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Change PDF to A4 size

Change a PDF file to A4 size online, choose automatic, portrait or landscape orientation, preserve proportions and download a print-ready result.

Exact 210 × 297 mm A4 pagesAutomatic, portrait or landscapePrivate local processing
Use this tool now This tool runs on pdfuae.ae and is measured only under the global site.
Direct answer

How do I change a PDF file to A4 size?

PDFUAE changes every page to the ISO A4 canvas of 210 × 297 mm, scales content proportionally and centres it inside your chosen margin. Keep automatic orientation for mixed portrait and landscape pages, or force one orientation, then open and verify the new PDF before downloading.

Prepared and technically reviewed by PDFUAE · Last reviewed 16 August 2026
Use Change PDF to A4 size nowProcessing starts on this tool page. File names and contents are never sent to analytics.
Drag a file here or choose it from your device
Local processing for the tools shown · 30 MB per file and 80 MB per batch
Ready paths for this task

Start with the outcome you actually need

make a document A4Standardise pages for print in portrait or landscape.

Each option opens the relevant setting in this primary tool.
PDF A4 size converter online

Change a PDF file to A4 size without stretching it

This free converter changes the physical page canvas of every PDF page to ISO A4. Choose automatic orientation to preserve portrait and landscape pages, or force the whole document to one orientation. Content is scaled proportionally and centred inside the margin you select.

A4 portrait210 × 297 mm8.27 × 11.69 in · 595 × 842 pt
A4 landscape297 × 210 mm11.69 × 8.27 in · 842 × 595 pt
US Letter comparison215.9 × 279.4 mmLetter is wider and shorter than A4

What the converter changes

  • The page dimensions become exact A4.
  • Mixed page sizes become one standard paper size.
  • Automatic mode keeps wide pages in landscape.
  • Your selected margin is applied around the content.

What it preserves

  • Every source page remains in the same order.
  • Content keeps its original proportions.
  • Vector text and graphics are not turned into screenshots.
  • The source PDF remains unchanged on your device.

Choose the right A4 setting

Your PDFRecommended orientationWhy
Mixed portrait and landscape pagesAutomatic per pageRetains the natural orientation of each page.
Forms, letters and reportsPortraitCreates a consistent vertical document.
Slides, wide tables or drawingsLandscapeProvides more horizontal space and reduces scaling.
How it works

Convert the file, verify every page, then download

Convert every PDF page to the exact A4 paper size online. Open the tool above, choose your file and follow the settings shown. PDFUAE creates a new result and leaves the original unchanged.

What are the exact dimensions of an A4 PDF page?

A4 portrait is 210 × 297 mm, 8.27 × 11.69 inches or approximately 595 × 842 PDF points. Landscape uses the same dimensions in reverse.

Can I change a US Letter PDF to A4?

Yes. Select automatic or portrait orientation and the tool scales each Letter page proportionally inside an A4 page without stretching it.

Will the text or images be stretched?

No. The default fit method keeps the original aspect ratio, centres the content and adds only the margin you choose.

Does changing a PDF to A4 reduce its file size?

Not necessarily. This tool changes the physical page dimensions, not the file weight. Use the PDF compressor afterwards if you also need a smaller MB or KB size.

Are all pages retained when converting to A4?

Yes. The output contains one A4 page for every source page and the result is reopened to verify the page count.

Is my PDF uploaded to PDFUAE?

No. This A4 conversion runs locally in your browser, so the file content and filename are not sent to analytics.