What does a PNG compressor do?

This tool shrinks a PNG's file size in two ways: resizing its pixel dimensions, and reducing the number of distinct colors it uses. Both happen locally in your browser using the Canvas API, then the result is re-encoded as a new PNG file.

Is this PNG compressor really free?

Yes, completely free with no restrictions. No sign-up, no account, no credit card, no daily limits, no watermark. Compress one image or a hundred — the tool works identically every time.

Is my image uploaded to a server?

No. The file is read directly in your browser and processed with the Canvas API. It is never sent over the internet, never stored on any server, and never logged. Open DevTools (F12) → Network tab while using the tool to verify zero requests are made.

Will I lose image quality?

Resizing reduces the pixel dimensions, which is lossless for detail you no longer need but does reduce total detail. Color reduction is genuinely lossy — Light is subtle, Heavy is aggressive and best suited to flat graphics like screenshots and icons rather than photos.

Does it preserve transparency?

Yes. Color reduction only adjusts the red, green, and blue channels — the alpha (transparency) channel is left exactly as it was, so transparent backgrounds and soft-edged shapes are preserved at every setting.

Why is my compressed file still large?

Photographic PNGs with lots of gradients and noise compress less dramatically than flat graphics, since PNG's lossless encoding struggles with high-entropy pixel data. Try a smaller scale or a heavier color reduction, or consider a photo-oriented format like JPEG for photographs.

Is there a file size limit?

No artificial limit is imposed by the tool. Since everything runs in your browser without uploading, the practical limit depends on your device's available memory rather than a server restriction.

Does the tool work on mobile devices?

Yes. The PNG compressor works on any device with a modern web browser — phone, tablet, Chromebook, or desktop. Drag-and-drop falls back to tap-to-browse on touch devices, and all processing happens on-device.

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