About this tool
Find identical files in a folder by SHA-256, see the space extra copies use, the largest files and space by type — nothing is deleted.
Files are first grouped by exact size, because files of different sizes cannot be identical. Same-size files are then compared by a SHA-256 of their first and last 64 KB, and only the remaining candidates are read completely, in 8 MB chunks, to confirm with a full SHA-256 checksum.
Example: a photo folder with 4,000 files may show 37 duplicate groups using 1.2 GB of extra space.
Identical content can still be needed in two places (for example backups). Review each group before deleting anything yourself.
Quick steps
- Choose your files — they stay on your device.
- Set the options and check the preview or the test results.
- Download the result. Your original files are never changed.
Files are processed in your browser and are not uploaded to 1CLIK.
FAQ
How does the Duplicate & Large File Finder work?
Files are first grouped by exact size, because files of different sizes cannot be identical. Same-size files are then compared by a SHA-256 of their first and last 64 KB, and only the remaining candidates are read completely, in 8 MB chunks, to confirm with a full SHA-256 checksum.
What should I keep in mind?
Identical content can still be needed in two places (for example backups). Review each group before deleting anything yourself.
Are my files uploaded?
No. Everything happens on your device; nothing is deleted or overwritten, and results are new downloads.