Is A3 bigger than A4?

Yes. An A3 sheet is exactly twice the size of an A4 sheet.

Can I print a PDF designed for A4 on A3 paper?

Yes, you can scale it up in your print settings, but the print will look slightly blurry unless the original design has a high resolution (at least 300 DPI).

How does ResizeFlow automate this process?

Upload your master design. ResizeFlow automatically generates both A3 and A4 versions at 300 DPI in a single ZIP package.

A3 vs A4 Paper Sizes Compared: Dimensions Chart

Quick Answer

An A3 paper size (297 x 420 mm) is exactly twice the size of an A4 sheet (210 x 297 mm). In printable wall art and document design, A3 and A4 share the same ISO aspect ratio of 1:1.414. This means a design file set to an A4 ratio can be printed at A3 without stretching, provided the resolution is high enough. ResizeFlow automates this, upscaling designs to 300 DPI print-ready quality.

Comparing A3 and A4 Specifications

A3 and A4 are the two most common international paper sizes. Because they share the same proportions, you can scale layouts between them:

A4 Dimensions: 210 x 297 mm or 8.27 x 11.69 inches
A3 Dimensions: 297 x 420 mm or 11.69 x 16.54 inches

To ensure your shop covers all common aspect ratios, review our list of sizes in the 2:3 printable size guide.

Pixel Resolutions for Crisp Prints

To print A3 designs without pixelation, ensure your file contains enough pixels. An A4 image (2480x3508 pixels) can be printed at A3, but upscaling the file to A3 dimensions (3508x4960 pixels) at 300 DPI yields much sharper results.

Formatting A3 and A4 Files with ResizeFlow

ResizeFlow takes the manual calculations out of file preparation. Upload your designs and select the target aspect ratios.

Use Scale to Fit (Preserve Entire Artwork) to keep your layouts intact, or Smart Center Crop to frame illustration details. ResizeFlow upscales each file to 300 DPI and compiles them in structured ZIP folders.

A3 vs A4 Paper Sizes Compared