Cropping a PNG is quick once you know the steps — and the key is keeping the transparent background intact. Here is the fast online method, plus how to do it in common desktop and phone apps.
A browser-based cropper is the simplest option because there is nothing to install and the work stays on your device. The process is the same on desktop and mobile.
Go to the home tool and drag your PNG onto it, or tap Choose image.
Drag the crop box and pull the handles. Lock a ratio (1:1, 16:9, 4:5) or type an exact pixel size.
Leave the format on PNG (or WebP). The checkerboard behind the canvas shows the see-through areas.
Press Download. Your cropped PNG is saved, and a copy is kept in your private on-device history.
The single most common mistake is cropping in a tool that flattens the background. PNG stores an alpha channel; if the editor draws your image onto a white canvas before saving, that transparency is gone. To avoid it, crop in an alpha-aware tool and export as PNG or WebP. JPG cannot hold transparency, so only choose it when a solid background is fine. See crop a transparent image for more.
For round avatars and icons, a circular crop with transparent corners is what you want. Switch on circle mode (or use the dedicated circle cropper), center your subject, and export a PNG. Because the corners are transparent rather than white, the round image sits cleanly on any background. A 512×512 PNG is a safe size for most profile slots.
When a slot needs specific pixels — an icon, a banner, a thumbnail — type the width and height instead of dragging. Lock the aspect ratio to keep the shape, or set width and height independently. The crop by size tool is set up for exactly this.
On Windows, the Photos app and Paint can crop, though watch that Paint can drop transparency on save. On Mac, Preview crops with the rectangular selection and keeps PNG transparency. In Photoshop or GIMP, use the Crop tool and export as PNG. On phones, the built-in Photos editors crop quickly but rarely keep transparency, so for transparent PNGs the online tool is usually the safer choice.
Cropping already shrinks a PNG by removing pixels, but you can go further. Export as WebP for a markedly smaller file at similar quality, which every modern browser supports. If the image has no transparency, a JPG is smaller still. For flat graphics and logos with few colors, a PNG-8 (256-color) version from an image editor cuts size with no visible loss. Avoid exporting at a larger pixel size than you need — a 512×512 avatar does not benefit from being 2000×2000. Because this tool cuts at full resolution you stay sharp; just match the output size to where the image will actually be shown.
Use a browser tool: open the PNG cropper, drop in your file, drag the frame and download. No software and the transparency is kept.
Crop in a tool that preserves the alpha channel and export as PNG or WebP. Avoid JPG, which fills transparency with white. More here.
Yes. The online cropper is mobile-first — drag the handles with your finger and download straight to your device.
Switch on circle crop (or use the circle cropper) and export a PNG with transparent corners.
No. Cropping removes pixels outside the frame; the pixels you keep are untouched unless you deliberately set a smaller size.