Compress PNG Online
Reduce PNG file size by up to 70% — free, fast, no signup needed
Drop PNG files here or click SELECT FILES
Up to 20 files · 10 MB each
What Is PNG Compression?
PNG is a popular image format for logos, icons, screenshots, and anything with a transparent background. The problem is that PNG files tend to be large — they often store more color data than what the human eye can actually distinguish.
This tool uses palette quantization to reduce the number of colors stored in the file — typically from millions down to 256 or fewer — while keeping the image visually identical. For most graphics, the result looks exactly the same at a fraction of the size.
- ✓ Free — no account, no watermark, no hidden limits
- ✓ Up to 20 files at once, 10 MB each
- ✓ Transparent backgrounds are preserved
- ✓ Files deleted automatically after 1 hour
How to Compress a PNG File
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1
Select your files
Click Select Files or drag and drop PNG files into the upload area above. You can upload up to 20 at once.
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2
Click Compress
The tool processes each file and shows you the exact size reduction. Use the Colors slider to fine-tune quality vs. file size.
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3
Download
Save files one by one or click Download All to get a ZIP with everything inside.
Why Reduce PNG File Size?
🚀 Faster pages, better rankings
Images are usually the heaviest part of a page. Google's Core Web Vitals measure page speed directly, and large images hurt your LCP score. Smaller files mean faster load times, which means better search rankings and lower bounce rates.
💾 Less storage and bandwidth
For developers managing hundreds of assets, cutting file sizes by 50–70% adds up fast. Lower CDN costs, faster deploys, and smaller repos — all from a few clicks.
Why Compress PNG Images?
Every byte counts when it comes to web performance. Images are typically the heaviest assets on any page, and PNG files — while excellent for quality — can be far larger than they need to be. Here's why reducing their size matters.
🚀 Faster website loading speed
Google's Core Web Vitals measure how fast the main content of your page loads (LCP — Largest Contentful Paint). If that content is a large PNG, your score takes a hit. Compressing images is one of the most direct ways to improve page speed without changing your code or hosting setup. A faster page also means users are less likely to leave before it finishes loading.
💰 Lower bandwidth and storage costs
Whether you're paying for a CDN, an object storage bucket, or shared hosting — you're paying per gigabyte. For a site serving thousands of images a day, cutting each file size by 50% cuts your bandwidth bill roughly in half. The savings compound quickly for apps, e-commerce sites, or any platform that handles a lot of user-generated image uploads.
📱 Better experience on mobile and slow connections
More than half of web traffic comes from mobile devices, many of which are on 4G or slower connections. Large PNG files take noticeably longer to load on these networks, which directly hurts engagement. Smaller files load fast everywhere — whether someone is on fibre at home or a patchy connection on the go.
How PNG Compression Works
Not all PNG compressors work the same way. Understanding the difference helps you know what to expect from your results.
Palette quantization (what this tool uses)
A full-color PNG can contain up to 16 million distinct colors. In practice, most images — especially logos, icons, and screenshots — use far fewer. Quantization analyzes the image and finds the smallest set of colors that can represent it accurately, then rebuilds the file using only those. The visual difference is often invisible, but the file can be 40–70% smaller.
Metadata removal
PNG files often carry hidden data that serves no purpose on a website — creation timestamps, software signatures, color profile information, and sometimes GPS data from cameras. This tool strips all non-essential metadata automatically, which alone can shave a few percent off file size without touching a single pixel.
The Colors slider
After compressing, you can use the Colors slider in the comparison view to fine-tune the result. Setting it lower (e.g. 64 or 32) creates a smaller file but with fewer colors — which may be visible in complex images. Setting it to 256 gives the best quality. Try dragging the before/after slider to see exactly how your image looks at each setting before you download.
PNG vs Other Image Formats
PNG is not always the right format — and it's not always the wrong one. Here's a quick guide to when PNG makes sense and when another format would serve you better.
