Compress PNG Images - Free PNG Optimizer Online
- • Free Premium Features
- • Quick Processing
- • Max Size 50 MB per image
Compress PNG images online for free — no software or signup needed. This PNG optimizer reduces file size while keeping transparency, sharp edges, and image quality intact, perfect for logos, icons, screenshots, and web graphics. Choose Optimize for the best automatic quality-to-size balance, or switch to Target Size to shrink your PNG under an exact KB limit.
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How to Compress PNG Images Online
Compressing images here is a simple 3 step process that anyone can follow:
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Upload Your Image
Click Select Images or drag and drop your JPG, PNG, or WebP file. You can upload multiple files at once. Maximum size is 50 MB per file.
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Choose Compression Mode
Use Optimize for automatic best quality-to-size balance. Switch to Target Size if you need to reduce image under a specific file size. E.g. 100 KB, 20 KB or 50 KB.
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Download Compressed File
Your image is compressed instantly. Click download button to save, scan the qr code to download the compressed image in mobile or share images by copying link.
How PNG Compression Works
PNG is a lossless format, meaning no pixel data is thrown away by default — which is also why PNG files are usually larger than JPEG. Our compressor shrinks the file size without a visible drop in quality, using a combination of techniques:
- Smarter re-encoding: The image is recompressed with more efficient settings than most cameras, design tools, or screenshot utilities use by default.
- Color and palette optimization: Images with fewer unique colors — icons, logos, screenshots — are converted to a smaller color palette with no visible quality loss.
- Metadata removal: Hidden data such as color profiles, timestamps, and editor metadata is stripped out, since it adds file size without changing how the image looks.
This is why two PNGs of the same dimensions can compress by very different amounts: a flat-color icon will shrink far more than a gradient-heavy screenshot.
PNG vs. JPEG vs. WebP: Which Format Should You Use?
PNG is the right choice when you need transparency or sharp edges — logos, icons, screenshots, and diagrams with flat colors and text. JPEG usually works better for photographs, since its lossy compression removes detail the eye barely notices and produces much smaller files for that kind of image. WebP is a newer format that supports both lossy and lossless compression plus transparency, and it typically beats PNG on file size at the same visual quality.
If your image doesn't need transparency, converting it to JPEG or WebP first will almost always produce a smaller file than compressing the PNG alone — try our PNG to JPG converter or JPG compressor to compare.
Features of our PNG Compressor
Everything you need to compress, optimize and reduce PNG image file size online.
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Transparent PNG Compression
Reduce PNG file size while preserving transparent backgrounds — ideal for logos, stickers, icons, and web graphics that need to sit on any background color.
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PNG Optimization Without Quality Loss
Optimize PNG images without a noticeable drop in quality. Unnecessary data is removed and pixels are re-encoded more efficiently for faster-loading websites and uploads.
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Compress PNG to a Target File Size
Need your PNG under 100 KB, 200 KB, or another custom limit? Set your target size and the tool compresses your PNG images to fit automatically.
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Batch PNG Compression
Upload and compress multiple PNG images at once, saving time when optimizing entire folders of screenshots, graphics, or transparent images together.
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Private and Automatically Deleted
Uploaded files are processed securely and automatically deleted from our servers within 24 hours — or delete them yourself immediately after compressing.
Frequently Asked Questions
Common questions about PNG compression, transparency, and reducing PNG image size online.
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- Click Select Images, upload your PNG files, and the tool automatically optimizes them for smaller file size while preserving image quality and transparency.
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- Yes. Transparent backgrounds and alpha channels are preserved during PNG compression. Your logos, icons, stickers, and transparent graphics remain fully transparent after optimization.
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- PNG images use lossless compression and support transparency, which keeps image details sharper but usually results in larger file sizes compared to JPEG images.
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- Yes, using compressjpg.net you can compress PNG images under 100 KB, 200 KB, or any size with Target Size mode. This is useful for online forms, websites, and app uploads with file size restrictions.
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- No. PNG optimization reduces file size without changing the image dimensions or aspect ratio. Most images retain the same visual quality after compression.
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- Yes. Uploaded and processed PNG files are automatically deleted from our server within 24 hours. If you'd like them removed sooner, you can click the delete button right after compressing your images.
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- WebP usually produces a smaller file than PNG at the same visual quality while still supporting transparency. If you don't need to keep the PNG format for compatibility reasons, converting to WebP first will often shrink the file further than PNG compression alone.