How to Reduce Size of PNG File Online – Free Tool

Whether you're a web developer dealing with slow-loading pages, a blogger prepping images for upload, or a designer sending files to a client, the need to reduce size of PNG files is a daily reality. PNG's lossless format keeps quality high but creates files that are often 3–10× larger than they need to be for web use.

The fastest way to reduce size of PNG

The single most effective action is to resize the image to its display dimensions and convert to WebP. A 3000 × 2000 px PNG photo served in an 800 × 600 px container is wasting 87% of its data. Reducing dimensions alone can cut the file to one-tenth of its original size.

Methods to reduce PNG size

• Resize dimensions: Most effective. Reducing 3000px to 800px creates 75–85% size reduction.
• Convert to WebP: Achieves 25–35% reduction at same dimensions with comparable quality.
• Convert to JPG: For photographs without transparency, 60–80% reduction at high quality settings.
• Lossless PNG compression: Re-encoding with better algorithms achieves 5–20% reduction.

Step-by-step with Resizo

• Open Resizo and drop your PNG file.
• Set the target display dimensions.
• Choose WebP or JPG as output format.
• Download the reduced file.

When you must keep PNG format

If the file must remain PNG (for transparency or specific system requirements), focus on resizing to the minimum necessary dimensions. A logo that displays at 200px wide doesn't need to be 2000px wide in the file — that's 100× more data than necessary.