Duplicate File Finder

Detect byte-identical duplicates locally; matching filenames alone are not treated as duplicates.

Choose files to compare

0Files

0Duplicate groups

0 BDuplicate bytes beyond one copy

SHA-256Comparison

Choose multiple filesSame filename is not enough: candidates are grouped by size then verified with SHA-256 over the full file bytes.

Local duplicate scan: size pre-group → SHA-256

Group selected files by byte size first, then hash only possible duplicates locally. Export duplicate groups without uploading file contents.

Select files

—Files

—Files hashed

—Duplicate groups

—Duplicate bytes

Group	File	Bytes	SHA-256

File handling notes

connects ZIP creation/extraction, archive inspection, GZIP, TAR/TAR.GZ extraction, ZIP merging, multi-ZIP extraction, splitting/joining, duplicate detection, renaming, folder summaries, file inventories, and file-type inspection without requiring a file upload where the browser APIs support the task.

Archive and safety boundaries

Browser memory can limit very large files. TAR extraction supports ordinary TAR/USTAR regular files and directories rather than every PAX/sparse/link edge case. Password-protected or uncommon ZIP compression methods can exceed JSZip support. Normalized download paths do not grant arbitrary filesystem write access.