PNG vs JPEG
JPEG is built for photographs. It stores images using lossy compression that works brilliantly on smooth color gradients but creates visible artifacts on sharp edges, text, and flat colors. PNG handles those cases perfectly — which is why it's the standard format for logos, icons, diagrams, and screenshots. If your image has text or a transparent background, stick with PNG. If it's a photo with no transparency, JPEG will almost always be smaller.
PNG vs WebP
WebP is a modern format developed by Google that generally produces smaller files than PNG. It supports transparency and works in all modern browsers. If you control your tech stack and your users are on modern browsers, WebP is a solid choice. That said, PNG remains more universally supported — some older tools, email clients, and third-party platforms don't accept WebP, while PNG works everywhere.
PNG vs GIF
GIF is limited to 256 colors and was designed in 1987. PNG replaced it for static images years ago — PNG supports millions of colors, better transparency, and compresses more efficiently. The only reason to use GIF today is for animated images, since PNG doesn't support animation. For everything else, PNG wins.
Tips for Getting the Best Results
Use PNG for the right images
PNG compression works best on graphics with flat colors, sharp edges, and transparency — logos, icons, UI screenshots, and illustrations. For full-color photographs, JPEG or WebP will typically produce smaller files with no visible quality difference.
Start with the maximum colors setting
The default setting (256 colors) gives you the best quality-to-size ratio for most images. Only lower the slider if you need an even smaller file and can accept a slight reduction in color depth — always check the before/after comparison first.
Compress before uploading to your site
Most CMS platforms (WordPress, Shopify, Webflow) do not automatically optimize the images you upload. Running your PNGs through this tool before uploading ensures visitors always get the smallest possible file, regardless of platform.
Batch compress for efficiency
If you have multiple files, upload them all at once — up to 20 at a time. You can then download them individually or as a single ZIP file. This is especially useful when preparing a full set of assets before a website launch.
Privacy & Security
Uploading images to an online tool requires trust. Here's exactly what happens to your files on this site.
Encrypted transfer
All file uploads and downloads happen over HTTPS. Your images are never transmitted in plain text.
Automatic deletion
Uploaded files are permanently deleted from our server after one hour. Nothing is kept longer than needed to serve your download.
No sharing, no tracking
Your images are never viewed by staff, sold to third parties, or used to train AI models. We process them only to produce your compressed output.
No account required
We don't collect your name, email, or any personal information. Open the page, upload, compress, download — done.
Frequently Asked Questions
Does compressing a PNG reduce image quality?
For logos, icons, and screenshots — no visible difference in most cases. The tool reduces the number of colors stored in the file, not the visual content. For photos with thousands of subtle gradients, you may notice very slight smoothing at aggressive settings. The before/after slider on this page lets you judge the result yourself before downloading.
How much smaller will my PNG file be?
Typically 40–70% smaller for logos and UI graphics. Photos with many colors usually see 15–30% reduction. The exact saving is shown on each file card after compression, so you know the result before you download.
Is it safe to upload images to this site?
Yes. All uploads happen over HTTPS. Your files are processed on the server and deleted automatically within one hour. We never view, store permanently, or share your images with any third party.
Does it work with transparent PNG files?
Yes. Transparency (alpha channel) is fully preserved. Logos and graphics with transparent backgrounds come out exactly as they went in — just smaller.
Can I compress multiple PNG files at once?
Yes — upload up to 20 PNG files in one go. After compression you can download them individually or use the Download All button to get a single ZIP file containing everything.
What does the Colors slider do?
The Colors slider controls how many distinct colors are kept in the compressed file (2–256). A lower number means a smaller file but potentially less color detail. 256 gives the best quality. The before/after comparison updates automatically as you move the slider, so you can find the right balance before downloading.
Is there a file size limit?
Each PNG file can be up to 10 MB, and you can upload up to 20 files per session. This covers the vast majority of real-world use cases — from small icons to high-resolution graphics.