Every metadata remover says it works. Few tell you how to check. A tool that quietly leaves the GPS block, the author name or a thumbnail in place is worse than no tool, because it gives you confidence you have not earned. This guide shows a simple test that works for any remover, ours or anyone else’s, and for any file type.
The idea: read both files and compare
Keep the original. Clean a copy. Then read the metadata of both and look at the difference. If the cleaner worked, the second list is short, and every field left in it is something you can explain, such as the image size or the audio length.
Step by step
- Make a copy of the file and clean the copy. Never overwrite your only original.
- Open the Compare Metadata page and choose the original as Before and the cleaned copy as After.
- Read the summary line first: it tells you how many flagged fields are still in the cleaned file. Flagged means a tag that usually points at a person, a device, a program or a place.
- Open the lists. Removed should hold the author, the camera, the dates and the GPS. Still there should hold only technical facts.
- Check the location line. If the second file still records a location, the clean failed for that block.
What a good result looks like
| File | Expected left after cleaning | Should be gone |
|---|---|---|
| JPEG photo | Image size, colour profile, rotation | GPS, camera make and model, serial numbers, dates, software, thumbnail |
| Page count, PDF version | Author, creator program, dates, XMP | |
| Word or Excel file | Page or word counts that the program recomputes | Author, company, last saved by, template path, thumbnail |
| MP3 or M4A | Duration, bit rate, sample rate | Title, artist, album, comment, cover art, encoder |
| MP4 or MOV | Duration, codecs, resolution | GPS, device, creation date, software |
Things that are fine to find
Some fields remain on purpose because the file cannot be opened or displayed correctly without them: the width and height of an image, the colour profile, a rotation flag, the sample rate of audio. These do not identify anyone. Judge each leftover by one question: could this tell a stranger who made the file, with what, when or where?
Things that are not fine
- A GPS position or a place name.
- A serial number for the camera, lens or phone.
- A person’s name in an author, artist, owner or creator field.
- A comment or description you did not write on purpose.
- Dates that show when you took or saved the file, if that matters to you.
For a full list of everything a single file holds, use the File Metadata Viewer. For photos only, the EXIF Viewer runs in your browser and uploads nothing.