How to add a signature to a PDF

Updated Sep 12, 2023
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Signatures added to PDFs through this feature are legally-binding.

You can self-sign PDFs while editing them on or the Dropbox mobile app. Using this feature will link your Dropbox Sign and primary Dropbox accounts if both are under the same email address. If you don’t already have a Dropbox Sign account, self-signing a PDF will create a Basic account under the email affiliated with your Dropbox account.
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Note: This feature is for self-signing only. 

How to add a signature in a PDF on

  1. Log in to
  2. Click the name of the PDF file you’d like to sign.
  3. Click Edit above the file preview. This will open the editing mode.
  4. Click Sign above the file preview. 
  5. Add your signature. 
    • To draw a signature, click Draw from within the Sign toolbar. Add your signature using your mouse or mousepad. 
    • To type your signature, click Type, then type your name. To change the signature font, click Change font in the lower left of the signature window.
    • To upload your signature, click Upload. Click Upload Photo to make a selection from your desktop or Dropbox files. 
      • Note: Signature photos must be smaller than 40MB and must be one of these file types: .png, .jpg, .jpeg, .bmp, or .gif.
  6. Click Insert to add your selected signature option to the PDF. 
  7. Click Done.
    • Your edited PDF will be saved as a new file within your Dropbox account. Anyone with access to the original file won’t see the changes.
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Note: In highlighted PDFs saved after signing, some highlighted text may appear redacted instead of highlighted. PDFs without highlighting will save as expected upon signing. 

How to add a signature to a PDF on the Dropbox mobile app 

iOS and Android

  1. Open the Dropbox mobile app.
  2. Navigate to the PDF you’d like to self-sign.
  3. Tap the PDF to open a preview.
  4. Tap Edit/Sign in the lower left.
  5. Choose Only you.
  6. Tap Add signature.
    • If you don’t have a saved signature, draw your signature under Sign your name.
    • If you have a saved signature, tap the desired signature under Select signature.
    • To add a saved signature, tap + (plus sign) next to Edit signature, draw your new signature, then tap Done.
    • To edit your saved signatures, tap Edit next to Select signature.
  7. Move and resize your signature to the desired area.
  8. Tap Save.
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