Compress PNG
Compress PNGs online for quick sharing, fast uploads, and lighter storage, with a quality slider you control. The compressor is free, needs no signup, and runs online.
Free
no account needed
Frankfurt
stored in the EU
2 hours
then files are deleted
Your files
Add them here, we do the rest
Drag and drop your files here, or import from:
Upload files up to 100 MB in PNG
What is PNG compression?
Compressing a PNG here happens in two stages: the encoder re-filters and re-deflates the pixel data, then reduces the colour palette by as much as the Quality setting allows.
The process employs a two-stage approach: first, applying prediction filters that analyze pixel relationships across each scan line, then implementing DEFLATE compression to eliminate redundant data patterns.
The Quality slider sets how many colours the palette keeps, which is where the real saving comes from — re-deflating alone rarely beats a file that is already well encoded. Transparency is preserved throughout.
The compression algorithm evaluates multiple filter types (None, Sub, Up, Average, and Paeth) for each row of pixels, selecting the optimal method that produces the most compressible data sequence for that specific image section.
Why compress a PNG?
- 01
The implementation of PNG compression addresses several critical technical requirements in digital workflows.
- 02
Web optimization demands reduced PNG size to minimize HTTP request payload, directly affecting Time To First Byte (TTFB) metrics and overall page rendering performance.
- 03
Network bandwidth constraints necessitate efficient data transmission, particularly for image-heavy applications where unoptimized files create bottlenecks.
- 04
Storage infrastructure benefits from the ability to downsize PNG assets, maximizing available capacity and reducing backup volume requirements.
- 05
Additionally, content delivery networks operate more efficiently with compressed assets, decreasing edge server load and improving global distribution performance. The compressed PNG process maintains the format's technical advantages while optimizing resource utilization across digital ecosystems.
Frequently asked questions
Still have questions? Contact support.
Will compressing my PNG make it look bad?
It depends on the Quality setting, because compression here reduces the image's colour palette. Flat graphics, logos and screenshots stay visually identical; photographs and gradients can show banding at low settings, so keep the slider high for those. Whatever you choose, the tool never hands back a file larger than the one you uploaded — if it cannot beat your original, you get your original back.
How much smaller will my file be?
Results vary depending on the image content. Simple graphics with large areas of flat color can see reductions of 50–80%, while complex photographs with many unique colors may compress by 10–30%. The tool automatically selects the optimal filter strategy for each row of pixels to maximize compression.
What happens to the transparency in my PNG?
Transparency is fully preserved. PNG compression maintains the complete 8-bit alpha channel, so semi-transparent pixels, drop shadows, and smooth edges remain intact after compression.
Does this work on scanned PNGs?
Yes. Scanned documents saved as PNG files can be compressed effectively. However, scans tend to contain more noise and unique pixel patterns, which limits how much the file size can be reduced compared to digitally created graphics.
Why did the file size not change very much?
Some PNGs are already well-optimized. If your file was exported from a tool that applies strong compression by default, there may be little redundant data left to remove. Images with high color complexity and photographic content also compress less than simple graphics.
My PNG has metadata I want to keep. Will compression remove it?
Standard PNG compression focuses on the image data stream and does not strip metadata chunks such as text annotations, color profiles, or timestamps. Your embedded metadata remains intact through the compression process.