What Is Duplicate Image Detection?
Duplicate image detection generates a perceptual hash fingerprint for every image, compares the fingerprints pairwise with Hamming distance, and groups highly similar images together.
It's far more reliable than comparing file sizes or names — even copies with different names or dimensions are caught as long as the content matches.
How to Find Duplicate Images
Three steps to find duplicate images:
- Drag in or select multiple images (up to 20 at once; PNG, JPG, WEBP, or BMP supported).
- Click Find Duplicates to start scanning — each image's hash is computed automatically.
- Review the duplicate groups and similarity scores, then delete the copies you don't need.
Tips
- Images with a similarity above roughly 80% are grouped together.
- Images in the same group may not be pixel-identical — preview before deleting.
- Great for cleaning up downloaded assets, photo backups, and other duplicated content.