Compress PNG Images Online for Free
Make PNG files smaller in your browser without changing their format, pixel dimensions, or transparent areas.
Select PNG images
or drop images here
PNG files · Up to 100 images · 100 MB each
Images are compressed locally and never uploaded.
- Original
- —
- Compressed
- —
- Saved
- —
Drag the divider to compare. Use 100% to inspect fine details.
Adjust compression
Every image keeps its original format.
Why use this free PNG image compressor?
Free with no sign-up
Compress PNG images and download the results without creating an account, installing desktop software, or paying for a download.
Batch compression for up to 100 images
Add as many as 100 PNG files, let every image compress automatically, then download one result or all completed files in a ZIP archive.
Private browser processing
Image decoding, compression, previews, and ZIP creation all run in your current browser session — no selected file is uploaded to ImageNow.
How it works
- Select or drop up to 100 PNG images into the compressor.
- Compression starts automatically. Adjust the quality and use 100% view to inspect the details.
- Review the actual file-size savings, then download individual results or save all completed files in one ZIP archive.
How PNG compression differs from JPEG
PNG is useful for screenshots, logos, and graphics with sharp edges. Adding a file starts compression automatically while keeping its format, transparency, and dimensions. Compare the result first, then raise Quality if text or gradients need more detail.
Keep transparency and pixel dimensions
The compressed file remains a PNG, with transparent and semi-transparent pixels intact and the same width and height in pixels. It works well for logos, cutouts, overlays, and other graphics that need a transparent background. No background color is added.
When it helps to compress a PNG
Smaller PNG files can help web pages load faster, shorten upload times, and make screenshots or design assets easier to share. Photos saved as PNG are often unnecessarily large, but converting a photo to a more suitable format is a separate task.
Why a PNG may not get much smaller
A PNG that has already been optimized may have little redundant data left, especially if it uses few colors or an efficient palette. When re-encoding does not produce a smaller file, ImageNow returns the original and shows 0% reduction instead of giving you a larger download.
Frequently asked questions
How do I compress a PNG online?
Select or drop your PNG files, wait for automatic compression, compare the sizes, then download each result separately or save all processed files in one ZIP archive.
Will the transparent background be preserved?
Yes. The result stays in PNG format, and transparent or semi-transparent areas remain transparent. The tool does not add a solid background.
Does compressing a PNG reduce image quality?
Lower quality can change gradients and fine details. Compare the result and raise Quality if needed. Format and dimensions are retained; embedded metadata may be removed.
Why is my compressed PNG not much smaller?
The result depends on the image content and any previous optimization. A PNG with an efficient palette or existing compression may already be close to its practical minimum size.
Can I compress multiple PNG images at once?
Yes. Add up to 100 PNG files, let them compress automatically, and download results individually or together in a ZIP archive. Each file can be up to 100 MB.
Are my PNG images uploaded to a server?
No. The selected PNG files are decoded and compressed in your browser. Completed files and the optional ZIP archive are also created on your device.
Can I compress PNG images on Windows, Mac, iPhone, and Android?
The compressor works in modern browsers on Windows, macOS, Linux, iPhone, iPad, and Android. Very large or complex files use more memory and may work better on a desktop device.