PngOptimizer review
A focused lossless PNG optimizer with desktop and command-line access.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
PngOptimizer is an open-source desktop application for reducing PNG file sizes while preserving image data. It is aimed at users who want local image optimization on Windows or Linux, particularly those working with PNG files from desktop applications, screenshots, or command-line workflows. Alongside PNG optimization, it can remove unnecessary or incorrect PNG information, create PNG screenshots, and convert BMP, GIF, and TGA images into PNG. Animated PNG files are also supported.
Its strongest fit is a focused, lossless workflow rather than broad image-format compression. The supported formats include PNG, BMP, GIF, TGA, and APNG, but conversion is directed into PNG, so users looking for a general-purpose optimizer across multiple output formats may find the scope narrow. Metadata controls are available, and the software is distributed under the GNU General Public License. That combination suits users who prefer local processing and an open-source tool over a hosted compression service.
Platform coverage includes Windows and Debian/Ubuntu Linux, with a command-line version for script-oriented use. The Windows and Debian/Ubuntu packages make the product relevant to users who want a downloadable application rather than a browser-based workflow. However, the product is best understood as a specialized PNG utility: teams needing broad format coverage, hosted processing, or a clearly batch-centered workflow should consider another type of image compression software. Choose PngOptimizer when lossless PNG reduction, PNG conversion, APNG support, and local CLI access are the priorities.
PngOptimizer pros and cons
- Where it wins
- Lossless PNG optimization removes unnecessary or incorrect information
- Converts BMP, GIF, and TGA images into PNG
- Supports APNG, screenshots, CLI access, and Debian/Ubuntu packages
- Where it doesn't
- Its compression focus is limited to PNG workflows
- Batch-oriented workflows are not a clear fit
- It is a local tool rather than a hosted compression service
PngOptimizer fact sheet, pricing and score →
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