Integer Scaling and Aspect Ratio Explained

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You load up an old game on your handheld and something looks off. The pixels are a little fuzzy, or characters look slightly stretched, and you cannot quite say why. The answer is almost always one of two settings: integer scaling and aspect ratio. Understanding them takes five minutes and makes your games look the way they were meant to. This guide explains both in plain English and shows you what to change.

Affiliate disclosure: This guide contains affiliate links. As an Amazon Associate and Anbernic affiliate, we earn from qualifying purchases at no extra cost to you.

The Core Problem

Old games were made for old screens with low resolutions. Your handheld has a modern screen with a different, higher resolution. To fill that screen, the emulator has to stretch the original image. How it stretches is where things go right or wrong. Do it carelessly and pixels get smeared or squished. Do it correctly and the game looks crisp and authentic.

Aspect Ratio: The Shape of the Image

Aspect ratio is the shape of the picture, the relationship between width and height.

Most retro consoles output a roughly 4:3 image, a nearly square shape.
Modern handheld screens are often 16:9 widescreen, or sometimes square like 1:1.
If you stretch a 4:3 game to fill a 16:9 screen, everything gets too wide. Circles become ovals and characters look chubby.

The fix is to set the aspect ratio correctly so the game keeps its original proportions.

Use a 4:3 or original aspect setting for most retro systems. This keeps shapes correct, with black bars on the sides of a widescreen handheld. Those bars are normal and correct.
Some systems, like the GBA, used a wider screen and look right filling more of the display.
Avoid the stretch or full setting unless you genuinely prefer a filled screen over correct proportions.

Correct proportions beat a full screen almost every time. A little black bar is a fair trade for a game that looks right.

Integer Scaling: Keeping Pixels Crisp

Integer scaling is about keeping the pixels clean when the image is enlarged.

When you scale an image by a whole number, like exactly 2 times or 3 times bigger, every original pixel becomes a perfect block of pixels. Everything stays sharp and even. When you scale by an odd fraction, like 2.7 times, some pixels get doubled and others do not, which makes the image look uneven and slightly fuzzy. That unevenness is what people see as blurriness on retro games.

Integer scaling on forces whole-number scaling, so pixels stay perfectly even and crisp.
The trade-off is the image may not fill the entire screen, since a whole-number scale rarely matches the screen exactly. You get a slightly smaller, perfectly sharp image with a thin border.
Integer scaling off fills more of the screen but allows uneven pixels and a softer look.

For pixel-art purists, integer scaling on looks noticeably cleaner. Try it both ways and see which you prefer.

How They Work Together

Aspect ratio fixes the shape. Integer scaling fixes the sharpness. Used together you get a game with correct proportions and crisp, even pixels. The result fills most of the screen, keeps a thin border, and looks exactly like the original game on a good display.

Where to Find These Settings

In RetroArch, both live in the video settings.

Open Settings, then Video, then Scaling.
Set Aspect Ratio to Core Provided, 4:3, or 1:1 PAR depending on the system and your taste.
Turn on Integer Scale to keep pixels crisp.
Load a game and compare. Adjust to taste.

Standalone emulators on Android have similar options under their display or video settings.

What About Shaders?

Scaling decides the shape and sharpness of the image. Shaders are a separate layer that can add effects like a CRT glow or an LCD grid on top. They work together: get your scaling right first, then add a shader if you want that authentic old-screen look. Our RetroArch shaders guide covers that next step.

The Bottom Line

If your retro games look fuzzy or stretched, fix two things. Set the aspect ratio so shapes are correct, and turn on integer scaling so pixels stay crisp. Five minutes of setup makes every game on your handheld look the way it was meant to.