How is this different from the PNG Compressor tool?

The compressor keeps the same dimensions and reduces color complexity instead. This tool reduces the actual pixel dimensions, which usually has a much bigger effect on file size since fewer pixels means fewer bytes to encode, period.

Will the image look blurry after reducing it?

It will look smaller and, if later displayed at its original size, softer, since resampling always loses some detail. At its new native size, though, it looks like a normal sharp (if smaller) image.

What scale percentage should I use?

It depends on how the image will be used. For a thumbnail, 25-50% is common. For a modest size saving with minimal visible quality loss, try 80-90% first.

Can I combine this with the PNG Compressor?

Yes. Reducing resolution first and then running the result through the color-quantizing compressor stacks both size-saving techniques.

PNG File Size Reducer - Shrink an Image by Resolution

Overview

Introduction

This tool shrinks a PNG's download size by reducing its resolution, entirely in your browser.

Because file size scales roughly with pixel count, cutting the dimensions is often the fastest way to make a PNG dramatically smaller.

What Is PNG File Size Reducer?

A client-side resolution downscaler that reads an uploaded PNG's pixel data and resamples it to a smaller width and height using nearest-neighbor interpolation, the same fast algorithm the site's other resize tools use.

Unlike a general-purpose resizer, this tool frames the control as a single 'how much smaller' percentage aimed specifically at reducing file weight.

How PNG File Size Reducer Works

You choose a scale percentage from 1 to 100; the tool multiplies the original width and height by that percentage (rounding to whole pixels, with a floor of 1px) and resamples every output pixel from its nearest source pixel.

The tool also reports the percentage reduction in total pixel count, since that's a good proxy for how much smaller the resulting file will be.

When To Use PNG File Size Reducer

Use it whenever a PNG's dimensions are larger than needed for where it will actually be displayed, such as a hero image sized for print resolution but shown at web resolution.

It's the right first step when a PNG's file size is the problem and its pixel dimensions have obvious headroom to shrink.

Often used alongside PNG Compressor and PNG Resizer.

Features

Advantages

Runs entirely client-side; the uploaded image is never sent to a server.
Usually the single most effective way to reduce a PNG's byte size.
Reports the percentage pixel-count reduction so you can gauge the impact before downloading.

Limitations

Downscaling is destructive: fine detail lost during resampling can't be recovered later by re-upscaling.
Nearest-neighbor resampling can look aliased on images with fine diagonal lines or text compared to a smoother (bicubic) algorithm.

Examples

Shrink a 2000x1500 hero image for the web

Input

A 2000x1500 PNG at 40% scale

Output

An 800x600 PNG with roughly 84% fewer total pixels

Scaling both dimensions by 40% reduces total pixel count (and therefore rough file weight) by 1 - 0.4^2 = 84%.

Create a small thumbnail

Input

A 1024x1024 PNG icon at 12.5% scale

Output

A 128x128 PNG

12.5% of 1024 is 128, producing a clean power-of-two thumbnail size.

Best Practices & Notes

Best Practices

Scale down only as much as the image's final display size requires; there's no benefit to a resolution far larger than where it will be shown.
Check the resulting dimensions in the preview before downloading, especially at very small scale percentages.

Developer Notes

The lib function reuses the shared resizeNearest helper (also used by png-resizer) rather than reimplementing resampling, and additionally reports the before/after pixel counts and percentage reduction, purely as an informational estimate of the file-size impact.

PNG File Size Reducer Use Cases

Shrinking an oversized PNG before using it as a web asset
Generating a smaller preview or thumbnail version of an image
Cutting bandwidth costs for image-heavy pages

Common Mistakes

Reducing resolution when the real problem is color complexity — try the PNG Compressor first if dimensions are already reasonable.
Scaling down so aggressively that the image becomes illegible at its intended display size.

Tips

Combine with the PNG Compressor for maximum file-size savings: downscale first, then quantize colors.
If you need an exact target width or height rather than a percentage, use the PNG Resizer instead.

PNG File Size Reducer