How is this different from the File Extension Finder?

File Extension Finder looks up what an extension you already know MEANS — its file type and typical MIME type. This File Extension Extractor does the opposite: it PULLS the extension out of actual file names you provide, without explaining what that extension is used for.

How are file names with multiple dots handled, like archive.tar.gz?

Only the text after the very last dot is treated as the extension, so archive.tar.gz correctly extracts "gz", not "tar.gz".

What happens if a file name has no dot at all?

It's shown as having no extension rather than causing an error, and it's grouped under "(no extension)" in the summary.

File Extension Extractor

Extract the extension from a file name or list of file names, correctly handling multi-dot names, with a summary count by extension.

File Name(s) — one per line

Extracted Extensions

archive.tar.gz

.gz

report.docx

.docx

README

—

photo.JPG

.jpg

notes.txt

.txt

Summary by Extension

.gz

1

.docx

1

(no extension)

1

.jpg

1

.txt

1

How to Use the File Extension Extractor

Paste a file name, or a list of file names one per line, and the tool pulls out just the extension — everything after the LAST dot in the name. Files with multiple dots (like archive.tar.gz) correctly return only the final segment (gz), and file names with no extension at all are handled gracefully rather than producing an error.

Example

archive.tar.gz → gz, report.docx → docx, and README (no dot) → no extension. The summary panel then shows how many files in your list share each extension.

Common Use Cases

Auditing a folder listing to see the mix of file types it contains.
Pulling extensions out of a batch of file names before filtering or sorting them.
Checking that multi-dot file names like archives are parsed correctly before processing.

FAQs

How is this different from the File Extension Finder? File Extension Finder looks up what an extension you already know MEANS — its file type and typical MIME type. This File Extension Extractor does the opposite: it PULLS the extension out of actual file names you provide, without explaining what that extension is used for.
How are file names with multiple dots handled, like archive.tar.gz? Only the text after the very last dot is treated as the extension, so archive.tar.gz correctly extracts gz, not tar.gz.
What happens if a file name has no dot at all? It's shown as having no extension rather than causing an error, and it's grouped under "(no extension)" in the summary.

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