Duplicate File Name Finder
Find duplicate names in a list of filenames.
Spotting repeated names
Duplicate filenames cause conflicts — a file overwriting another, an upload rejected, confusion about which is which. This finds duplicate names in a list of filenames, so you can spot and resolve clashes before they cause trouble.
Paste your list of filenames to find duplicates.
Why duplicate names matter
Duplicate filenames are a genuine source of problems. When files must have unique names — in a single folder, an upload, or a system that keys on the name — a duplicate causes a conflict: one file silently overwrites another, an operation is rejected, or you end up unsure which version is which. This is easy to miss in a long list of names, where duplicates hide among hundreds of entries. Finding them lets you rename the clashes before they cause data loss or errors. It is useful when preparing a batch of files for upload, consolidating files from multiple sources where names might repeat, or checking a naming scheme actually produces unique names. Note this compares the names themselves, which is what matters for name conflicts, rather than the file contents — two files with the same name are a clash regardless of what is inside them, and that is exactly the problem worth catching early.
Common questions
Why do duplicate filenames cause problems?
When files need unique names, a duplicate causes a conflict — one file overwriting another, an operation rejected, or confusion about which is which.
Does it compare names or contents?
Names — which is what matters for name conflicts. Two files with the same name clash regardless of what is inside them.
Is anything uploaded?
No. The check happens in your browser.