools

Duplicate Image Checker

Find byte-for-byte identical files among a set of images.

or drag them here

image/* · up to 40 MB · up to 30 files

Processed in your browser

Fill in the form and press “Check for duplicates” to see the result here.

How to use it

  1. 1Select your image, or drag and drop it onto the upload area.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3Press the button. The image is processed on your device - nothing is uploaded.
  4. 4Download the result, or drop in another file to do it again.

About the Duplicate Image Checker

Each file is hashed with SHA-256 and the digests are compared. Files with the same digest are identical in every byte.

This finds exact duplicates only. Two visually identical images saved by different software, or at different quality settings, have different bytes and are correctly reported as different files.

Questions people ask

Is your image uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your image never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.