Resize PNG Online — Free, Fast & Private
This page runs the MiniPx resizer with PNG preselected as the output, tuned for the files PNG is actually used for: screenshots, logos, interface mockups, sprites, and diagrams. One honest definition before anything else, because most "PNG resizer" pages skip it: the control here is a maximum width. You pick how wide the image is allowed to be, and the height follows from the aspect ratio — a proportional downscale, not a free width-and-height form. If the goal is a fixed frame such as 500×500, get the shape first with the PNG cropper and scale second. And it only scales down: stretching pixels upward just blurs them, so when a PNG needs to grow, the AI upscaler is the right tool, not this one.
Within that honest boundary, everything about the operation suits PNG well. The resample runs at full precision on the decoded pixels, the export is written by the browser's native PNG encoder, and the before/after size readout updates as soon as the render finishes — all locally, with the file never leaving your machine.
Lossless in, lossless out
PNG has no quality dial. The encoder is lossless by specification, which changes what "resize without losing quality" means compared with JPEG. When you shrink a JPEG, two separate things degrade it: the resample that computes the smaller grid of pixels, and the lossy re-encode that writes the result. With PNG only the first applies. The resample genuinely does compute new pixel values — a 2000px-wide image scaled to 1000px cannot keep every original pixel, and no tool can claim otherwise — but once those values exist, the PNG file stores them exactly. Resize the output again next month and there is no accumulating encoder damage, no generation loss, no slowly-softening text. That is also why the quality presets in the tool do nothing to a PNG export's pixels: with PNG selected as the format, size reduction comes from dimensions, and the encode itself is a faithful copy.
Transparency rides through the resample
A PNG's alpha channel is scaled with the same care as its colour channels. Shrink a logo that sits on transparency and what you get back is the same logo, smaller, still on transparency; the soft anti-aliased fringe around its edges is resampled rather than chopped, so it continues to sit cleanly on any colour you place it over. This matters because plenty of quick resize paths — pasting into an editor with a white canvas, or exporting through a JPEG-only pipeline — silently flatten transparency and hand you a logo in a white box. Keep PNG (or WebP, which also carries alpha) selected and that never happens here. One thing to watch at aggressive reductions: hairline elements that are one or two pixels wide in the original, such as thin dividers in a UI mockup, can fade as they shrink below a pixel. If a sprite or icon reads badly at the target size, that is a redraw problem, not a resize setting.
For PNG, dimensions are the file-size dial
Because the format refuses to throw information away, a PNG's byte count is tied to how many pixels it stores. Halve the width and the height and roughly three quarters of the pixels are gone — usually the single biggest reduction available to a PNG, far beyond anything an optimiser can do to the full-size file. High-DPI displays make this concrete: a modern laptop captures screenshots at two or three device pixels per interface point, so the "small" window you grabbed may be nearly 3000px wide while the document or ticket it lands in shows it at 700. All of those extra pixels are weight the reader never sees. Cut dimensions here first, then let the PNG compressor squeeze the remaining bytes — in that order, since compressing pixels you are about to discard is wasted effort.
Keep PNG, or leave for WebP?
Stay with PNG when the destination demands it: assets checked into a codebase, images headed for further editing, pixel art, or any workflow where a later tool expects the format. Switch the output chip to WebP when the file's final home is a web page — WebP keeps the transparency and typically writes fewer bytes for the same content. And if what you are resizing is a photograph that merely happens to be saved as PNG, the container is the real problem: photographic gradients are what lossy compression handles best, so run it through the JPG resizer instead and collect a dramatically smaller file.