Upload a set of files and see which ones are duplicates. You choose how to compare them (checksum, size, or name). Results show duplicate groups and how much space you could reclaim. All processing runs in your browser.
Checksum comparison hashes the entire file (e.g. MD5). Two files with the same hash are byte-for-byte identical. Size-only comparison is fast but can flag different files that happen to share a size. Name comparison is useful when you expect copies like "file (1).pdf" and "file.pdf".
Cleaning downloads or photo folders, trimming backup sets, or deduplicating a document set. Upload the files you care about, run the scan, then decide which copy to keep. The tool does not delete anything; it only groups duplicates and shows recoverable space.
Desktop apps (e.g. duplicate finders for Windows or macOS) can scan whole drives. This tool works on the files you upload, so it fits quick checks or smaller sets. For hashing single files or verifying integrity, use a checksum validator. For folder listings and metadata, the File Metadata Extractor and File List Generator complement this workflow.
Large files and many files make checksum scanning slower because everything runs in the browser. Name and size checks are quick. "Mark for removal" here is for your reference only; the tool does not delete or modify files on your device.
Last updated: March 2026. Processing is client-side only; no file data is sent to our servers.
