压缩器 v1.0

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  • JPG
  • PNG
  • WebP
  • AVIF
  • GIF
  • SVG
  • HEIC

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Compression

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Compress PNG images online.

PNG is the go-to format for images that need sharp edges, transparency, and lossless quality — screenshots, logos, icons, text overlays, and graphics with flat colour areas. Our compressor gives you both lossless and lossy (quantization) modes.

Lossless PNG compression typically saves 10-40% by optimizing filter strategies and deflate parameters. For PNG photographs and complex images, lossy quantization can reduce file size by 60-80% with minimal visible difference.

Key features

  • Lossless mode preserves every pixel identically
  • Lossy quantization mode for dramatic size reductions
  • Full alpha channel and transparency preservation
  • Parallel batch processing — unlimited files
  • Metadata stripping for smaller files

How to compress png — step by step

  1. Drop your PNG: Drag and drop one or more PNG images onto the upload area, or click to browse your files.
  2. Choose compression mode: Select lossless mode to preserve every pixel, or lossy mode with colour quantization for dramatic size reductions.
  3. Preview and compare: Use the side-by-side comparison slider to verify that transparency and details are intact.
  4. Download your compressed PNG: Save individual files or download all images as a ZIP archive. Your originals are never uploaded.

Common use cases

Whether you are a photographer, web developer, e-commerce manager, or social media creator, optimizing images before publishing saves bandwidth, improves page load times, and ensures compatibility with platform-specific requirements. Our browser-based compressor works with all major image formats and processes everything locally for your browser with no uploads.

Need to convert images between formats? Try our Image Converter. To resize images for any platform, use the Image Resizer. For rotation and flipping, check the Image Rotator. To crop images with preset aspect ratios, use the Image Cropper.

Compress PNG

Frequently Asked Questions

  • Can you compress a PNG without losing quality?

    Yes. PNG supports lossless compression, which reduces file size without changing a single pixel. Our compressor uses optimized filter strategies and deflate compression to shrink lossless PNGs by 10-40% with identical output.

  • Does PNG compression preserve transparency?

    Absolutely. The alpha channel, gamma correction, and color profiles are all preserved during compression. Your transparent PNGs stay transparent with the exact same pixel values.

  • What is the difference between lossy and lossless PNG compression?

    Lossless PNG compression re-encodes the image data more efficiently without changing any pixels. Lossy PNG compression (quantization) reduces the number of distinct colours, which can dramatically shrink file size at the cost of some precision.

  • When should I use PNG instead of JPEG?

    PNG is best for images with sharp edges, text, logos, screenshots, and graphics with transparency. JPEG excels at photographs and gradients.

  • Can I batch compress PNG files?

    Yes. Drop a folder of PNGs and the queue processes them in parallel. No hard limit on quantity — compress as many PNGs as you need, with no individual size limit beyond your device memory.