Resize PDF

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Overview

Change a PDF's page size to fit any standard

Resize PDF changes a PDF's page size in your browser — to A4, Letter, Legal, A3, A5, or Square — and lets you choose how the content fits the new page. Pick a size, a fit mode, and optional margin, then download. Nothing is uploaded to a server.

Load your PDF and pick a Target Page Size: A4, US Letter, Legal, A3, A5, or Square, plus Portrait or Landscape. The important part is how your existing content adapts to the new canvas, controlled by Content Layout Behavior: Fit scales it proportionally to fit with no distortion (leaving even margins), Shrink does the same but never enlarges a smaller page (avoiding blur), Stretch fills the whole page edge to edge (which can distort), and Center keeps the content at its original size in the middle of the new page. A margin slider adds breathing room, and a background colour fills any space left by the new aspect ratio.

A live preview shows the result, and you can resize all pages or just the ones you select in the thumbnail strip — handy when only one oversized chart needs fixing. Click Apply & Download to save the resized PDF.

Two honest notes. First, this changes page dimensions, not file size — if you want a smaller file, use Compress PDF. Second, scaling is vector-based via the PDF engine, so text and shapes stay sharp; only Stretch intentionally distorts, and enlarging a low-resolution scanned page can still look soft. Your original file is left unchanged.

Use Cases

When resizing helps

Guide

How to resize a PDF

Step 1: Upload your PDF

Drag it into the drop zone or click Select PDF. Pages appear in the thumbnail strip with a live preview.

Step 2: Choose pages

Use Select All to resize the whole document, or click specific thumbnails to target just those.

Step 3: Set size and fit

Pick a Target Page Size and Orientation, then a Content Layout Behavior (Fit, Shrink, Stretch, or Center). Adjust the Margin slider and Background Color if needed.

Step 4: Apply and download

Click Apply & Download PDF to save the resized file.

Realistic example. You have a US Letter report a European office needs as A4. Click Select All, choose A4, Portrait, Fit (so nothing distorts), leave the margin at 0, and Apply & Download — a clean A4 version.

Advanced tip. Enlarging A4 to A3 for print? Use Fit (not Stretch) so text and graphics scale proportionally and stay sharp; Stretch warps the layout.

Common mistake to avoid. If you wanted a smaller file, resizing won't do it — that's Compress PDF. Resizing changes the page dimensions, not the byte size.

Recommendation. Mixed page sizes that each need different handling? Select and resize them in groups, or split first with Split PDF.

Support

Frequently Asked Questions

How do I resize a PDF or change its page size?

Upload the PDF, pick a Target Page Size (like A4 or A3), choose how the content should fit, and click Apply & Download PDF. The live preview shows the result first. You can resize the whole document or just selected pages. It all runs in your browser, with no upload.

Which page sizes can I choose?

Six: A4, US Letter, Legal, A3, A5, and Square, each in Portrait or Landscape. A4 and Letter are the everyday document sizes, A3 is good for enlarging to a poster, A5 for booklets, and Square for social or display use.

What do Fit, Shrink, Stretch, and Center do?

Fit scales the content proportionally to fit the new page with no distortion (it may leave even margins). Shrink does the same but won't enlarge a smaller page, avoiding blur. Stretch fills the whole page edge to edge, which can distort. Center keeps the content at its original size in the middle of the new page.

Does resizing reduce the file size?

No — that's a common mix-up. Resizing changes the page dimensions (for example A4 to A3), not the file's byte size. If your goal is a smaller file for email or upload, use Compress PDF instead; the two tools do different jobs.

Can I resize only some pages?

Yes. Click the pages you want in the thumbnail strip to target just those, or use Select All to resize the whole document. This is useful when a single oversized chart or appendix needs a different size from the rest of the file, which is merged back in order on download.

What do the margin slider and background colour do?

The margin slider adds even padding around your content on the new page, for breathing room or print safety. The background colour fills any empty space created when the old and new page proportions differ (for example, fitting a wide page onto a tall one), so the result looks intentional rather than leaving stark white bands.

Does resizing reduce quality?

No, with one caveat. Scaling is vector-based through the PDF engine, so text and shapes stay sharp when you enlarge or reduce. Only Stretch intentionally distorts the content, and enlarging a low-resolution scanned page can look soft because there aren't enough pixels — use Fit for the cleanest result.

Are my files uploaded — is it safe?

No. The resizing happens entirely in your browser, so the PDF never leaves your device or reaches a server. That matters for contracts, financials, and personal documents. Closing the tab clears the file from memory.

Can I resize a PDF on my phone's browser?

Yes. The tool works in any modern browser on iPhone or Android — no app needed. Upload, choose a size and fit mode, and download. Large documents render the preview and thumbnails faster on a laptop than on an older phone.

Is it free, with no watermark or signup?

Yes. Resizing is free, the result has no watermark, and there's no account to create. Choose your size and fit, and download a clean file — no paywall before the download.

How do I convert A4 to A3, or Letter to A4?

Upload the file, select the target size (for example A3 or A4), keep Fit as the content behavior so everything scales proportionally, and Apply & Download. Going A4 to A3 scales the content up to the larger sheet; Letter to A4 adjusts for the slightly different proportions with small margins.

Does it change my original PDF?

No. The tool creates a new resized file for you to download; your original stays exactly as it was on your device. Keep the original until you've confirmed the new size and fit look right.

Still have questions?

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