Compress PNG review
A free local PNG compressor with batch controls, comparisons, and transparency preservation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Compress PNG is a free web-based tool for reducing PNG file sizes. It is suited to designers, developers, marketers, and other users who need to compress PNG images without sending files away from their device. Users can select or drag up to 20 PNGs, adjust color-count settings, compare original and compressed sizes, and save files individually or in bulk. The service supports personal and commercial use.
Its main distinction is local browser processing through WebAssembly. Files are processed on the user’s device, and the service states that they do not leave it. That makes the workflow relevant for users who want browser-based compression with local handling. PNG transparency is preserved, while color quantization provides control over compression and palette size. After palette optimization, the tool applies lossless compression, combining an adjustable compression step with a lossless final stage.
Compress PNG keeps its scope narrow: it works with PNG images and runs through the web. The batch limit of 20 images is suitable for small groups, while larger jobs require a different workflow. The tool also centers on compression rather than broader image operations such as resizing or format conversion. Choose it when free, local PNG compression, transparency preservation, color controls, and simple batch saving are the priorities. Users who need broader format support or a larger production-oriented image workflow should choose a different type of tool.
Compress PNG pros and cons
- Where it wins
- Processes batches of up to 20 PNG images in the browser
- Preserves PNG transparency during compression
- Offers color controls and before-and-after size comparisons
- Where it doesn't
- Supports PNG files rather than multiple image formats
- Batch processing is capped at 20 images
- Web access is required to use the tool
Compress PNG fact sheet, pricing and score →
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