Compress PNG Files Online for Free

Free

Reduce PNG file size without touching pixel quality. Preserves transparency. Runs in your browser — no upload, no signup.

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What's next

Convert to WebP
Even smaller files with transparency preserved
Resize first
Resize before compressing for the largest total reduction
Open in editor
Edit your image before optimising

Settings guide

PNG compression options:

  • ·Lossless compression: Reduces file size 10–30% by improving how the file encodes the same pixels. Zero quality change. This is always safe to apply.
  • ·Palette reduction (PNG-8): Limits the image to 256 colours. Reduces by 40–70% for simple graphics and icons. Not suitable for photos — introduces visible banding.
  • ·When PNG is still too large: Convert to WebP for an additional 26% reduction while preserving transparency. WebP lossless achieves better compression than PNG with identical quality.

Use PNG compression when: you need transparency, the image has sharp text or fine edges, or you plan to edit the file again. Consider WebP instead when: the image is for web delivery and maximum file size efficiency matters.

Format comparison

PNG vs JPEG: PNG is 3–10× larger than JPEG for photographs. Use PNG when transparency is required, or when the image has sharp text and logos that JPEG would blur.

PNG vs WebP: WebP lossless is typically 26% smaller than PNG with identical quality and full transparency support. For web-only use cases, WebP is the better choice. PNG remains essential for maximum software compatibility.

PNG vs SVG: If your image is a logo, icon, or other vector graphic, SVG is better than PNG — it scales to any size without quality loss and is often smaller. Use PNG when the image is raster and SVG is not available.

How it works

1

Upload

Drop your PNG file into the compressor.

2

Compress

Lossless compression runs automatically, preserving every pixel.

3

Download

Save your compressed PNG — identical quality, smaller file.

About this format

PNG compression is fundamentally different from JPEG. It is lossless — it reduces file size by removing redundant data and optimising how the file is encoded, without discarding any pixel values. Your image looks identical before and after. This is not a trade-off between quality and size; it is pure efficiency gain.

This compressor targets PNG specifically: what you can and cannot reduce, when lossless compression hits its limit, and what your options are when a PNG is still too large after compression. For screenshots with text, transparent logos, and UI graphics, PNG is the right format. For photos without transparency, JPEG or WebP will be far smaller.

Drop your PNG file, compress, and download. Everything runs in your browser — your files are never uploaded anywhere.

Frequently asked questions

Does compressing a PNG reduce image quality?+
No. PNG uses lossless compression — it removes redundant data without changing any pixel values. Your image looks pixel-identical before and after. This is fundamentally different from JPEG, which permanently discards data.
Does PNG compression preserve transparency?+
Yes. PNG compression never touches the alpha channel. Transparent areas, semi-transparent gradients, and drop shadows are preserved exactly after compression.
Why is my PNG file larger than the same image as JPEG?+
JPEG uses lossy compression that achieves much higher ratios by discarding colour data. PNG preserves every pixel exactly. For photographs, PNG is typically 3–10× larger than JPEG. PNG is worth the size when you need transparency or plan to edit the image again.
What is the difference between PNG-8 and PNG-24?+
PNG-8 supports 256 colours — ideal for simple graphics and icons with flat colours. PNG-24 supports millions of colours and is needed for photographs and complex gradients. For icons and logos with flat colours, PNG-8 can be 40–70% smaller with identical appearance.
When should I keep PNG instead of converting to JPEG or WebP?+
Use PNG for: transparent backgrounds, screenshots with text, logos and icons, and images you'll edit again. Convert to WebP if file size is critical and you need transparency. Convert to JPEG for photos where transparency isn't needed.
My PNG logo looks blurry on retina screens — is that a compression issue?+
No. Retina screens have 2× the pixel density. A 100×100px PNG appears as 50×50px on retina. Create logos at 2× the target display size (200×200px for a 100px logo). Compression does not affect pixel density.
Are my PNG files uploaded to a server?+
No. Compression runs in your browser via Web Workers. Your files never leave your device.

Related tools and guides

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