Resize a PNG and preserve transparency
Change the pixel dimensions of a single-frame PNG without stretching it. Alpha transparency is preserved when present.
Enter a width, a height, or both. Two values define a bounding box rather than forcing an exact distorted size.
How to resize a PNG
Upload the PNG
Choose one valid, single-frame PNG image.
Set the dimensions
Enter a maximum width, height, or both.
Download the resized PNG
Save the proportional PNG with supported transparency retained.
How PNG resizing works
NetroDoc calculates the missing dimension from the original aspect ratio. With width and height together, the result fits inside the requested box without cropping.
The output is encoded as PNG with lossless image compression. Animated PNG files are rejected instead of silently discarding frames.
When to resize PNG
Logos and graphics
Resize transparent graphics for a website or document.
Screenshots
Reduce screenshot dimensions while avoiding JPEG artifacts.
Interface assets
Prepare a proportional PNG for a layout or upload limit.
Temporary server-side processing
The uploaded image is processed in a temporary working directory and is not intentionally sent to a third-party conversion API.
Temporary files are removed after the response is completed or when processing fails. No account is required.
Privacy →Resize PNG FAQ
Is transparency preserved?
Yes, supported alpha transparency is retained.
Will NetroDoc stretch the PNG?
No. The original aspect ratio is preserved.
Can I resize an animated PNG?
No. Multi-frame PNG files are rejected to prevent accidental frame loss.