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What metadata is hiding in your files?
By Himanshu Ranjan · Updated 8 November 2026
Metadata is data about a file that travels inside it. Photos can carry the camera model, the date and GPS coordinates. Office documents and PDFs often store author, company and edit details, and comments can survive in the file. You can read this hidden data on your Mac and remove it before sharing a file.
What metadata is, in plain terms
Metadata is commonly described as data about data. A book's title, author and publication date are metadata about the book. In digital files, the same idea applies, except it is stored inside the file itself and often added automatically by the app or device that created it, without you doing anything.
That is useful for finding and organizing files. It becomes a privacy hazard when the file is shared, because the recipient receives the hidden details along with the visible content. Wikipedia notes that in litigation, metadata can contain sensitive information that is harmful to a party.
Photos: camera, date and location
Photos use a metadata standard called Exif. It can store the make and model of the camera or phone, exposure settings, pixel dimensions, color space, the local date and time the device was set to, and GPS coordinates when the device had a GPS receiver or the photo was geotagged. The same standard can include a preview thumbnail, descriptions and copyright information.
The risk is that this often happens by default. Some services strip Exif data on upload, but others keep it, location included. Wikipedia also notes that some editing software does not update the embedded thumbnail after a crop, so an uncropped version can remain inside the file.
Related: see the existing guide on removing location from photos for the full walkthrough.
Documents, spreadsheets and slides
Word-processing files, spreadsheets, slide decks and PDFs can all embed metadata. Typical fields are the author, the company, the title, creation and modification dates, and the name of the application that produced the file. Collaborative documents may also carry comments and the names of the people who made them, plus tracked changes that still hold the text someone deleted.
A PDF you export from a draft can carry the draft's title and your name even if the pages look clean. If you are sending a file to a client, a court or a competitor, those fields say more than you may intend.
- Author, company and last-saved-by names
- Creation and modification dates
- Application and version that produced the file
- Comments, tracked changes and review history in editable formats
- Title and keywords you or a template filled in
Other places hidden data sits: downloads and extended attributes
macOS also attaches information to files outside the file's own contents. Files you download can carry a quarantine flag and a record of where they came from, and Finder tags and comments are stored the same way. These are extended attributes. They do not usually travel when you email a file, but they can come along when you copy or archive a file in some ways, which is why a clean copy is sometimes useful.
How to read and remove it
On a Mac you can read metadata without extra software; see the separate guide on checking a file's hidden data. To remove it, FileDial has dedicated tools that write a clean copy and leave the original alone.
Image tools: Privacy › Remove location removes GPS only, Privacy › Remove camera info removes camera details, and Privacy › Remove all metadata clears everything while leaving the pixels untouched. For PDFs, Sign & Lock › Remove metadata clears title, author, dates and app names. For Word-processing files, spreadsheets and slides, Privacy › Remove metadata clears author, company and comment authors, and Privacy › Accept changes and remove comments handles tracked changes and comments in documents. For video, Adjust › Remove location & metadata writes a new copy with no re-encoding.
- Select the file or files in Finder.
- Open the dial and choose Privacy (or Sign & Lock for PDFs).
- Run the tool that matches the data you want gone.
- Open the new copy and inspect it to confirm, then share that copy.
Mistakes people make when cleaning files
The most common mistake is cleaning the wrong layer. Cropping a photo hides the part of the picture you cut, but it does not touch the location stored in the file. Renaming a file from Draft v3 to Final changes the visible name but not the author, company or edit dates inside it. Printing to PDF can carry the title of the source document into the new PDF's properties.
Another is trusting a single check. A PDF can have document-level metadata, comments, attachments and hidden text under black boxes, and removing one does not remove the others. For PDFs, Sign & Lock › Sanitize for sending… goes further than Sign & Lock › Remove metadata because it also removes scripts, actions, attachments and comments, and Sign & Lock › Check redactions writes a report of text still hidden under black boxes.
People also forget that messaging apps and websites behave differently. Some strip location on upload and some do not, so assuming the platform will protect you is a gamble. Strip it yourself before the file leaves your Mac, then verify with Preview or Get Info that the details are gone.
Finally, remember that not all metadata is harmful and not all of it is yours to remove. In a business setting, edit history and comments may need to be kept for records, so clean a copy for external recipients and keep the working original. FileDial writes results as a new file beside the original, which supports exactly that habit.
Questions
Does taking a screenshot remove metadata?
A screenshot is a new image, so it will not carry the original photo's location or camera model. It has its own, usually minimal, details, and it still shows everything visible on screen. Crop out anything you do not want shared, and check the screenshot file's details if the exact fields matter to you.
Is metadata always bad?
No. It helps you search, sort and organize your own library, and date taken is how photos line up in order. The issue is only copies you hand to other people. Keep the details in files you own, and strip them from the copies you send, ideally by making a clean duplicate each time.
Does converting a file remove its metadata?
It depends on the tool. Some converters keep metadata and some drop it. FileDial's Convert › Convert to WebP does not keep metadata, while Convert › Make uploadable keeps the date and removes location. Check the output with Preview or Get Info rather than assuming a conversion cleaned the file.
Can I see what a file contains before sending it?
Yes. Preview's Inspector shows image information, including where a photo was taken when that is stored, and Finder's Get Info window shows general details. For PDFs, Sign & Lock › Inspect PDF writes a short text report. The separate guide on checking a file's hidden data walks through each method.