Pixel colors and transparency are exported without an adjustable lossy quality stage.
Compress PNG
Clean and reduce PNG images locally in your browser.
No upload Batch ready Mobile friendly
Drop files here or pick from your device. Supported: PNG.
Up to 30 files, 100 MB each. 0 files selected
No files selected Images stay in this browser tab while ImgMini works.
Drag the crop box. Use the handle to resize.
- 1SelectChoose or drop your images.
- 2ProcessAdjust the options and run the tool.
- 3DownloadSave the finished files.
Your images stay private.Processing happens locally in this browser. Files are never uploaded or stored.
Continue with ImgMini
Related workflows use the same private browser pipeline.
Optimize PNG files losslessly in the browser
PNG is a lossless format, so it does not expose a photographic quality slider like JPG or WebP. ImgMini runs OxiPNG locally in the browser to optimize the PNG container without reducing visual quality.
Already optimized files may not have more bytes to remove. In that case ImgMini keeps the original and does not offer a larger replacement. For a major reduction, consider WebP when the destination supports it.
A dedicated lossless PNG optimizer runs through WebAssembly in this browser.
A download is only created when the optimized PNG uses fewer bytes.
Choose the smallest format that still meets the image requirements
Keep PNG for transparency, sharp interface graphics, and workflows that require lossless raster output. Use PNG to WebP when broad modern-browser support is enough and reducing bytes is the stronger goal.
Checks before downloading
- Check the reported new size instead of assuming re-encoding reduced the file.
- Keep PNG for assets where exact colors and crisp text matter.
- Compare WebP visually before using it for screenshots or flat graphics.
Questions
Are my images uploaded to ImgMini?
No. ImgMini runs the conversion in your browser. The selected files stay on your device unless you choose to share them elsewhere.
Is PNG compression lossy?
This PNG tool keeps PNG output lossless. If you want lossy compression, use PNG to WebP.