Does this use AI upscaling?

No. It uses nearest-neighbor resampling, a fast, dependency-free scaling method. It won't invent new detail the way an AI super-resolution model might; it enlarges existing pixels.

What upscale percentages are supported?

101 to 800 percent. For example, 200% doubles both width and height; 400% quadruples them, clamped to this category's 4096px maximum dimension.

Will upscaling make my image look blurry?

No, nearest-neighbor scaling keeps hard edges crisp rather than blurring them, though large blocks of near-identical pixels can look visibly 'blocky' at high upscale factors.

What's the difference between this and the general PNG resizer?

The resizer lets you set exact target pixel dimensions; this tool works from a percentage of the original size instead, which is more convenient when you just want '3x bigger' rather than a specific pixel count.

PNG Upscaler - Enlarge an Image Online

Overview

Introduction

This tool enlarges a PNG by a percentage of its original size, entirely in your browser.

It reuses the same nearest-neighbor resizing logic as this category's general resize tool, just driven by a percentage instead of exact target dimensions.

What Is PNG Upscaler?

A percentage-based upscaling tool: you choose how much bigger you want the image (101% to 800%), and it computes the corresponding target width and height and resizes to it.

Internally it's a thin wrapper around the shared `resizePng`/`resizeNearest` functions used across this category.

How PNG Upscaler Works

The target width and height are computed as the original dimensions multiplied by the scale percentage, then clamped to this category's 4096px maximum.

Each output pixel is filled by sampling the nearest source pixel, which is fast and keeps hard edges crisp but doesn't smooth or interpolate between pixels.

When To Use PNG Upscaler

Use it when you need a larger version of a small image, like enlarging an icon or thumbnail for closer inspection or a bigger display.

It's best suited to graphics with hard edges (icons, pixel art, logos) rather than photographs, where interpolated upscaling would look smoother.

Often used alongside PNG Downscaler, PNG Resizer and PNG Zoomer.

Features

Advantages

Runs entirely client-side; nothing you upload leaves your device.
Simple percentage input instead of having to calculate exact target pixel dimensions.
Reuses this category's proven, tested resize logic rather than a separate implementation.

Limitations

Nearest-neighbor upscaling doesn't add real detail; it just repeats existing pixels, so results can look blocky at high scale factors.
Target dimensions are clamped to 4096px, so extremely large source images can't be scaled as far.

Examples

Double an icon's size

Input

A 64x64 PNG icon, 200%

Output

A 128x128 PNG, blocky but crisp-edged

Doubling with nearest-neighbor sampling keeps flat-color icon edges sharp.

Enlarge a small photo

Input

A 200x150 PNG, 300%

Output

A 600x450 PNG with visibly blocky detail

Photos with gradients show more visible blockiness under nearest-neighbor upscaling than flat-color graphics do.

Best Practices & Notes

Best Practices

Use this for icons and flat-color graphics rather than photos for the cleanest-looking result.
If you need smoother enlargement of a photo, expect some blockiness since no interpolation is applied.

Developer Notes

The lib function computes clamped target dimensions from the percentage and delegates entirely to resizePng, so all the actual resampling logic stays in one tested place shared across the resizer, zoomer, and downscaler tools.

PNG Upscaler Use Cases

Enlarging a small logo for a print mockup
Making a thumbnail bigger for a closer look
Scaling up pixel art while keeping hard edges

Common Mistakes

Expecting AI-quality detail enhancement — nearest-neighbor upscaling only repeats existing pixels.
Upscaling a photo by a large factor and being surprised by visible blockiness.

Tips

Combine with the sharpener tool after upscaling a photo to add back some perceived crispness.
Stick to smaller scale percentages (150-250%) for the least blocky-looking results on photographic content.

PNG Upscaler