Why does a tool say "file format not supported"?
Each tool is built to accept specific file types, listed on its page. This error means the uploaded file doesn't match any of them.
Common causes
- Wrong file type entirely — trying to use a PDF tool with a Word document, for instance.
- Renamed extension — a file whose extension was manually changed without actually converting its content.
- Unusual variant — some formats have several sub-types a tool might not cover (HEIC vs JPG, for example).
The fix
Check what format the tool actually accepts (shown on its page), and convert your file to that format first using the appropriate converter tool before uploading it to the tool you originally wanted.
If you are not sure what format your file actually is
Check the file's properties on your device (right-click → Properties on Windows, or Get Info on Mac) rather than trusting the file name alone, since extensions can be wrong.
A quick way to confirm the actual file type
On a computer, right-click the file and check its properties — this shows the true file type detected by the operating system, which is more reliable than trusting a file name that may have had its extension changed manually at some point.
Converting between formats
Once you know your file's actual format and the tool's accepted formats, browse the site's tools by category to find the specific converter you need — most common format pairs (PDF, Word, image formats, video formats) have a dedicated direct converter.
A note on very new or unusual file extensions
Occasionally a very new camera, app or device produces a file in a format not yet widely supported anywhere, not just by this site's tools — in that case, checking the device manufacturer's own export or conversion options first is worth trying before assuming a converter tool should handle it.
