PNG converter and compression
JPG, WebP and GIF are turned into PNG. A finished PNG can be compressed losslessly or by reducing the number of colors. The pixel size does not change. Everything happens in the browser, files are not uploaded anywhere.
PNG, or Portable Network Graphics, is a raster graphics format with lossless compression. It was created in the mid-1990s as a free replacement for the GIF format and later became an international standard. PNG files preserve every pixel of the source image exactly.
The format is based on the Deflate compression algorithm, applied after preliminary filtering of pixel rows. Full-color images, grayscale and an indexed palette of up to 256 colors are supported. A separate alpha channel makes it possible to store smooth transparency with 256 levels.
Converting an image to PNG makes sense for logos, icons, diagrams, screenshots and any graphics with sharp edges and text. Saved as JPG, such images get blurred edges, while in PNG they stay crisp. A transparent background is preserved unchanged.
The drawback of the format is the large size of photo files, because lossless compression cannot substantially reduce images with many fine details and noise. For camera shots JPG or WebP is chosen more often, and PNG is kept for cases where accuracy matters.
The page offers 2 ways to reduce the size of a PNG. The first is lossless optimization, which selects more efficient compression parameters. The second is reducing the number of colors, which converts the image to an indexed palette. The second way gives a bigger saving but may change shades.
The conversion is performed directly in the browser, and the source files are not sent anywhere. You can upload several images at once, compare the size before and after processing, and download the result. If the compressed file turns out larger than the original, the page tells you so.