A4 to A3 Complete Guide -Convert/Resize/Scale

Do you only have A4 documents, but your printer only prints A3 paper? Or you need to enlarge an A4 document to A3 size for presentation or review?

Converting from A4 to A3 is not simply a matter of enlarging the document (doubling the area); it also involves issues such as whether to stretch the content, whether to preserve the original proportions.

So this article will introduce everything from basic print settings to professional PDF editing software (UPDF), and finally, your issues will be easily solved.

Part 1. Basic Tips for A4 and A3

• A4：210mm × 297mm
• A3：297mm × 420mm
• Area relationship: One A3 sheet is exactly equal to two A4 sheets placed side by side (with the long sides of the A4 sheets aligned)

Scaling from A4 to A3 linearly results in a scaling factor of approximately 141% (because √2 ≈ 1.414).

Note: If printed at 100%, A4 content will only occupy a small portion of the A3 paper, leaving large blank spaces around the edges.

Part 2. 3 Easy Paths for Converting A4 to A3  

If you have a single A4 PDF file of a complex visual or dataset, then you can convert A4 PDF to A3 using different tools. Let's see how to convert A4 to A3 according to your needs.

Method 1: Achieving "Enlarged Printing" via Print Settings (Simplest, No Change to the Original File)

Suitable Scenarios: Temporary printing needs, no need to permanently modify the PDF file.

Steps:

1: Open the PDF, File > Print (Ctrl+P) --- Select printer (physical printer or Adobe PDF virtual printer) --- Paper Size Selection: A3.

2: Page Scaling Selection: "Fit to Printable Area" or "Scale to Paper Size": Automatically enlarges A4 content to fill A3 paper.

3: "Custom Scaling": Manually enter 141% for precise enlargement.

4: Click Print.

Advantages and Disadvantages:

Advantages: Fast, simple, no change to the original file.

Disadvantages: Dependent on print driver; results may vary slightly depending on the printer; if using virtual printing, a new file will be generated.

Method 2: Permanently Enlarge Pages Using UPDF (Preserving the Original File Structure)

Applicable scenario: When you need to generate a permanent new A3-sized PDF file and want the content to fill the entire page.

UPDF is a powerful PDF editor and converter tool that can take your A4 and convert it into A3 paper dimensions: 11.7 x 16.5 inches. All it requires is a few simple clicks to print A4 to A3 while preserving all details. On top of that, UPDF allows you to crop, rotate, and resize individual PDF pages to further enhance the document quality the way you want.

The key features of UPDF are as follows:

• Convert/resize/scale A4 to A3 PDF with simple clicks.
• Crop, resize, and rotate individual PDF pages.
• Shrink oversized pages with one click.
• Customizable printer settings, such as print in grayscale, custom page printing, paper orientation, and much more.
• Convert A4 to other formats as well, including A5, B4, B5, tabloid, letter, etc.
• Batch resize multiple PDFs from A4 to A3.
• One-click detection of inconsistent page sizes in PDF files and one-click repair.

Let's now see UPDF in action and list the steps to resize A4 to A3 PDF with it.

Step 1. Download and launch UPDF on your Windows/Mac computer. Click "Open File" from the home screen and select the A4 PDF.

Step 2. Click the narrow next to Save > Print to open the printer settings.

Step 3. Under the "Paper Size" section, select "A3".

Step 4. Customize other printer settings the way you want, such as orientation, grayscale print, shrink the oversized page, etc. Once done, select "Microsoft Print to PDF" and then click the "Print" button.

Step 5. To crop or resize selective pages further, click the "Crop" icon in "Tools" from the left sidebar and go to the page you want to resize. Then resize/crop the page the way you want.

That's it! This way, UPDF offers an intuitive approach to convert A4 PDF to A3 effortlessly. Besides resizing a single A4 PDF, you can do the same for multiple PDFs at once with UPDF. The next part talks in detail about it.

Method 3: Convert Two or More A4 Pages into A3

Applicable Scenarios: Sometimes, there is a need to resize multiple A4 PDFs to A3. For instance, you may have several A4-sized drawings of a project that you now want to print in A3 for effective presentation. Here again, UPDF comes into action.

UPDF has a dedicated "Batch Process" feature with which you can resize and print multiple A4 PDFs to A3 at once. All you have to do is select all the A4 PDFs and then set the paper size as A3. The batch process feature even allows you to select the entire folder instead of selecting files one by one.

Here are the steps to batch print multiple PDFs (A4 to A3) with UPDF:

Step 1. Launch UPDF and click "Tools" from the main home screen.

Step 2. From the list of batch process activities you can do, select the "Print" option.

Step 3. Click "Add File" and select the PDFs you want to convert from A4 to A3.

Step 4. Select "A3" in "Page Size". Then click "Print" to print the PDFs.

This way, you can easily print multiple A4 PDFs to A3. Simply put, UPDF is your best companion to convert/resize/scale A4 to A3 for single or multiple PDFs. Therefore, download UPDF and get the A3 formatted documents conveniently.

Conclusion

The need to convert A4 to A3 is common whenever the A4 paper fails to demonstrate a detailed picture or lengthy datasets. By resizing A4 PDF to A3, you can effectively increase the size of the pictures, objects (arrows, stripes, squares), and other elements.

For that, UPDF is your ultimate solution to effortlessly converting, scaling, and resizing A4 to A3 PDF documents. Therefore, follow the steps discussed in this guide and leverage UPDF to print A4 to A3 conveniently.