Is 11x17 the Same as A3?

No. 11x17 inches (tabloid) and A3 are not the same size. 11x17 measures 279.4 × 431.8 mm. A3 measures 297 × 420 mm (11.69 × 16.54 in). They have different aspect ratios, which is why a file designed for one won't print cleanly on the other without cropping or letterboxing.

If you're just trying to confirm before sending a file to print, that's your answer. If you want to understand why the difference matters — and how to set up your file correctly for whichever size you actually need — read on.

The Exact Measurements

Here's the side-by-side breakdown:

The two formats are within about 1% of each other in total area, which is why they feel interchangeable. But A3 is wider and shorter, while 11x17 is narrower and taller. That's the gotcha.

Why People Confuse Them

Both sizes occupy the same visual category — bigger than letter, smaller than 18x24 — and both are commonly used for posters, flyers, menus, and gig posters. The two sizes are often grouped in poster size guides, and we've seen well-ranking print blogs incorrectly state that 11x17 is "also known as A3." It isn't. The two formats come from completely different sizing systems:

• 11x17 (tabloid) is part of the North American paper system, where each size is exactly double the previous one. Tabloid is 2× letter (8.5 × 11), and ledger is 2× tabloid.
• A3 is part of the ISO 216 international system used in Europe, Asia, and most of the world. Each A-size has a √2 aspect ratio, which is the only ratio that stays consistent when you fold the sheet in half.

That √2 ratio is also why an A4 file scales perfectly to A3, A3 to A2, and so on — but an 8.5x11 letter file does not scale perfectly to 11x17, even though the dimensions double. The aspect ratio shifts. Worth knowing if you're enlarging a design.

Why the Difference Matters for Your Print File

If you're designing for print, the 1% area similarity is a trap. Here's what actually goes wrong when the sizes get mixed up:

Cropping and Letterboxing

Send an A3 file to a printer set up for 11x17, and one of two things happens: either the printer scales the file to fit (leaving white bars on the top and bottom, since A3 is shorter relative to its width), or it scales to fill and crops the sides. Neither is what you want.

Bleed Setup

Full-bleed designs — where color or imagery runs all the way to the edge of the page — need an extra 0.125" (3 mm) of artwork beyond the trim line on every side. Those bleed dimensions are different for 11x17 versus A3:

• 11x17 with bleed: 11.25 × 17.25 in (286 × 438 mm)
• A3 with bleed: 303 × 426 mm (11.93 × 16.77 in)

If you set up your file for one size and submit to a printer expecting the other, your bleed won't align, and you'll see white edges after trimming.

Frame Compatibility

Standard 11x17 frames sold in the US won't fit an A3 print, and vice versa. The difference is small enough that the print might slide in if forced, but you'll get visible gaps or overhang. If you're selling art prints to an international audience, this is a real customer service issue worth addressing up front.

How to Tell Which One You Actually Need

The decision is usually simpler than people make it:

• Printing in the US? Default to 11x17. Your printer, your paper stock, your ready-made frames, and your local print shops are all built around tabloid.
• Printing in Europe, Asia, Australia, or most of the rest of the world? Default to A3. The ISO system is standard everywhere outside North America.
• Designing for an international audience? Pick one based on where most of your prints will end up, and stick with it. Don't try to convert mid-project — you'll introduce alignment errors.

Setting Up Your File Correctly

Canva

Canva has A3 as a preset - but not 11x17 - you'll need a custom size for tabloid. Click "Create a design" → "Custom size" → enter 11 × 17 inches. For A3, search "A3" in the templates dropdown, and it'll pull up a 297 × 420 mm canvas automatically.

Adobe InDesign, Illustrator, and Photoshop

In any Adobe app, set up your document with these specs:

• Dimensions: 11 × 17 in or 297 × 420 mm (A3)
• Resolution: 300 DPI
• Color mode: CMYK for print (RGB will shift on press)
• Bleed: 0.125 in / 3 mm on all sides
• Safe zone: keep important text and logos at least 0.25 in / 6 mm inside the trim line

Need help calculating the exact dimensions for your file? Our Print Size Calculator handles the bleed math for any standard or custom size.

Quick FAQ

Is A3 bigger than 11x17?

A3 is wider than 11x17, but 11x17 is taller. Their total areas are within about 1% of each other, so neither is meaningfully "bigger" — they're just shaped differently.

Can I print an A3 file on 11x17 paper?

Yes, but you'll get either cropped edges or white letterboxing along the top and bottom because the aspect ratios don't match. For best results, rebuild the file at the correct size.

What's the US equivalent of A3?

There isn't an exact equivalent. 11x17 (tabloid) is the closest standard US size and is what most American print shops will recommend when someone asks for "A3-sized printing."

Are A3 and tabloid the same?

No. Tabloid is the North American name for 11x17 inches. A3 is the international ISO 216 size at 297 × 420 mm. They're similar in feel but measurably different.

Why does the difference matter?

Different aspect ratios mean a file designed for one size won't print cleanly on the other. You'll get cropping, scaling, or letterboxing — and if you're printing with bleed, the trim won't align correctly.

Need 11x17 prints? Printkeg specializes in high-quality tabloid posters, flyers, and art prints on premium paper stocks. Browse our poster collection or flyers to get started.