File ToolsFree

Duplicate File Finder

Upload multiple files and find exact duplicates by comparing their SHA-256 checksums. Files with identical hashes are grouped together regardless of their names. Helps you identify and clean up redundant files in a batch. No server upload, no signup.

Drop multiple files anywhere, click to browse

Files are compared by SHA-256 checksum — nothing is uploaded

Frequently Asked Questions

How are duplicate files detected?▼
By comparing SHA-256 checksums of every file. Two files with identical SHA-256 hashes are byte-for-byte identical, regardless of their filename, date modified, or location.
Does this work on images, videos, documents?▼
Yes. Any file type can be compared — images, videos, audio, documents, code files. The hash comparison works on the raw bytes of any file.
Are files uploaded to a server?▼
No. Files are read and hashed entirely in your browser using the Web Crypto API. Your files are never transmitted anywhere.
Can it detect near-duplicates (visually similar images)?▼
No. This tool detects exact byte-for-byte duplicates only. Near-duplicate or visually similar image detection requires perceptual hashing (pHash) which is a different algorithm.
How many files can I check at once?▼
As many as browser memory allows. Checking 50-200 files under 10MB each works smoothly in most browsers.