PDFPuddle Tool

Resize PDF — Change Page Size Free

Change the page size of any PDF. Resize to a standard preset like A4, Letter, or Legal, or set a custom width and height in mm, cm, inches, or points. PDFPuddle scales the page content to fit the new dimensions using pdf-lib — entirely in your browser, with an option to preserve the aspect ratio so nothing is stretched.

Open Resize PDF →
No file uploads No account required Free to use Private & secure

When do you need to resize a PDF?

PDFs are often created at the wrong page size — a US Letter document that needs to print cleanly on A4 paper, slides exported at an odd dimension, or a scan that needs to match a standard format. Resizing rescales the page so it fits the target size correctly, avoiding clipped content or unexpected margins when printing or combining documents. PDFPuddle does this client-side: your file never leaves your device.

How to resize a PDF

  1. 1Open Resize PDF in PDFPuddle.
  2. 2Upload your PDF.
  3. 3Choose a preset (A4, Letter, Legal, A3, A5, Tabloid) or switch to a custom size and enter the width and height in your preferred unit.
  4. 4Leave Keep aspect ratio on to fit without distortion, then click Resize PDF and download.

All processing happens locally in your browser — no files are uploaded to any server.

Common Uses

Converting a Letter-size document to A4 for printing, standardizing scanned pages to a common size, resizing an exported presentation to fit a specific paper format, preparing a PDF to match the page size of another document before merging.

Frequently Asked Questions

Does resizing scale the content or just the page box?
It scales the content to fit the new page size, so text and images grow or shrink with the page rather than being cropped.
Will resizing distort my pages?
Not if you keep the "Keep aspect ratio" option on. The content is scaled uniformly and centered, with any leftover space added as even margins. Turn it off to stretch content to exactly fill the new dimensions.
What units can I use for a custom size?
Millimeters, centimeters, inches, or PDF points (72 points = 1 inch).
Is it private?
Yes. Resizing runs entirely in your browser — nothing is uploaded.

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