Annotate PDF on iOS

UPDF is a powerful iOS application that allows users to annotate and sign PDF documents on their iOS mobile devices efficiently. Combined with the ability to import files from diverse sources, this effectively gives you complete mobility to handle any document workflow easily from your iPhone or iPad.

How to Annotate PDF

Selecting annotation tools

Import a PDF by tapping the "+" symbol in the bottom-right corner or choosing any existing PDF files.

1.1 Annotate with Drawing tools

On the Toolbar, tap the Draw icon.

Below, you'll see a banner displaying all drawing tools. You can select from a pen marker, highlighter, dotted line marker, an eraser.

Tap any of the icons, the default color effects will be displayed next to these tools. To change the color, click the color icon next to the corresponding tool and you can view a detailed screen of that drawing tool.

You can enable the Smart Brush tool, so the marks you make will automatically become straight lines, making your annotations cleaner and more professional.
You can then adjust the marker’s thickness, transparency, and color according to your preference. If the default colors provided by UPDF do not meet your needs, you can tap the palette icon on the far right. It will show a color grid, you can then choose the color from the grid.

Apply the annotations to your document.
If you need to copy or delete multiple annotations in the document at once, we recommend tapping the Hand Icon at the bottom toolbar, selecting the area containing the annotations you want to copy or delete, and then tapping Copy or Delete.

Tap the "..." symbol on the top-right corner of the screen and tap Save to save your changes.

1.2 Annotate with Markup tool

Tap the Comment Icon on the bottom-left corner of the screen.

Below, you'll see a banner displaying all annotating tools. You can select from highlight, strikethrough, underline, and squiggly line.

Tap any of the icons, the default color effects will be displayed next to these tools. To change the color, click the color icon next to the corresponding tool and you can view a detailed screen of that markup tool.
You can then adjust the opacity and color according to your preference.

Apply the annotations to your document and save your changes.

1.3 Annotate with Text tool

Tap the Comment Icon on the bottom-left corner of the screen.

Below, you'll see a banner displaying all annotating tools. You can select any text tool from the given options: text comment, text box, text callout.

Tap any of the icons, the default color effects will be displayed next to these tools. To change the color, click the color icon next to the corresponding tool and you can view a detailed screen of that text tool.
You can then adjust the typeface, font size, border thickness, opacity, text color, border color, and background color according to your preference.
Apply the annotations to your document and save your changes.

1.4 Annotate with Shape tool

Tap the Draw Icon on the bottom-left corner of the screen.

Below, it then opens another menu, showing you multiple shapes and arrows, including a circle, square, straight line, and arrow.

The default color effects will be displayed next to these tools. To change the color, click the Color icon next to the corresponding tool. You can then customize the border thickness, opacity, line style, and fill all the shapes with color.

If the default colors provided by UPDF do not meet your needs, you can tap the palette icon on the far right. It will show a color grid, you can then choose the color from the grid.

After selecting your desired color, you can tap on the screen wherever you want to add the shapes. When you need to add multiple shapes, UPDF makes it easy for you. Simply select the corresponding shape icon, then tap anywhere on the screen — UPDF will automatically add the shape for you without requiring manual placement. After the shapes are added, you can manually adjust their size as needed, greatly improving your efficiency.

If you need to copy or delete multiple annotations in the document at once, we recommend tapping the Hand Icon at the bottom toolbar, selecting the area containing the annotations you want to copy or delete, and then tapping Copy or Delete.

Apply the annotations to your document and save your changes.

1.5 Annotate with Note

Tap the Comment Icon on the bottom-left corner of the screen.

Below, tap on the Sticky Note Icon, and click the Color icon next to the Note Icon. You can choose the style of the sticky notes you want to add and change the color to your liking.