Fix PDF Pack Sign-In and Scanned Signature Upload Issues
Question details
The user is unable to sign in to PDF Pack or upload a scanned signature to sign a PDF document.

- Product
- PDF Pack
- Device & OS
- not provided
- Scenario
- Attempting to sign a confidential document using a scanned signature or retracing a previous signature under a deadline.
- Observed behavior
- The system fails to upload or retrace the scanned signature, and occasionally blocks the user from signing in, preventing the document from being signed.
Verify that your internet connection is stable for sign-in processes, and ensure your scanned signature is saved in a standard image format (like JPG or PNG) with a small file size.
Contact Support for Document-Specific Investigation
Use this method when PDF Pack persistently rejects a specific document or signature image due to unknown internal errors.
In some cases, specific document encryptions or corrupted PDF structures can prevent signature tools from working correctly. Reaching out directly to the support team with the problematic file allows them to diagnose backend issues.
Ensure you have saved a copy of the specific PDF document that is failing to accept the signature.
Attach the problematic PDF document to an email and send it directly to the customer support address provided by the PDF Pack service.
Include a brief description of the upload or retracing error, and paste the link to your original forum post or support ticket for quick reference.

Optimize the Scanned Signature Image
Use this solution if the service rejects your signature image during the upload process.
Easily Sign PDFs and Upload Signatures with WPS Office
If cloud-based tools like PDF Pack are blocking your sign-in or failing to upload your signatures, switch to WPS Office. The integrated PDF editor allows you to quickly upload scanned signatures and sign confidential documents locally without requiring constant internet access.
- 1. Open your PDF in WPS Office: Launch WPS Office on your computer and open the PDF document you need to sign.
- 2. Navigate to the Signature tool: Click on the 'Insert' tab located in the top ribbon, then select the 'Sign' or 'Signature' option from the menu.
- 3. Upload your scanned signature: Click on 'Create Signature', choose the 'Image' upload option, and browse your computer for your scanned signature file (JPG or PNG).
- 4. Place and save: Click anywhere on the PDF page to place your signature. You can drag the corners to adjust the size, then save your signed document.

Frequently Asked Questions
Why does my scanned signature fail to upload to PDF Pack?
Upload failures typically happen if the signature image exceeds the maximum allowed file size, is saved in an unsupported file format (like TIFF or BMP), or if there is a temporary network connection issue with the cloud service.
What is the best image format for a scanned PDF signature?
The PNG format is generally the best choice for scanned signatures because it supports transparent backgrounds. This ensures your signature blends naturally into the document without a white rectangular box around it. JPG is also widely supported.
Is it safer to sign confidential documents offline?
Yes. When handling highly sensitive or confidential documents, using offline desktop software like WPS Office prevents your private files from being uploaded to remote cloud servers, offering an extra layer of data security.




