Filename Extension Changer
Change the extension on every filename in a pasted list without renaming the base filename.
How to use the Filename Extension Changer
What does the Filename Extension Changer do?
Change the extension on every filename in a pasted list without renaming the base filename; It applies this page-specific rule: changing .jpg to .png in a filename does not convert the image data.
Which inputs does this tool use?
To change the extension on every filename in a pasted list without renaming the base filename, enter Filenames or paths, New extension, Change behavior, Updated filename list; keep every value in the same example; where available, choose between Replace an existing extension or add one, Append after the complete filename to match the required format; select Preview filename changes when the values are ready; Start with a familiar case covered by this rule - Replace mode changes the final extension after the last folder separator, or adds one to an extensionless name - so the expected result can confirm the settings.
How should the tool result be read?
For a result intended to change the extension on every filename in a pasted list without renaming the base filename, replace mode changes the final extension after the last folder separator, or adds one to an extensionless name; read updated filename list together with the original filenames or paths rather than as an isolated answer, and confirm that its units or structure match the intended use.
Does this rename files on my computer?
When the goal is to change the extension on every filename in a pasted list without renaming the base filename, no.
Does renaming an extension convert a file?
When using the page to change the extension on every filename in a pasted list without renaming the base filename, no.
Limits and accuracy
When using this tool to change the extension on every filename in a pasted list without renaming the base filename, windows backslashes and web-style forward slashes are both supported and preserved in the output; check the result in its intended destination before relying on it for important work; keep filenames or paths until the output has been checked in its intended destination.
This tool previews names, not file conversions
Changing .jpg to .png in a filename does not convert the image data. This page only prepares a text list of proposed names. Use an image converter when the actual file format must change.
Replace mode changes the final extension after the last folder separator, or adds one to an extensionless name. A leading period on a dotfile such as .gitignore is treated as part of its name, not as an extension.
Windows backslashes and web-style forward slashes are both supported and preserved in the output.
Frequently asked questions
Does this rename files on my computer?
No. It creates a text preview only.
Does renaming an extension convert a file?
No. A real format converter must rewrite the file's contents.
What happens to .gitignore?
It is treated as an extensionless dotfile, so replace mode adds the new extension after its full name.