How to Annotate and Sign a PDF on Android

Add visual notes, highlights, arrows, text and a signature to a PDF using Annotate & Sign, then save a new copy.

By RNK Labs · October 30, 2026 · 4 steps

Screenshots show the English app interface. Translated button names may differ from the labels in the images.

STEP 01 / 04

Choose the document

Open Annotate & Sign under Tools, tap Select PDF and choose your file. The editor opens with a toolbar above the page.

Choose Select PDF to open a document for annotation. Click to enlarge.

STEP 02 / 04

Add notes and highlights

Choose Draw, Highlight, Arrow or Add text in the toolbar. Follow the selected tool’s prompts to place your annotation. Use the page control below the preview to reach another page. Pinch to zoom when you need a closer view.

A highlight has been added to the demo PDF and is selected for adjustment. Click to enlarge.

STEP 03 / 04

Insert and position your signature

Tap Insert signature and follow the signature tool’s prompts. Tap an annotation to select it, drag it to move it and drag a corner to resize it. Use Undo to reverse an unwanted edit. Review the signature’s size and placement before saving.

A nonpersonal demo signature mark is inserted and selected for positioning. Click to enlarge.

STEP 04 / 04

Save a new copy

Tap Save new copy, choose a destination and file name, and confirm. Open the output to check that notes and signatures appear on the intended pages.

The app confirms that the annotations were saved as a new PDF copy. Click to enlarge.

Tips for a better result

Use a copy of your document when practicing.
Make sure annotations do not hide essential text.
Check the recipient’s signature requirements before sending a signed document.

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