Paper Comparisons

16x20 vs 18x24 Poster Sizes Compared

Quick Answer

A 16x20 poster (4:5 aspect ratio) is wider and shorter proportionally than an 18x24 poster (3:4 aspect ratio). In printable wall art, these two sizes belong to different ratio families, meaning a single digital file cannot print both sizes without layout cropping or borders. ResizeFlow solves this by allowing you to export both sizes using Scale to Fit or Smart Center Crop to fit the target frame dimensions perfectly.

Comparing 16x20 and 18x24 Dimensions

The 16x20 and 18x24 are two of the most popular large-format poster sizes in North America, but they use different aspect ratios:

  • 16x20 inches (4:5 aspect ratio): 4800 x 6000 pixels at 300 DPI.
  • 18x24 inches (3:4 aspect ratio): 5400 x 7200 pixels at 300 DPI.

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

Cropping and Sizing Complications

If you try to print a 16x20 design on an 18x24 sheet, you will lose a portion of the top and bottom layout or end up with white borders on the sides.

To avoid these complications, digital sellers should offer both 4:5 (16x20) and 3:4 (18x24) files in their download packages.

Preparing 16x20 and 18x24 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.

Frequently Asked Questions

Generate All Print Dimensions Automatically

Don't waste time manually calculating pixels and cropping designs. Use ResizeFlow to automatically upscale and format your printable art bundles in seconds.

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