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PngOptimizer

Free#71 of 85 in Image Compression Software

PngOptimizer: A focused lossless PNG optimizer with desktop and command-line access. Ranked #71 of 85 in Image Compression Software by our editors (3.0/10); pricing: Open source; best for linux and Windows PNG command-line users.

3.0/10Editor score

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PngOptimizer3.0 Visit PngOptimizer

At a glance

Editor score
3.0 / 10
Pricing
Open source
Best for
Linux and Windows PNG command-line users
Paid from
Free
Compression modes
Lossless
Facts checked
22 Sep 2026

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

Our verdict on PngOptimizer

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.

Your product? Our editors can test PngOptimizer in depth and publish a review, labelled as paid · from $149/mo →

PngOptimizer pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on psydk.org

PngOptimizer fact sheet

Free plan	Not verified
Paid from	Free
Compression modes	Lossless
Batch processing	Not verified
API access	Not verified
Max upload size	Not verified
Image resizing	Not verified
Supported formats	PNG, BMP, GIF, TGA, APNG
Metadata controls	Yes
Deployment	Desktop
Platforms	Windows, Linux
Built for	Solo, Small business (editorial estimate)
Pricing	Open source
Website	psydk.org
Facts checked	22 Sep 2026

Alternatives to PngOptimizer

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Featured on iTechGuides

PngOptimizer is listed in our Image Compression Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update