VToDoc can add handwritten signatures and inserting official seals to PDFs.

1. Handwritten Signature: A signature with a pen tip that is close to the real signature.
2. Official Seal: Remove the background of official seal picture.

The handwritten signature and the official seal picture are all under the "Element" menu, and the element is different from the annotation, which will be added directly to the PDF and cannot be modified after saving. Select the "Element" menu and a toolbar will appear on the top of PDF page.

Handwritten Signature

After clicked the icon to enable the mode, and then click on the position in the PDF that needs to be inserted, and a pop-up window will appear, and the handwriting tablet on the upper part of it can be used for handwriting.

After inserting a handwritten signature, you can also re-select the signature color and move settings such as position, cropping, auto-cropping, rotation/flip direction, transparency, and more.

Official Seal

After clicked the icon to enable the mode, and then click on the position to be inserted in the PDF and select the image of the official seal.
Remove the background
If a company seal picture has background, you can click the icon to remove the background manually.

• Remove Solid Background: This mode removes colors from the image that are close to the chosen color. Click on the position of the image where you need to remove the background color to choose the color, adjust the threshold as needed, and then click "Preview".
  
  
• Remove Complex Background: This mode can preserve the objects that need to be extracted from the picture. Select or smear the area you want to keep/extract, and the tool clears the area outside the smeared area.
  
  

• Reset: Reload the image and clear all actions.
• Preview: Run the current operation to see the effect of the picture.
• Specify Effective Area: Operates only on the selected area.

Element Modification

1. Move up/down layers
   

   Elements are added to the PDF sequentially according to the layer settings, so layers are overwritten from layer to layer.

   
2. Copy
   

   You can copy objects to: All Pages, Odd Pages, Even Pages, Specific Pages. The page numbering rules for the specified pages are as follows:
   Single pages are connected with ",", e.g., "1,3" indicates the first and third pages.
   The range is connected by "-", for example, "1-3" means that the first page to the third page have a total of 3 pages.
   The above two can be freely combined and connected with ",", e.g., "1,3-5" means the first, third to fifth pages.

3. Move
4. Scale
5. Crop
6. Auto-Crop
   

   If the image has a transparent background (e.g. PNG format), click the icon will auto-crop the image by removing the transparent border.
   

7. Flip
8. Rotate
9. Transparency