Compress PNG to 100KB Online

No — 100 KB is a target, not a guarantee. The tool re-encodes your image repeatedly at lower quality until the measured output is at or below 100 KB, then stops. The number you see in the result panel is the real byte count of the file you download, so you can always confirm it before uploading anywhere.

If a very large or very detailed photo can't reach 100 KB at a reasonable quality, you'll get the smallest file the encoder could produce along with a note explaining it. Reducing the pixel dimensions first is the fastest fix: halving width and height removes about three quarters of the pixels and usually drops the file far below the target.

No. Everything runs in your browser using the Canvas API. The file never leaves your device, there is no account to create, and nothing is stored after you close the tab.

There is no watermark and no daily limit. Because processing is local, the only real constraint is your device's memory, which the tool checks before it starts.

Because PNG has no quality setting. Re-encoding a PNG as a PNG can shave a few percent at best and often produces a larger file. To reach a specific target size the image has to be written in a lossy format, so that is what this page does — and the result panel always tells you the format you're downloading.

Lossy formats have no alpha channel here, so transparent pixels are filled with the background colour shown in the controls (white by default). Change it before running if your image sits on a dark page.

Use the PNG Compressor for lossless re-encoding, or reduce the pixel dimensions with the Resize Image tool — fewer pixels is the only reliable way to make a lossless PNG meaningfully smaller.