PNG resizing guide
Resize PNG graphics while protecting sharp edges and transparency
PNG is a strong choice for interface captures, diagrams, logos, and graphics with transparent pixels. Resizing changes its pixel grid, but choosing PNG output preserves the format’s lossless encoding and alpha transparency.
Keep transparency in the output
PNG supports partially transparent pixels. Keeping PNG selected as the output format allows those pixels to remain transparent after resizing. Converting the same image to JPG removes transparency because JPEG has no alpha channel.
Check the downloaded file in the destination application, especially when the graphic uses soft shadows or translucent edges. Some programs display transparent areas against white even when the alpha data is still present.
Use exact dimensions for interface graphics
Logos, icons, screenshots, and UI assets are often required at a specific width and height. Keep aspect ratio enabled when the destination accepts proportional dimensions. Turn it off only when the required canvas is exact and stretching is acceptable.
For a graphic that must fit an exact box without distortion, resizing alone may not be enough. Resize proportionally first, then use the crop tool to remove the excess area.
Understand PNG file size
PNG uses lossless compression, so it does not have a useful quality slider. Reducing the pixel dimensions often lowers file size, but detailed photographs may still produce large PNG files.
If transparency is not required and the image is photographic, JPG or WebP can be substantially smaller. For flat graphics, text, and limited-color artwork, PNG often remains crisp and efficient.
Prepare a batch of matching assets
Select several PNG files to apply one sizing rule across a set of icons, screenshots, product graphics, or presentation assets. Aspect-ratio mode protects each source shape while using the width or height you specify.
Every file is processed independently in the browser. The original PNGs remain unchanged, and each resized copy downloads with a descriptive filename.
