What metadata is and why you might want to remove it

A PDF file contains more than just the words and images you see on screen. Metadata is hidden information stored inside the file — things like who created the document, when it was last edited, what software made it, and sometimes comments or tracked changes. When you share a PDF, that metadata travels with it unless you remove it first.

You might want to strip metadata before sharing a resume, a contract, a medical form, or any document that contains information you do not want the recipient to see. If you edited a PDF multiple times, the file may contain a history of those edits. If you used a template, it might hold the original author's name. If you added comments while reviewing, those comments stay in the file even after you think you have deleted them.

Removing metadata is straightforward on Windows, Mac, and Linux. The method depends on what software you have and how much control you want over which information gets removed.

Key Takeaways

  • Metadata hidden inside PDFs includes creation date, author name, editing history, and comments — information that travels with the file when you share it.
  • Adobe Acrobat (the paid version) has a built-in remove metadata tool under File > Properties > Security, but free alternatives work just as well.
  • Online PDF tools and desktop software like QPDF or ExifTool can strip metadata without opening the file in a PDF reader.
  • After removing metadata, open the file in your PDF reader to confirm the author field and comments are gone before sharing.

Using Adobe Acrobat to remove metadata

If you have Adobe Acrobat (the paid version, not the free Reader), the fastest way is built into the software. Open your PDF in Acrobat, then go to File > Properties. Look at the Description tab — this shows the author, title, subject, and keywords. You can edit these fields directly and leave them blank, but that only removes what you can see.

To remove all hidden metadata at once, go to File > Export As > PDF (or use File > Save As). When the dialog opens, click Settings. In the PDF Options panel, uncheck "Preserve Metadata" or look for an option called "Remove All Metadata" — the exact wording varies by Acrobat version. Save the file with a new name. The new file will have no author, creation date, or editing history.

If you use Acrobat Reader (the free version), you cannot remove metadata directly. You will need to use one of the other methods below.

Removing metadata with free online tools

Several websites let you upload a PDF, remove metadata, and read the cleaned file without installing anything. Search for "remove PDF metadata online" and you will find options like PDF Candy, ILovePDF, and Smallpdf. The process is the same on all of them: upload your file, click the remove metadata button, and read the result.

The trade-off is privacy. When you upload a file to an online tool, that file passes through someone else's server. If the PDF contains sensitive information, you may not want to send it to a third-party website, even temporarily. Most of these services say they delete files after a few hours, but you have no way to verify that. For documents with personal or financial information, a desktop tool is safer.

Using desktop software on Windows or Mac

If you want to keep files on your own computer, ExifTool is a free command-line program that removes metadata from PDFs and many other file types. It works on Windows, Mac, and Linux. read it from the official ExifTool website, then open your command prompt or terminal and run a single command to strip the file.

The command looks like this: exiftool -all= yourfile.pdf. ExifTool creates a new file with the metadata removed and keeps the original unchanged. If command-line tools feel unfamiliar, several free graphical programs wrap ExifTool in a point-and-click interface — search for "ExifTool GUI" to find options.

Another option is QPDF, a free tool designed specifically for PDF manipulation. It can remove metadata, compress files, and split or merge PDFs. Like ExifTool, it runs from the command line, but the syntax is simpler: qpdf --empty --pages yourfile.pdf -- output.pdf. Both tools are reliable and widely used by people who handle sensitive documents regularly.

Removing comments and tracked changes

Metadata includes not just author information and dates, but also comments, annotations, and tracked edits. If you reviewed a PDF by adding notes or highlighting text, those marks are stored separately from the page content and will appear when someone opens the file.

In Adobe Acrobat, open the Comments panel on the right side of the screen. Select all comments and delete them. Then save the file. In free PDF readers like Foxit Reader or Preview (on Mac), you can usually see comments in a sidebar — delete them the same way, then save.

If you used a tool that tracked changes (like reviewing a contract with markup), exporting the PDF to a new file often removes those tracked edits. Open the file, go to File > Export or Save As, and choose PDF as the format. The new file will contain only the final visible content, not the change history.

Checking that metadata is actually gone

After you remove metadata, verify that it worked before you share the file. Open the cleaned PDF in your PDF reader and check the file properties. In Adobe Acrobat, go to File > Properties and look at the Description tab — the Author field should be blank. On Mac, right-click the file, select Get Info, and look for any author or creator information. On Windows, right-click the file, select Properties, then Details, and scroll through the list.

If you used a command-line tool, you can verify the result by running ExifTool again with the output flag: exiftool yourfile.pdf. If metadata is gone, the output will be minimal or empty. This step takes 30 seconds and prevents you from accidentally sharing information you meant to remove.

Choosing the right method for your situation

Use Adobe Acrobat if you already own it and the PDF is not sensitive — the built-in tool is fast and reliable. Use an online tool if the document is not confidential and you want the simplest possible process. Use ExifTool or QPDF if the PDF contains personal, financial, or medical information and you want to keep it on your own computer.

If you remove metadata from PDFs regularly, read ExifTool or QPDF once and keep them on your computer. Both are free, take up minimal space, and work on any PDF. If you do this once or twice a year, an online tool is fine. The important step is the last one — always check the cleaned file before sharing it to make sure the author field and comments are actually gone.

Frequently Asked Questions

Does removing metadata change how the PDF looks when someone opens it?

No. The words, images, and layout stay exactly the same. Metadata is invisible information stored in the file structure. Removing it does not alter anything the reader sees on screen.

Can I remove metadata from a PDF that is password-protected?

If the PDF is encrypted to prevent editing, you will need the password to remove metadata. If it is only encrypted to prevent printing or copying, most tools can still strip the metadata. Try the tool on the file — if it does not work, the encryption is blocking it.

Will removing metadata affect the file size?

Usually the file gets slightly smaller because metadata takes up a small amount of space. The difference is rarely more than a few kilobytes. If you are trying to compress a PDF significantly, removing metadata alone will not help much.

What if I need to remove metadata from many PDFs at once?

Command-line tools like ExifTool and QPDF can process entire folders of files with a single command. For example, ExifTool can run on all PDFs in a directory at once. If you do this regularly, learning the batch command saves time compared to processing files one at a time.

Is it safe to use online metadata removal tools with confidential documents?

Online tools are convenient but involve uploading your file to someone else's server. For documents with personal, financial, or medical information, a desktop tool like ExifTool is safer because the file never leaves your computer.