Reduce PNG file size by comparing multiple encoding methods and selecting the smallest result. Resize image width when needed and review the output before downloading.
PNG — Processed locally in your browser
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PNG is a common choice for screenshots, interface graphics, logos, and images that need transparency. The downside is that some PNG files can be much larger than expected, especially when their dimensions are generous or their image data is difficult to compress. The PNG Compressor helps you test several ways of encoding the image and select the smallest result produced by those methods.
Unlike a JPG compressor, this tool does not provide a conventional quality slider. It compares alternative PNG outputs automatically. You can also specify a target width, which is useful when the source image has more pixels than your page or design actually requires.
The tool compares three outputs: a lossless PNG encoding, an encoding that uses a palette of up to 256 colors, and the browser's standard PNG export. It then selects the smallest successful candidate. This gives the tool several approaches to try rather than relying on a single compression setting.
The distinction between these methods matters. Lossless encoding aims to reduce file size without discarding image information. A limited color palette can reduce the amount of data further, but may also change colors or gradients. The smallest file is not automatically the best-looking result for every image, so a visual check remains part of the process.
Consider a screenshot containing interface elements and small labels. Reducing its file size may make it easier to include in an article or help page, but the text must remain clear. A logo with a transparent background has a different requirement: you may care more about clean edges and correct colors than squeezing out the last few kilobytes.
The same principle applies to illustrations, diagrams, and design assets. The intended use should guide your choice. An image used at a smaller display size may benefit from resizing, while a graphic that must be displayed at its original dimensions may need to retain its existing width.
The target-width field accepts values from 50 to 8,000 pixels. Enter 0 to keep the original width, or specify a target width to scale the image while retaining its aspect ratio.
The tool can scale up as well as down. However, enlarging an image does not restore missing detail and can produce a larger output file. When the goal is web optimization, choose a width that fits the actual display area rather than increasing dimensions without a clear reason.
0 if you need the current dimensions, or set a suitable target width.A lower file size is only useful when the image remains fit for purpose. A small palette may be suitable for some flat-color artwork but may produce visible changes in a graphic with subtle gradients. Screenshots with small text and logos with precise brand colors deserve particular attention.
When the source dimensions are much larger than the display area, resizing can be a more predictable part of optimization. If you want to experiment with another image format, use the PNG to WebP converter. For dimension changes without focusing on compression methods, try the Image Resizer. You can also use the broader Image Compressor for other supported formats.
Is the output always lossless?
Not necessarily. The tool compares a lossless encoding with a palette-based option and standard PNG export, then chooses the smallest candidate. A palette-based result may change some colors, so review the downloaded image when exact visual appearance matters.
Why is there no quality slider?
Instead of asking you to choose a quality percentage, the tool automatically compares several PNG encoding methods and selects the smallest successful output.
Should I resize a PNG before compressing it?
If the image is significantly wider than its intended display area, resizing can help reduce the amount of image data. If the full dimensions are required, keep the original width and evaluate the compression result on its own.
Can compression make a PNG file larger?
Some images do not benefit from a new encoding at their original dimensions. In that situation, the tool can keep the original file when the generated output is not smaller.