The Hidden Information in Files You Send (And How to Remove It)

Every file you send carries more than what you see on screen. Photos record where and when they were taken and on what camera. Office documents remember who wrote them, who edited them and sometimes text you thought you deleted.

Most of the time nobody looks. But it's worth knowing what's there, especially before sending files to people you don't know or posting them publicly.

Photos: EXIF data

Phone and camera photos contain EXIF metadata. Common fields include:

• Date and time taken
• Camera or phone model
• Lens and exposure settings
• GPS coordinates, often accurate to a few meters

That last one is the one to care about. A photo of something you're selling, taken in your living room, can reveal your home address to anyone who checks the file properties.

Removing it on Windows

1. Right-click the photo and choose Properties.
2. Go to the Details tab.
3. Click Remove Properties and Personal Information at the bottom.
4. Choose to create a copy with all possible properties removed.

On iPhone

When sharing a photo, tap Options at the top of the share sheet and switch Location off. This only affects that share. To stop recording location entirely, go to Settings → Privacy & Security → Location Services → Camera and set it to Never.

On Android

This depends on the phone, but most camera apps have a "location tags" or "save location" setting you can turn off. Google Photos also lets you remove an estimated location when sharing.

On Mac

In the Photos app, select the image, then Image → Location → Hide Location before exporting. Or open it in Preview, go to Tools → Show Inspector, and check the GPS tab, where you can remove location info.

Word, Excel and PowerPoint files

Office documents can contain a surprising amount of extra information:

• Author name and company (pulled from your Office account)
• Names of everyone who edited the file
• Comments, including resolved ones
• Tracked changes, which can show text that was deleted
• Hidden rows, columns and sheets in Excel
• Speaker notes in PowerPoint

Tracked changes are the classic mistake. You negotiate a contract, accept most changes on screen, and send it. The recipient turns on "All Markup" and sees every edit, including your internal notes about what you were willing to concede.

Use Document Inspector

Office has a built-in tool for this:

1. Save a copy of the file first. Some removals can't be undone.
2. Go to File → Info → Check for Issues → Inspect Document.
3. Click Inspect.
4. Click Remove All next to anything you don't want to send.

It finds comments, revisions, document properties, hidden content and more.

PDFs

PDFs have their own metadata: title, author, the software used to create them, and sometimes keywords. Open the file in a PDF reader and look at Document Properties to see what's there.

The bigger PDF risk is bad redaction. Drawing a black box over text in some editors only covers it visually. The text is still in the file and can be copied out. Use a real redaction tool (Adobe Acrobat has one under "Redact"), or as a blunt but reliable fallback, print to PDF as an image.

Screenshots

Screenshots usually carry less metadata than camera photos, but check what's in them. Browser tabs, notification previews, a bookmarks bar, the clock and battery level, and other open windows can reveal more than intended. Crop before sending.

File names

Easy to forget: the file name itself is information. "Smith_offer_lowball_v3.docx" tells the recipient something you might not want them to know. Rename before sending.

A quick pre-send routine

For anything going outside your organization or to a stranger:

• Photos: location off.
• Office docs: Inspect Document, accept or reject all changes, delete comments.
• PDFs: check properties, and use proper redaction.
• Screenshots: crop.
• File name: neutral and descriptive.

None of these steps takes more than a minute, and each one is easy to forget, which is why it helps to have the list.