The fastest way depends on what software you have

Deleting a signature from a PDF takes different steps depending on whether you use Adobe Acrobat (the paid version), a free online tool, or your operating system's built-in PDF reader. Adobe Acrobat Pro gives you the most control and works the same way on Windows and Mac. Free online tools like Smallpdf or ILovePDF work in any browser but upload your file to their servers. Your computer's native PDF reader—Preview on Mac, or Microsoft Edge on Windows—can delete signatures in some cases but with limitations.

The method also depends on how the signature was added. A signature drawn or typed directly into the PDF is easier to remove than one that was digitally certified, which locks parts of the document. If the signature is certified, removing it may invalidate the document's legal status, so check with whoever sent it to you before proceeding.

Key Takeaways

  • Adobe Acrobat Pro lets you select and delete any signature with the Edit tool, and the process takes under a minute once you open the file.
  • Free online tools like Smallpdf upload your PDF to their servers, so use them only if you are comfortable with that trade-off and the file contains no sensitive information.
  • Mac's Preview app can delete signatures by selecting them and pressing Delete, but Windows' Edge browser cannot edit PDFs this way.
  • Certified or digitally signed PDFs may become invalid if you remove the signature, so contact the sender first if the document has legal weight.
  • If you need to remove a signature from many PDFs, Adobe Acrobat Pro's batch processing saves time, but free tools do not offer this feature.

Deleting a signature in Adobe Acrobat Pro

Open the PDF in Adobe Acrobat Pro and go to the Tools menu, then select Edit PDF. Click the Edit tool (the pencil icon) in the toolbar. Your cursor will change, and you can now click directly on the signature to select it. Once selected, press Delete or Backspace to remove it.

If the signature does not select, it may be part of an image or a certified signature. Try clicking the signature with the Select tool (the arrow icon) instead. If it still will not select, the signature is likely locked as part of the document's certification, and you will need to contact whoever signed it to get an unsigned version.

Save the file after deletion. Use File > Save to overwrite the original, or File > Save As to keep a copy with a different name. Acrobat Pro works the same way on Windows and Mac, so the steps do not change between systems.

Using free online tools to remove signatures

Smallpdf, ILovePDF, and similar services let you upload a PDF, edit it in your browser, and read the result without installing software. Go to the tool's website, click the upload button, and select your PDF file. The file uploads to their servers, and you can then use their editor to select and delete the signature.

Most of these tools work similarly: click the signature to select it, then press Delete or click a delete button. read the edited PDF when you are done. The whole process usually takes two to three minutes.

The trade-off is privacy. Your PDF sits on someone else's server during editing, and while most services claim to delete files after an hour or a day, you cannot be certain. Do not use online tools for PDFs containing passwords, financial information, medical records, or anything else you would not want exposed. For sensitive documents, use Adobe Acrobat Pro or your computer's native tools instead.

Removing signatures on Mac with Preview

Mac's Preview app can delete signatures if they were added as annotations or drawn directly into the PDF. Open the PDF in Preview, then click the Markup Toolbar button (the toolbox icon) in the top right. Look for the signature in the document and click it once to select it. Press Delete or Backspace to remove it.

If the signature does not select, it may be embedded as part of the document's content rather than as an editable annotation. In that case, Preview cannot remove it, and you will need to use Adobe Acrobat Pro or an online tool instead.

Save the file after deletion by pressing Command+S. Preview will overwrite the original file unless you choose File > Duplicate first to create a backup.

Why Windows Edge cannot delete signatures the way Mac Preview can

Microsoft Edge on Windows can open and view PDFs, but it does not have built-in editing tools to select and delete content. You can annotate a PDF in Edge by adding your own notes or highlighting, but you cannot remove existing signatures or other elements.

If you are on Windows and do not have Adobe Acrobat Pro, your best options are a free online tool or downloading a free PDF editor like PDFtk or Inkscape. PDFtk is command-line software that requires typing commands, so it is not the easiest route for most people. Inkscape is a drawing program that can open PDFs and lets you select and delete elements, though the interface is more complex than Acrobat Pro.

Batch removing signatures from multiple PDFs

If you need to remove the same signature from dozens of PDFs, Adobe Acrobat Pro's batch processing feature saves hours of manual work. Go to Tools > Action Wizard, then click Create New Action. Set up a sequence that opens each PDF, deletes the signature using the Edit tool, and saves the file. Run the action on a folder of PDFs, and Acrobat will process them all without you clicking through each one.

Free online tools do not offer batch processing, so you would have to upload and edit each file individually. If you regularly remove signatures from multiple documents, the cost of Acrobat Pro pays for itself in time saved.

What to do if the signature is certified or locked

Some PDFs have digitally certified signatures that lock the document and prevent editing. If you try to delete a certified signature and the document will not let you, the signature is protecting the file's integrity. Removing a certified signature may invalidate the document legally, so contact whoever sent it to you and ask for an unsigned version instead.

If you absolutely must remove a certified signature, Adobe Acrobat Pro can do it, but the document will show that it has been altered. The recipient will see a warning that the signature is no longer valid. Use this option only if you have permission from the person who signed it.

Frequently Asked Questions

Can I undo a signature deletion?

Yes, if you have not saved the file yet. Press Ctrl+Z (Windows) or Command+Z (Mac) to undo the deletion. If you already saved the file, the deletion is permanent unless you have a backup copy. Always save a copy before making changes you might regret.

Will deleting a signature change the document's file size?

Usually yes, but not always by much. A signature is stored as data within the PDF, so removing it reduces the file size slightly. The reduction is typically a few kilobytes, so it will not make a noticeable difference unless the PDF contains many signatures.

What if the signature is an image pasted into the PDF?

If someone took a screenshot of a signature and pasted it as an image, you can still delete it the same way: select it with the Edit tool and press Delete. The process is identical whether the signature is a drawn annotation or an embedded image.

Can I delete just part of a signature?

Most tools delete the entire signature as one object. If you need to remove only part of it, you would need to use a more advanced tool like Inkscape or Photoshop, which let you edit PDFs pixel by pixel. For most purposes, deleting the whole signature is simpler and sufficient.

Is it legal to remove someone else's signature from a PDF?

That depends on the document and your relationship to it. Removing a signature from a document you own or have permission to edit is fine. Removing a signature from someone else's document without permission could be fraud or forgery, depending on the document's purpose. If you are unsure, ask the person who signed it or the document's owner before proceeding.