Compress PNG Online Without Losing Transparency

Yes, transparency is always preserved. Our tool protects the alpha channel at all times so your logo or graphic keeps its transparent background. At standard compression, soft gradients and drop shadows are optimized almost imperceptibly; if you set the quality slider to 90% or higher, the alpha channel remains pixel-for-pixel identical to the original.

100% safe and private for corporate use. Your logos, brand assets, and confidential files are processed locally in your browser using WebAssembly. We never upload your data to external servers. Ideal for agencies and companies handling sensitive materials under NDA.

PNGs are heavier because they store every pixel with exact precision, including the transparency channel, without removing any data (lossless compression). This makes them perfect for logos, icons, and crisp text, but results in large files. Our tool removes redundant colors that the human eye cannot perceive, reducing up to 70% of the file size without affecting visual quality or transparency.

This usually happens for two main reasons:

• The image is already heavily optimized: if the file was previously compressed, there are no redundant bytes left to remove without harming image clarity.
• It's a photograph or the format isn't ideal: PNG is a lossless format tailored for logos, icons, and flat graphics. If your image is a photo (or originally came from a JPEG), saving it as PNG will naturally make it heavier since it cannot use lossy compression tricks. It can also happen if the original already used an indexed color palette (PNG-8).

It depends on your image and where you set the quality slider: in smart mode (below 90%) you can reduce between 40% and 70% of file size, which is ideal for logos and flat graphics. If you push the slider to 90% or higher (lossless mode), savings are typically between 10% and 30%, keeping your exact original palette intact.

PNG is ideal for logos, icons, illustrations, graphics with text, screenshots, and any image requiring transparency or crisp edges. It's not the best choice for photographs (use JPG or WebP for photos). PNG excels with solid colors, defined lines, and transparent areas where you need maximum sharpness.

WebP is the best option for modern websites because it offers up to 30% more compression with the same quality and supports transparency, improving load speed and SEO. However, PNG is needed for universal compatibility in emails, Office documents, and as a fallback. Recommendation: use WebP for your website with compressed PNG as backup; for logos in emails or documents, use optimized PNG.

Not noticeably to the human eye, though technically it depends on your selected quality setting:

• Intelligent compression (recommended, up to 70% savings): Below 90% quality, our tool applies smart color quantization. It removes redundant color shades that human eyes cannot detect, while keeping edges and transparency 100% sharp. For logos, icons, and web graphics, the visual difference is virtually invisible.
• 100% Lossless mode (90% to 100% quality): If you set the quality slider to 90% or higher, the tool disables color quantization and uses pure lossless optimization (via OxiPNG). Your color palette and pixels remain completely untouched, though file size reduction will be more moderate (typically 10% to 30%).