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Convert PDF to A4 Online

Standardize every page of a PDF to A4 — the paper size used across Europe and most of the world outside North America. Useful when a document was assembled from pages of different sizes, was built for US Letter and needs to go to an A4 recipient, or just needs one consistent size before printing or archiving. Fit keeps every page fully visible on the A4 sheet; Fill fills the sheet edge to edge.

Your files are processed locally and are not uploaded.

Choose your PDF

Drag and drop a PDF file here

or

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Accepted: a PDF file

Processed locally. Files are never uploaded.

A4 settings

Add a valid PDF on the left to choose orientation, Fit or Fill, and alignment.

Add a valid PDF above to turn this on.

Before processing

  • File must be a valid PDF
  • At least one page must be selected
  • Any margin entered must leave room for page content

How to use Convert PDF to A4

  1. 1
    Upload your PDF
  2. 2
    Choose all pages or select specific ones
  3. 3
    Pick orientation and Fit or Fill
  4. 4
    Download the standardized A4 file

Real use cases

Preparing a document for a printer or archive that expects A4

Converting a US Letter-sized PDF for a European recipient or online form

Standardizing scanned pages from mixed sources into one consistent A4 size before combining them

Benefits

Every page becomes exact A4 — 595.28 × 841.89 points (210 × 297mm)

Automatic orientation matches each page's own shape, or force portrait/landscape

Fit keeps everything visible; Fill removes empty space by cropping evenly

Optional inside margin, with no image ever uploaded to a server

Privacy by architecture

How browser-based processing works here

Each selected page is redrawn — as vector content, not a rasterized image — onto a new A4 page directly in your browser's memory. Pages you don't select are left completely untouched. Nothing about your document is ever transmitted anywhere.

  • No file upload endpoint exists on this page
  • No database or server-side file storage
  • Output is generated locally as a browser Blob file

Supported files: Standard, non-encrypted PDF files. Encrypted or password-protected PDFs aren't currently supported.

Honest limitations

  • Pages keep their original proportions — there is no option to stretch or distort a page to fill A4 exactly.
  • Interactive form fields, annotations, comments, links, and bookmarks are not preserved on a converted page — only its visible vector content and images are redrawn onto the new A4 page.
  • Very high page counts (200+) can take noticeably longer on older phones.

No artificial daily task limits. Processing capacity depends on your device, browser, file size, and page count.

Troubleshooting

My content looks smaller after converting to A4

That's Fit preserving your full page with empty margins around it, usually because the source page had different proportions than A4. Switch to Fill if you'd rather have content reach every edge (it may crop slightly).

I need A4 in millimeters or inches, not points

A4 is 210 × 297mm (8.27 × 11.69in) — the PDF itself stores this internally as 595.28 × 841.89 points, which is what every PDF viewer and printer reads correctly regardless of the units you think in.

Some pages ended up landscape and others portrait

That's automatic orientation matching each source page's own shape. Choose Portrait or Landscape instead of Auto to force every converted page to the same orientation.

Related tools

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Convert PDF to US Letter

Convert any PDF to standard 8.5 x 11in US Letter size.

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Add Margins to PDF

Add whitespace around every page for printing or binding.

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Frequently asked questions

What is A4 size in mm and inches?

A4 is 210 × 297mm, or 8.27 × 11.69 inches — the international standard paper size (ISO 216) used across Europe, Asia, and most countries outside North America.

What's the difference between A4 and US Letter?

A4 (210 × 297mm) is taller and narrower than US Letter (8.5 × 11in / 215.9 × 279.4mm). Content sized for one won't align perfectly on the other, which is why converting matters when sending a document across regions.

Will converting to A4 crop or distort my content?

Fit never crops or distorts — it scales your page to fit fully inside A4, preserving its proportions. Fill scales to cover the entire A4 sheet, which may crop a small amount from the longer edge, but never stretches or distorts.

Can I convert only some pages to A4?

Yes — select specific pages and only those are resized to A4; every other page is copied through completely unchanged.

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