PNG Image Size Reducer – Free Online Tool

PNG files are large by design — they're lossless, storing every pixel without degradation. This makes them ideal for logos, icons, and screenshots, but impractical for web delivery of photographs. A PNG image size reducer addresses this by either resizing dimensions, converting format, or both.

Why PNG files are large

PNG uses lossless compression. It stores pixel data efficiently but without the aggressive compression that JPG and WebP use. For a photograph with thousands of colors and gradients, PNG can be 5–20× larger than JPG at equivalent visual quality.

By format comparison for a 1200 × 800 photo:

• PNG: 1.5–4 MB
• JPG quality 80: 120–300 KB (10–15× smaller)
• WebP: 80–200 KB (15–20× smaller)

Three ways to reduce PNG image size

Method 1 – Resize dimensions: Halving both dimensions reduces pixel count by 75% and file size proportionally. A 2400 × 1600 PNG reduced to 1200 × 800 will be approximately 4× smaller.

Method 2 – Convert to WebP: WebP supports transparency (like PNG) but uses lossy compression. WebP files are typically 25–50% smaller than equivalent PNG files for photographs and 20–35% smaller for graphics.

Method 3 – Convert to JPG: If transparency isn't needed, JPG is the most widely compatible smaller format. 5–15× smaller than PNG for photographs.

When to keep PNG (don't reduce size at all)

• The image is the source file — you'll edit it again later
• The image has transparency and must stay transparent
• The image contains line art, text, or screenshots that look worse in JPG (due to artifacts)
• The image is being used in print at exact dimensions

How to reduce PNG image size with Resizo

1. Open Resizo in your browser — completely free, no sign-up.
2. Drop your PNG file onto the tool.
3. If dimensions are too large, enter a smaller width.
4. Choose the output format:
• PNG: for images with transparency that must stay lossless
• WebP: for web delivery — smallest while supporting transparency
• JPG: for photos without transparency needing broad compatibility
5. Download the reduced image. Compare the size in your file manager.

PNG size reducer vs PNG compressor

A PNG size reducer typically refers to a tool that reduces overall file size (through any method). A PNG compressor specifically optimizes PNG encoding without changing format or dimensions. In practice, converting to WebP or JPG (a "format conversion") achieves far greater size reduction than PNG-only compression tools, which often only achieve 5–15% savings.