PNG Compressor

Batch compress PNGs — transparency preserved · palette quantization

Tooltron flying fast
Drop PNG files here
or click to browse — batch upload supported
Transparency Preserved Exactly
Every pixel's alpha channel stays untouched — only the visible RGB colors are quantized, so transparent edges stay clean.
Palette Quantization
A median-cut algorithm reduces each image to its most representative colors, shrinking file size with minimal visible change.
Three Compression Modes
Light for a safe lossless re-encode, Balanced for a 128-color palette, or Maximum for a 64-color palette and the smallest file.
Click-to-Compare Thumbnails
Click any thumbnail to toggle between the original and compressed version and see exactly what changed.
Batch Processing
Upload a whole folder of icons or graphics at once and compress every file in a single pass.
100% Private
Compression runs locally in your browser using the Canvas API — nothing is ever uploaded to a server.

How to Compress a PNG?

  1. 1.Drop your PNGs or click "Drop PNG files here" to upload them.
  2. 2.Pick a Compression Mode — Light, Balanced, or Maximum.
  3. 3.Click "Compress Files" and download each result individually or as a ZIP.
1.8MB
420KB

See Exactly What You're Keeping

Click any thumbnail to flip between the original and the compressed version — transparency stays pixel-perfect at every mode, so you always know what you're downloading before you commit.

Light256 colors
Balanced128 colors
Maximum64 colors
AlphaUntouched

Three Modes, One Click

Light keeps a safe lossless re-encode for photographic PNGs, Balanced applies a 128-color palette, and Maximum drops to 64 colors for the smallest possible file — pick the trade-off that fits your image.

Why Our PNG Compressor Stands Out: Smaller Files, Same Transparency

Built Around PNG's Strengths
Rather than forcing PNGs through a lossy pipeline, Tooltron reduces the color palette while leaving every transparent pixel's alpha value exactly as it was — logos and icons keep their clean edges.
Real Median-Cut Quantization
The compressor analyzes each image's actual color distribution and builds a custom palette from it, rather than applying a generic filter — so results stay accurate to the source image.
A Mode for Every Use Case
Light mode is safe for photographic PNGs, while Balanced and Maximum are built for logos, icons, and flat-color graphics where heavier quantization goes almost unnoticed.
Runs Entirely in Your Browser
All quantization happens on the Canvas API on your own device — batches of icons or graphics never leave your computer, and there's no account or upload limit to worry about.