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Find Duplicate Images

Compare selected image files by SHA-256 content hash to identify exact duplicates, even when their filenames differ.

The report is created from the selected files and can be downloaded after analysis.

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How to use this image tool

  1. Select the images you want to compare.
  2. Review the file and adjust the available settings.
  3. Choose “Find Duplicates” and wait for the completed status.
  4. Inspect the result, then download the new file or report.

What this tool does

Compare selected image files by SHA-256 content hash to identify exact duplicates, even when their filenames differ. Work happens locally with browser APIs, so speed depends on the image dimensions and your device.

Processing rule: The page decodes the selected file, validates its dimensions, applies the requested operation, and creates a new output Blob.

Supported formats and limits

Current versions of Chrome, Edge, Firefox, and Safari generally decode JPEG, PNG, and WebP. This page caps canvas work at 40 megapixels and 16,384 pixels per side. Animated images are treated as a single decoded frame.

Tips for better results

  • Keep the original file until you have checked the download at full size.
  • Use PNG when transparency or sharp interface graphics matter.
  • For photographs, compare the result at 100% zoom before publishing.

FAQ

Does Find Duplicate Images upload my image?

No. Processing runs in your browser. The page does not send the selected image to an image-processing server.

How are exact duplicate images detected?

Each complete file is hashed with SHA-256. Files with the same hash and byte size are reported together as exact duplicates.

Will this tool change my original file?

No. The original remains untouched. Any edited image or report is created as a separate download.

What happens with very large images?

Images above 40 million pixels are stopped before canvas processing to reduce the chance of a browser memory crash.

Why can the downloaded result differ from the preview?

The preview is scaled to fit the page. The downloaded file uses the full output dimensions and selected encoding settings.

Output details

The result card shows real dimensions, byte size, match counts, or metadata fields depending on the tool. Downloads are enabled only after a new result has been created.