Resize PNG Images Online for Free
Resize your PNG files while keeping transparency and lossless quality intact. Set custom dimensions, scale by percentage, or use social-media presets. All processing happens in your browser.
Why Resize PNG with ImageSizr?
PNG is the go-to format for graphics, logos, icons, and screenshots that require transparency. ImageSizr.com resizes your PNG files while fully preserving the alpha channel, so transparent backgrounds stay transparent.
The output is lossless — no compression artefacts are added when you export as PNG. Every pixel stays sharp, making it ideal for UI elements, design assets, and any image where crisp edges matter.
Use the background toggle in the editor to switch between light and dark checkerboard previews and verify that transparent areas look exactly the way you expect before downloading.
All Resize Options Available
Enter custom width and height in pixels, centimetres, inches, or millimetres — non-pixel units convert automatically using 96 DPI. Scale by percentage with quick presets at 25%, 50%, and 75%.
Choose from social-media presets for Instagram, Facebook, Twitter/X, and YouTube to hit exact platform dimensions. Or pick a device preset ranging from HD to 4K, plus specific phones, tablets, and laptops.
Enable aspect-ratio lock to maintain proportions when changing one dimension. Disable it for independent width and height control.
Convert or Keep PNG
Export as PNG to preserve transparency and lossless quality — this is the default output for PNG files.
Need a different format? Convert to JPEG for smaller files when transparency is not needed. Choose a background colour to fill transparent areas (white by default, or pick any custom colour). Convert to WebP for modern web optimization with transparency support and significantly smaller file sizes. Or generate ICO icon bundles with multiple sizes from 16 to 256 px — perfect for favicons.
Related Tools
- Resize any image format — the general-purpose resizer for all file types.
- Batch resize multiple images — upload up to 5 PNGs and resize them all with shared settings.
- Crop images to a specific region — select the exact area you want to keep.
- Compress images to reduce file size — lower your PNG file size through quality adjustment.
Browse our image guides and tutorials for more tips on working with PNG files.
Learn More
Frequently Asked Questions
Is ImageSizr free to use?
Yes. ImageSizr is completely free with no account or sign-up required.
Are my images uploaded to a server?
No. All processing happens directly in your browser. Your images never leave your device, so your data stays private.
Will resizing my PNG lose transparency?
No. When you export as PNG, the alpha channel (transparency) is fully preserved. If you export as JPEG, transparency will be replaced with a background colour because JPEG does not support transparency.
How to resize a PNG image?
1. Upload your PNG file using drag-and-drop, browse, clipboard paste, URL, or cloud storage. 2. In the editor, enter new dimensions, use the percentage slider, or pick a preset. 3. Click Download to save the resized PNG.
Can I resize to exact social-media dimensions?
Yes. Switch to the Social Media resize mode and choose a platform (Instagram, Facebook, Twitter/X, or YouTube), then select the specific preset.
What units can I use for dimensions?
You can enter dimensions in pixels (px), centimetres (cm), inches (inch), or millimetres (mm). Non-pixel units are converted automatically using 96 DPI.
How do I keep the original proportions?
Enable the Lock Aspect Ratio option. When locked, changing one dimension automatically adjusts the other to maintain the original proportions.
Can I convert my PNG to another format while resizing?
Yes. Use the Format dropdown in the editor to switch between PNG, JPEG, WebP, or ICO before downloading.
What is the maximum file size?
Each file can be up to 10 MB.