> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/labeling/labeling-tools/tools/pdf-tool.md).
# PDF Tool
Overview of the PDF labeling tool in Ango Hub
The PDF labeling tool allows you to annotate text and arbitrary rectangular areas on PDF documents.
{% hint style="info" %}
The PDF tool is supported across the PDF labeling editor.
{% endhint %}
## How to add a PDF tool to your project
From the project’s *Settings* tab, enter the *Label Set* section.
Click on *Add Category*. From the list that appears, click on *PDF*.
A new row will appear named *PDF*. Click on it to expand it.
Give your PDF tool a title and description.
Enable the *Required* toggle if you want to force labelers to create a PDF label for each asset. When the toggle is disabled, labelers will be able to save and move to the next asset without creating the PDF label.
If you would like to ask labelers further questions, for example, if you want to show a further *radio* after placing a PDF tool, click on *Add Classification* and add a further question. [More on nested questions here](/labeling/labeling-tools/tools/nested-classifications.md).
## How to Label with the PDF Tool
From the *Tools* panel on the left sidebar, select a *PDF* labeling tool, marked with an A enclosed in a square.
With the *PDF* tool selected, click and drag where you’d like the bounding box to be placed.
### OCR
{% hint style="info" %}
By default, targeted OCR only detects English. To change, add, or remove which languages should be detected in your project, head over to *Settings -> General* to do so:\
{% endhint %}
#### Single OCR
To perform OCR on the area you've just drawn, click on the area to select it, then right-click it and click on the *OCR* button to perform OCR.
After performing OCR, Hub will display how confident it is that the OCR results are correct.
#### Group OCR
To perform OCR on a group of annotations at once, hold *Shift* then click on each annotation for which you'd like to perform OCR. Right-click on any one of them and click on *OCR.*
---
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