Poster Size in Pixels: A Complete Size Chart

1. Choosing physical width, height, and resolution

When creating a new document (File > New), set the measurement units to Inches (or Millimetres for ISO A-series). Enter the exact physical dimensions required by your frame or print lab. In the Resolution field, enter your target PPI: enter 300 Pixels/Inch for high-detail art or small posters, and 150 to 200 Pixels/Inch for large-format displays (18×24" and above), subject to your printer's specifications.

2. Resampling vs. changing resolution metadata

In Image > Image Size, the Resample checkbox fundamentally alters how Photoshop handles pixels:

• Resample unchecked: Locks total pixel dimensions. Changing the resolution field simply recalculates physical document print inches without adding or removing image data.
• Resample checked: Photoshop generates new pixels or discards existing ones using interpolation algorithms (such as Bicubic Smoother or Preserve Details 2.0).

Note on image upscaling: Resampling generates mathematically estimated pixel values. While modern interpolation algorithms may enhance perceived edge appearance or prevent blocky pixelation, they cannot reliably reconstruct original fine detail that was absent in the source file.

3. Preserving aspect ratio when scaling

Ensure the proportional link (chain icon) between Width and Height remains locked. Scaling an image with unlocked dimensions alters its aspect ratio, resulting in unnatural stretching or squashing. If your photo's proportions do not match your poster's shape, crop the image intentionally rather than distorting it. Check pixel conversions with our DPI / PPI Calculator.

4. Adding bleed according to printer specifications

When artwork extends to the physical paper edge, commercial printers typically require extra image area called bleed so trimming variations do not leave unprinted white slivers. Bleed amounts vary by provider and product type; 0.125 inches (1/8 in) per edge is a common example, but your provider's guidelines and downloadable templates always take precedence.

If your print shop specifies 0.125 inches per edge, adding 0.125 inches to all four sides increases the total canvas width by 0.25 inches (0.125" left + 0.125" right) and height by 0.25 inches (0.125" top + 0.125" bottom). In Photoshop, use Image > Canvas Size to add 0.25 inches to both dimensions. For an 18×24 poster with 0.125-inch bleed, the pre-trim canvas becomes 18.25 × 24.25 inches (5475 × 7275 pixels at 300 PPI). Printers also typically recommend keeping essential text and logos within a designated "safe zone" (often 0.125 to 0.25 inches inside the trim line, depending on provider instructions).

5. Exporting print-ready files

Export your finished poster using a format specified by your print provider:

• PDF (PDF/X-1a or PDF/X-4): Widely used in commercial production. Preserves vector text and graphics with embedded color profiles.
• TIFF: Lossless uncompressed or LZW-compressed format often requested by fine art and photo print services.
• High-quality JPEG: Saved at Maximum Quality with color profile embedded, where acceptable to the print shop.

What is poster size in pixels?

Poster size in pixels is the total pixel count required to print a physical poster at a given resolution. It is calculated by multiplying physical dimensions in inches by target PPI (pixels per inch). For example, an 18×24-inch poster at 300 PPI requires 5400 × 7200 pixels.

What is a good poster size in pixels?

A good pixel dimension depends on the intended print size, viewing distance, and source image quality. For an 18×24-inch wall print, 5400 × 7200 pixels (300 PPI) provides high resolution for close viewing, while 2700 × 3600 pixels (150 PPI) is often practical when viewed from a few feet away.

What is the standard poster size in pixels?

There is no single universal standard because posters come in many physical formats. Common choices in North America include small posters (11×17 in: 3300 × 5100 px at 300 PPI), medium prints (18×24 in: 5400 × 7200 px at 300 PPI), and large posters (24×36 in: 7200 × 10800 px at 300 PPI), while international markets often use ISO sizes such as A2 and A3.

How many pixels do I need for an 18×24 poster?

For an 18×24-inch poster in portrait orientation, you need 5400 × 7200 pixels at 300 PPI for high resolution, or 2700 × 3600 pixels at 150 PPI for standard viewing distances. In landscape orientation, the dimensions swap to 7200 × 5400 pixels.

Is 150 PPI enough for a poster?

In many cases, yes. Posters viewed from several feet away generally require lower pixel density than handheld prints. However, whether 150 PPI is sufficient depends on the source image quality, viewing distance, print method, and print provider requirements. Fine-art prints viewed up close benefit from higher resolution.

What resolution should I use for a large poster?

A target between 150 and 200 PPI is often practical for prints 24×36 inches and larger when viewed from a few paces back. For critical fine-art reproduction or close scrutiny, aim higher if the source file permits, and always consult your printer's recommended specifications.

Can I increase the pixel size of a poster in Photoshop?

Yes, through the Image Size dialog with Resample checked. However, resampling generates estimated pixel values through interpolation. While modern algorithms may improve perceived edge contrast or smoothness, they cannot reliably reconstruct original fine detail that was absent in the source file.

Are digital poster sizes the same as print poster sizes?

No. Digital posters are prepared directly in screen pixels (such as 1080 × 1350 px for Instagram or 1920 × 1080 px for displays) and ignore physical print PPI. Print posters require physical dimensions multiplied by print resolution to produce substantially larger pixel counts.