# Cleaning PDF Files

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<summary>How do I clean PDF in Lite?</summary>

To clean PDF in Lite you have to specify its scale first by marking a known dimension with the dimension line. Then mark the regions you want to generate on, optionally exclude some regions like pillars or core of the building using include/exclude toggle and polygon.rectangle tool. At last, draw the spine of circulation using the circulation tool. Save the progress and you're ready to generate.

</details>

<details>

<summary>How do I ensure the scale is correct in the PDF?</summary>

To ensure your PDF is scaled correctly, it is best to have a confirmed reference dimension of some object in your floor plan, so you can scale the PDF based on that reference. If you don’t know exact dimensions, you can scale your PDF by assuming a default dimensions of some object, fo an instance size of stairwell/bathroom door to be 0.9 m / 3 ft.

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