Question 1

Why convert A4 to Letter (or vice versa)?

Accepted Answer

The US uses Letter (216×279 mm). Most of the world uses A4 (210×297 mm). They're close but not identical — printing a Letter PDF on A4 paper crops the bottom; printing A4 on Letter has wide margins. Resizing fixes both.

Question 2

Does the content stretch?

Accepted Answer

By default the content is scaled proportionally to fit (with white margins if aspect ratios differ). 'Stretch to fill' is also available — useful when you want edge-to-edge but accept slight distortion.

Name	Size (mm)	Region
A4	210 × 297	Worldwide except US/Canada
Letter	216 × 279	US / Canada
Legal	216 × 356	US legal / contracts
A3	297 × 420	Posters, double-A4 layout
A5	148 × 210	Booklets, half-A4
Tabloid	279 × 432	US newspaper format

PDF Page Size Resize

Common page sizes

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