Fix Handwritten Signature Visible in Adobe Reader but Missing in Acrobat Pro
Question details
A user's handwritten signature created on an iPad is visible in Adobe Reader DC but missing when the file is opened in Adobe Acrobat Pro 2020 on multiple computers.
- Product
- Adobe Acrobat Pro 2020 / Adobe Reader DC
- Device & OS
- iPad and Desktop PCs
- Scenario
- Opening and viewing a signed PDF document on a desktop computer after it was marked up on a mobile tablet.
- Observed behavior
- The handwritten signature displays correctly in Adobe Reader DC but is entirely invisible or hidden in Adobe Acrobat Pro 2020.
Verify exactly which app or tool was used on the iPad to create the handwritten signature (such as Apple Markup or Adobe Fill & Sign) to understand how the signature layer was embedded.
Enable Comments and Layers in Acrobat Pro
The signature may be embedded as a drawing annotation or placed on a hidden layer that Acrobat Pro conceals by default.
Sometimes, annotations made on mobile devices are placed on layers that desktop software filters out. Revealing hidden markup often resolves the missing signature without altering the document.
Launch Adobe Acrobat Pro 2020, open the affected PDF, and click the 'Comments' tool in the right-hand pane to check if the signature is listed as a drawing annotation.
Click the 'Layers' icon on the left navigation pane. Expand the layer tree and ensure all layers (especially annotation layers) have the eye icon visible.
If the signature is still missing, zoom out or select the 'Edit PDF' tool to see if the signature object was accidentally moved entirely outside the page boundaries.
Reapply the Signature Using Fill & Sign
Replacing the problematic iOS markup with a native Adobe signature prevents cross-application visibility issues.
Use WPS Office to Reliably View and Add PDF Signatures
WPS Office offers a highly compatible PDF reader and editor that accurately renders mobile annotations, drawings, and signatures without visibility issues across different software.
- 1. Open PDF in WPS Office: Launch WPS Office and drag your PDF file into the workspace to open it.
- 2. View Annotations: Navigate to the 'Comment' tab to view all embedded annotations, ensuring your mobile signature is visible.
- 3. Add a Signature: Go to the 'Insert' or 'Protect' tab, click on 'Sign', and select 'Create Signature'.
- 4. Place Your Signature: Draw, type, or import an image of your signature, then click exactly where you want to place it securely on the document.
Frequently Asked Questions
Why do iPad signatures sometimes disappear in Adobe Acrobat?
Signatures created using Apple's native iOS Markup or third-party apps are often saved as non-standard image layers or drawing annotations. Acrobat Pro's default viewing preferences might hide these specific annotation layers, making the signature appear missing.
How can I permanently embed an iPad signature so it appears on all computers?
You can 'flatten' the PDF by opening it in an application where the signature is visible (like Adobe Reader DC or a web browser), and choosing the 'Print to PDF' option. This bakes the signature directly into the document's base layer.
Are drawing annotations different from digital signatures?
Yes. A drawing annotation is simply a graphical markup layered on top of the document. A true digital signature contains cryptographic data verifying the signer's identity and locks the document to prevent undetected alterations.
