Compress PNG to 100KB Online Free

The compressor groups colors into a smaller palette and encodes the pixels using those entries. That can reduce the information needed for each pixel and help repeated patterns compress efficiently. Although PNG encodes the resulting palette image losslessly, reducing the palette is itself a lossy step: nearby source colors can become the same output color. Smooth gradients, shadows and subtle brand colors deserve a close look.

Transparency is represented in the palette so the tool can retain a transparent background. Semi-transparent edges may still change during quantization, so inspect them against both light and dark surfaces if the graphic will appear in different themes. The preview’s checkerboard helps reveal empty areas. This is an optimization tool, not a guarantee of pixel-identical output or exact preservation of every alpha value.

The target search tries palette settings before reducing dimensions, because scaling a screenshot can make text harder to read. If palette reduction is not enough, it may shrink the picture proportionally. The result indicates whether the target was reached and whether dimensions changed. Read the smallest text in the downloaded image at the size it will actually be displayed, not only in a scaled preview.

Crop a screenshot to the relevant window or region before compression when that does not remove necessary context. Avoid capturing a large desktop just to show a small message. If the result cannot fit without losing essential detail, use a larger allowance in Compress PNG or choose another accepted format. A tiny output is not useful if the recipient cannot understand the information it contains.

Keep PNG for a workflow that explicitly requires it, for a transparent asset, or for graphics whose edges look better in that format. This page does not silently switch to JPG to make the size smaller. If the source is a photograph without transparency, PNG to JPG may be appropriate when the destination accepts JPEG. That conversion changes the format and removes alpha transparency.

For web publishing that supports modern formats, compare PNG to WebP. WebP can retain transparency, but a format conversion is a separate choice from reaching a byte target. Resize Image helps when you need a particular displayed width or height. Preserve a full-resolution PNG master so that future exports do not repeatedly quantize an already reduced palette.

The PNG optimizer runs locally, without registering an account or sending your file to a processing server. It uses the browser’s compression capabilities for palette PNG output. If those capabilities are unavailable, it falls back to the browser’s ordinary PNG encoder and may need smaller dimensions to fit. The output remains PNG, and the target status tells you whether the attempted file actually meets the allowance.

Processing speed depends on dimensions, color complexity and device memory. A large screenshot can take longer than a small icon even if the two source files have similar byte sizes. Keep the tab open while working. If your original is already under the maximum and no dimension change is requested, the original is returned untouched, retaining its existing colors, transparency and metadata instead of quantizing it unnecessarily.