OneWeb is an online PNG compressor. Our online tool reduces the size of PNGs significantly. Depending on the input file, we can reduce the size up to 70% while retaining good quality. Our tool preserves alpha transparency and the PNGs are compatible with all web browsers.
PNG or Portable Network Graphic format is a graphic file format that uses lossless compression algorithm to store raster images. It uses 2 stage compression methods. It is frequently used as web site images rather than printing as it supports only the RGB color model. So CMYK color images cannot be saved as PNG image.
PNG (Portable Network Graphics) is a lossless image format that preserves every pixel exactly as captured. This makes it ideal for screenshots, logos, graphics with text, and any image requiring transparency. However, lossless quality comes at a cost — PNG files are typically 5-10x larger than equivalent JPGs.
OneWeeb's PNG compressor uses two strategies to reduce file size. First, it optimizes the PNG encoding by finding the most efficient compression filters for your specific image data. Second, for aggressive compression targets, it intelligently scales down image dimensions while preserving clarity and the alpha channel (transparency).
All processing happens locally in your browser using the HTML5 Canvas API. Your images are never uploaded to any server — making this tool safe for confidential designs, client work, unreleased product images, and sensitive documents.
Lossless compression reduces file size without changing any pixel data. It works by finding more efficient ways to encode the same information. Typical savings: 10-30%. Best for images that must remain pixel-perfect, like technical diagrams, medical imaging exports, and print-ready graphics.
Lossy compression achieves much greater size reductions (up to 80%) by reducing color palette depth and applying subtle changes that are imperceptible to the human eye. Best for web images, social media graphics, and email attachments where absolute pixel perfection is not critical.
When you need a specific file size target, use our dedicated tools: PNG to 100KB or PNG to 50KB. These use smart dimension scaling to guarantee your image fits within the target while maintaining maximum visual quality.
Use PNG when your image needs transparency (logos on colored backgrounds), contains text or sharp edges (screenshots, UI elements, diagrams), or requires lossless quality for editing and archival. PNG is the standard format for web graphics, app icons, and design assets.
Use JPG for photographs, complex images with gradients and many colors, and when file size is the top priority. JPG achieves 60-80% smaller files than PNG for photographic content. If you need to compress photographs, try our JPG compressor instead.
For modern web development, consider WebP format which offers both lossless and lossy compression with transparency support and smaller file sizes than both PNG and JPG. You can convert between these formats using our WebP to PNG and PNG to JPG converters.
With lossless compression, no — every pixel is preserved exactly. With size-targeted compression (like our 50KB and 100KB tools), the image dimensions may be reduced, which technically changes the image but preserves sharpness at the new size.
Lossless compression typically saves 10-30%. With dimension scaling, you can achieve any target size. A 5MB PNG screenshot can easily be compressed to 100KB or even 50KB while remaining readable.
Yes. Unlike TinyPNG and most online compressors that upload files to their servers, OneWeeb processes everything in your browser. Your files never leave your device, making it safe for NDA-protected designs, unreleased product images, and sensitive documents.
Yes. Select multiple PNG files at once or drag and drop a batch. Each file is compressed individually and you can download them one by one.
Yes. The alpha channel (transparency data) is fully preserved. Logos, icons, and graphics with transparent backgrounds will maintain their transparency after compression.