ConvertorLab
Lossless or smallerTransparency keptBatch + ZIP

Compress PNG Online

Make PNG files smaller while keeping sharp edges and transparent backgrounds. Choose lossless, reduce colors for a much lighter file, or set an exact KB target. Free, no sign-up, and images stay on your device.

Import and settings

Add PNG files, choose how much detail to keep, then optimize the batch.

Drag & drop PNG files here or

Supported: PNG. Limits: 200 files - 1 GB total.

85%

Use lossless PNG for logos, screenshots, and transparent artwork. Use smaller PNG or WebP only after checking the preview.

Compression complete. Download individual files or save the full ZIP.

Images and downloads

The ZIP download unlocks after compression finishes.

No PNG images selected yet. Add images from the import panel. Large batches will scroll here without stretching the page.

Compress PNG without losing quality

PNG files are big because they store every pixel exactly. That is great for logos, screenshots and graphics with transparent backgrounds, and wasteful for everything else. This compressor offers two ways to shrink them.

Lossless PNG re-packs the file with better compression. Every pixel stays identical, transparency included. The saving is usually modest, since many PNGs are already packed well.

Smaller PNG reduces the number of colors (a method called color quantization). A screenshot or flat logo rarely uses more than a few hundred colors, so dropping to 256 or 128 colors can cut the file by half or more while looking the same. The Color detail slider controls how far it goes.

How to compress a PNG file

  1. Add PNG images. Drag them in or tap Choose Images.
  2. Choose a mode. Lossless for exact copies, Smaller PNG for real savings, or set a Target size in KB.
  3. Start compression and wait for each card to show its new size.
  4. Check the edges. Zoom into gradients and anti-aliased text with the slider, then download the PNG or the ZIP.

Which mode is right for your image?

Logo, icon, UI screenshotSmaller PNG at 256 colors. Big saving, no visible change.
Graphic with soft gradientsLossless, or Smaller PNG with Color detail at 90% or higher.
Photo saved as PNGPNG is the wrong format for photos. Convert it with PNG to JPG or PNG to WebP instead.
Must stay under a size limitTarget size. Colors are reduced first, then dimensions if needed. Transparency is kept.

Does it keep the transparent background?

Yes. Both PNG modes and the target size option keep the alpha channel, so a logo with a transparent background stays transparent. Only the Ultra tiny WebP mode changes the format; WebP also supports transparency, but some older software can't open it.

Free PNG compressor that runs on your device

Images are processed in your browser, not on a server. There's no upload, no account and no watermark, and you can compress up to 200 PNG files per batch.

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PNG compression questions

How do I compress a PNG without losing quality?

Choose the Lossless PNG mode. It re-packs the file without changing a single pixel. For a much bigger saving with no visible change on logos and screenshots, use Smaller PNG with Color detail at 85% or above.

Why is my PNG file so large?

PNG stores every pixel without loss, which makes photos and large screenshots heavy. If the image is a photo, converting it to JPG or WebP will shrink it far more than PNG compression can.

Can I compress a PNG to 100KB or 50KB?

Yes. Set Target size to 100 KB, 50 KB or a custom value. The tool reduces colors first and then the pixel dimensions until the file fits, while keeping transparency.

Does PNG compression keep transparency?

Yes. The alpha channel is preserved in every PNG mode.

What does the Color detail slider do?

In Smaller PNG mode it sets how many colors the image keeps. Lower values give smaller files but can add banding to smooth gradients.

Is this PNG compressor free and private?

Yes. It's free with no sign-up, and the images are compressed in your browser without being uploaded.