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Merge & Organize

Resize PDF Pages to A4 (or Any Size)

Resize PDF pages to A4 — or US Letter, A3, A5, any size you type — with the contents scaled to fit and centered. Perfect for a document with mixed page sizes, or a US file that has to print on A4.

Resize PDF Pages

Settings appear once you add a PDF.

Orientation
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Advanced 2
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Fit

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  • 100% private Your PDFs never leave this device. Everything runs in your browser.
  • No limits No file-size cap, no watermark, no sign-up and no daily quota. Free.
  • Batch ready Add as many PDFs as you like; each one is handled and saved in one go.

How to resize PDF pages to A4

  1. Add your PDFs: Drop the PDF — mixed sizes are fine.

  2. Check the settings: Pick A4, Letter or another size, or type your own. Pages keep their own orientation unless you choose one.

  3. Save the result: Save. Each page’s content is scaled to fit the new size and centered — as vectors, so text stays sharp.

Why it doesn’t upload

Resizing is mostly done to print or submit a document properly — applications, contracts, theses. It’s done here in your browser, so the document doesn’t travel to be reformatted.

Check it in your browser’s Network tab

Worth knowing

  • Links and form fields aren’t carried over to the resized pages.
  • Keeping proportions leaves white bands where the shapes differ (Letter onto A4, for example).
  • Text and graphics are scaled, not re-flowed: a page shrunk a lot has smaller text.

Under the hood

What happens to your file

Each page is embedded as a form XObject — a reusable drawing — and placed on a new page of the size you chose, scaled to fit and centered, with the margin you set. Because the content is drawn, not rasterized, text stays sharp and selectable at any size.

Runs on pdf-lib

Reference: ISO 32000-2 (PDF 2.0)

Why resize PDF pages to A4 or Letter?

Documents made in the US are US Letter; most of the world prints on A4. Send a Letter PDF to an A4 office and pages print with cut-off edges or shrink unexpectedly. Resizing scales each page’s content to fit the new size and centers it, so it prints cleanly everywhere.

It also fixes documents assembled from different sources, where every page is a different size. The resizing happens in your browser; the file isn’t uploaded.

Common reasons to change PDF page size

  • US Letter to A4 (and back)

    Make a document print correctly on the paper the recipient uses.

  • Mixed page sizes

    Unify a merged PDF made from scans, letters and exports into one size.

  • Resizing a scanned PDF without losing quality

    Each scan is placed on the new page as a drawing, not re-rendered, so its pixels stay exactly as sharp — see resize a scanned PDF without blur.

  • Portals that require A4

    Some application and filing systems reject non-standard page sizes.

  • Printing booklets

    Resize to A5 for a booklet or handout.

  • PDFs that print smaller than expected

    Scale pages to the exact paper size so the printer doesn’t shrink them.

Tips for resizing PDF pages

  1. Keeping proportions leaves white bands where shapes differ, like Letter onto A4 — that’s normal and avoids stretching.
  2. Text is scaled, not reflowed, so shrinking a lot makes text smaller.
  3. Use Match each page orientation for documents that mix portrait and landscape pages.
  4. Type a custom size for unusual paper, labels or posters.
  5. To trim margins instead of scaling, use Crop PDF.

Questions

How do I convert a Letter PDF to A4?

Choose A4 and press Resize pages. Each Letter page is scaled to fit A4 and centered, so it prints without anything cut off.

How do I make all pages in a PDF the same size?

Pick one size here. Every page — however big or small it was — comes out that size, with its content scaled to fit.

Does resizing a PDF make the file smaller?

No — it changes the size of the pages, not of the file, which won’t get meaningfully smaller. To get a PDF under an email or upload limit, use Compress PDF.

Why does my PDF print smaller, or cut off at the edges?

Usually because the page size doesn’t match the paper — a Letter PDF printed on A4, or the other way round — and the print dialog is set to shrink it or to print at actual size. Resizing the pages to your paper here fixes it in the file; why a PDF prints differently covers the other causes.

Will resizing make my PDF blurry?

No. Text and vector graphics are scaled as vectors and stay sharp. Photos inside keep their resolution.

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