PNG Image Compressor
Compress PNG images online to reduce file size while preserving image quality and transparency.
Compress PNG Images
Compress PNG images online without installing software. Upload one or more PNG images, choose the compression level and download smaller PNG files while preserving transparency.
What is a PNG Image Compressor?
A PNG image compressor reduces the storage size of PNG files using lossless compression. Unlike lossy image compression, PNG compression can preserve the image data and transparency.
The iToolsEra PNG Image Compressor lets you upload multiple PNG images, choose a compression level and download the optimized PNG files.
How does PNG compression work?
PNG uses lossless compression. The compression level controls how much processing effort is used to reduce the file size. Higher levels can take longer but may produce a smaller file.
Because the process is lossless, the visual image data and transparency are preserved.
Tips for reducing PNG file size
- Use compression level 6 as a practical default.
- Try level 9 when maximum compression effort is more important than processing time.
- Keep PNG when transparency or lossless image data is important.
- Use the estimated size shown before compression to choose a suitable level.
Frequently Asked Questions
Yes. You can select multiple PNG images and compress them together.
PNG compression is lossless. The compression process reduces file size without intentionally reducing the image quality, although the resulting file size can vary depending on the image and compression level.
Yes. The compressor preserves PNG alpha transparency while re-encoding the image.
The tool accepts standard PNG images.
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