PNG Compressor

PNG is a lossless image format — every pixel is preserved exactly, including transparency. That's what makes it perfect for screenshots, app icons, UI mockups, and graphics with text or sharp edges. The trade-off is file size: a high-resolution PNG can be five to ten times larger than the equivalent JPG. iFormat's PNG compressor shrinks PNG files without changing how they look, using palette optimization and modern lossless techniques.

When you should compress PNG

• Web images — page weight is a ranking signal and a user-experience factor. A 500 KB hero PNG dragged down to 120 KB makes a measurable difference in Core Web Vitals.
• App and game assets — installed app size matters on mobile. Compressed PNGs reduce download size and update size.
• Screenshots for docs or support — a 2 MB UI screenshot is overkill for a help article. Compressing to 200-400 KB keeps clarity and cuts bandwidth.
• Email attachments — many SMTP servers reject attachments above 25 MB total. Compressing screenshots and graphics helps.
• Cloud storage and Git LFS — every megabyte of stored PNG translates to faster syncing, smaller backups, and lower storage bills.

Lossless vs lossy PNG compression

Lossless compression reduces file size by finding patterns in the data and storing them more efficiently — the result is byte-different but pixel-identical to the source. Typical savings: 20-50%.

Lossy compression (sometimes called "PNG quantization") goes further by reducing the number of unique colors in the image — often from millions to a few hundred. The visual difference is usually invisible on photos and UI screenshots, but savings can hit 70-85%.

iFormat picks the best strategy automatically based on the source. Photographs and gradient-heavy images use lossy quantization for maximum savings; sharp-edged graphics and icons stay lossless.

When to keep PNG vs convert to another format

• Keep PNG when you need transparency, sharp text, UI mockups, icons, or pixel-perfect graphics.
• Convert to JPG for photos with no transparency — JPG is built for photographs and produces dramatically smaller files. Use the broader Image Converter to switch formats.
• Convert to WebP for the best modern web compromise — 25-35% smaller than PNG with transparency support and wide browser compatibility.
• Convert to SVG when the source is line art, logos, or icons that scale.

File size expectations

• Phone screenshot, 1080×2400 — typical PNG around 1.5-3 MB; compressed lossless ~700 KB-1.5 MB; lossy quantized ~200-400 KB.
• 4K screenshot, 3840×2160 — typical PNG 4-8 MB; compressed lossless 2-4 MB; lossy 600 KB-1.2 MB.
• App icon, 512×512 — typical PNG 100-200 KB; compressed 40-80 KB.
• Web hero PNG with transparency — typical 800 KB-1.5 MB; compressed 200-400 KB.

Related image tasks

• Need a hub for all image tools? See the Image Compressor (JPG, PNG, WebP).
• Compressing JPG specifically? Use the JPG Compressor for photo-targeted optimization.
• Switching formats? Image Converter handles PNG ↔ JPG ↔ WebP ↔ HEIC.
• Need a transparent background instead of a flat one? Try the Background Remover.

How to compress PNG

1. Upload one or more PNG files (drag-and-drop or click to browse).
2. Pick a target: maximum quality (lossless), balanced (recommended), or maximum compression (lossy quantization).
3. Click Compress. Most files finish in seconds.
4. Download individually or as a ZIP. Originals are not modified.

All uploads are encrypted, processing is isolated per request, and your files are automatically deleted after compression completes — typically within minutes, always within 24 hours.