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 helps you reduce the file size of PNG images while preserving their image data and transparency through lossless compression. Smaller PNG files can be easier to upload, share, store, and use on websites.
With the free online PNG compressor from iToolsEra, you can upload up to 10 PNG images at a time, choose a compression level, review the estimated results, and download your optimized images. Each image can be up to 20 MB.
This tool is useful for compressing transparent graphics, logos, icons, screenshots, illustrations, and other PNG images. The amount of compression depends on the image itself, so some files may become significantly smaller while others may show only a modest reduction.
If you need to reduce PNG file size without converting your images to JPG, this tool gives you a way to optimize your PNG files while retaining the advantages of the PNG format.
How Does PNG Compression Work?
PNG compression reduces the amount of data needed to store an image without using lossy image compression. This helps preserve the original image information, including transparency.
Using the iToolsEra PNG Image Compressor is straightforward:
- Upload your PNG images. Select up to 10 PNG files, with a maximum file size of 20 MB per image.
- Choose a compression level. Use the shared compression-level control, which ranges from 0 to 9 and starts at level 6 by default.
- Review the estimates. Check the estimated compressed file size and potential size change before processing.
- Adjust individual images if needed. Fine-tune the compression level for a particular image when its estimated result needs further improvement.
- Compress and download. Process your images and download the optimized PNG files individually or together as a ZIP archive.
Higher compression levels generally involve more processing effort and may reduce file size further, but the result depends on the image. A higher level does not guarantee a smaller file in every case.
For the best practical result, compare the estimated output and processing time rather than assuming that the highest level is always necessary.
Tips for Reducing PNG File Size
- Start with the default compression level. Level 6 is the default setting. Use it as a starting point, then compare other levels if you need a smaller output file.
- Review the estimated file size. Check the estimated result before processing. This can help you decide whether further compression effort is worthwhile.
- Adjust images individually. Different PNG images can respond differently to compression. A setting that works well for one image may not be the best choice for another.
- Keep PNG when transparency matters. PNG is useful for transparent logos, icons, product graphics, and illustrations. Lossless PNG compression helps retain the image information and transparency that make the format useful.
- Do not expect every image to shrink by the same amount. The result depends on the image's existing data and characteristics. Some PNG files are already well optimized, so further compression may produce only a small reduction.
- Choose the right format for your use case. PNG is often suitable for transparent graphics and images that need lossless compression. JPG may be more appropriate for some photographs when lossy compression is acceptable, but it does not preserve PNG-style transparency.
- Check the downloaded files. After compression, open your downloaded images and confirm that they work for your intended purpose before replacing the originals.
- Use batch processing when convenient. You can upload up to 10 PNG images at once and download the results individually or in a ZIP archive.
Remember: PNG compression does not guarantee that an image will reach a particular target such as 20 KB, 50 KB, or 100 KB. If you need a strict file-size limit for an online form, check the resulting file size before uploading it.
Frequently Asked Questions
Open the iToolsEra PNG Image Compressor, upload your PNG image, select a compression level, and review the estimated result. You can then compress the image and download the optimized file.
PNG uses lossless compression, which preserves the image data rather than discarding image information as lossy compression does. The amount of file-size reduction varies by image, and the compressed result should still be checked for your intended use.
Yes. Lossless PNG compression preserves transparency information. This makes the format suitable for transparent logos, icons, illustrations, and other graphics that need a transparent background.
The tool provides compression levels from 0 to 9, with level 6 selected by default. Different levels change the compression effort, so you can compare estimated results and choose a setting that suits your needs.
Start with the default level 6 and review the estimated file size. If you want to experiment with a smaller output, try another level and compare the result. The highest level is not necessarily the best choice for every image.
Each PNG image can be up to 20 MB. If a file exceeds this limit, you will need to reduce its size or use a smaller source file before uploading it.
Yes. You can upload up to 10 PNG images in one batch. You can also adjust the compression level for individual images when needed.
Yes. The tool provides an estimated compressed file size and potential size change before processing. Treat these figures as estimates rather than a guarantee of the final file size.
Some PNG files are already efficiently compressed or contain data that offers limited scope for further reduction. Results also depend on the image's characteristics, so different files may shrink by different amounts.
The tool lets you adjust compression effort, but it does not guarantee an exact target file size. Check the estimated result and the final downloaded file. If a strict size limit applies, confirm that the output meets it before submitting the image.
PNG is useful for graphics that need transparency or lossless compression. JPG can be a better choice for many photographs when some image information can be discarded to reduce file size. Choose the format based on the image and its intended use.
After processing, you can download the compressed images individually or download them together as a ZIP archive. Open the downloaded files to verify their size and suitability before using them.
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