Duplicate Filename Finder

By default, matching is case-insensitive and ignores leading/trailing whitespace, so "Report.pdf" and "report.PDF" are treated as the same name. Enable "Case-sensitive" to distinguish them, or "Ignore extensions" to compare names without their extensions.

The tool shows summary stats (total names, unique names, duplicate groups, duplicate instances) and lists each duplicate group with its occurrence count and every instance of the name, so you can see at a glance which files collide.

Yes — Copy Report copies the full text summary, and Download Report saves it as a .txt file you can keep alongside the folder you are cleaning up.

It filters the results by how many times a name must appear to be reported. The default is 2+ (any duplicate), but you can raise it to 3+, 4+, or 5+ to focus only on the most severe collision cases.

No. This tool finds duplicate filenames in a list you provide. It does not compare file contents — two identically named files in different folders may still contain different data. For content-level deduplication you would need to compare checksums, which the File Checksum Generator can help with.

No. The analysis runs entirely in your browser. Paste a list or upload a text file and everything is processed locally, fully offline.