PNG Compressor Online
Reduce PNG file sizes while preserving transparency and sharp edges. All optimization runs in your browser — no images are uploaded anywhere.
Image Compressor
Compress and resize images in your browser. Adjust quality, change format, and reduce file size — nothing is uploaded to any server.
Drop an image here or click to browse
PNG, JPG, GIF, WebP, BMP — max 20 MB
About Image Compression
This tool compresses images entirely in your browser using the Canvas API. No data is sent to any server — your images stay completely private.
JPEG: Best for photographs. The quality slider controls lossy compression — lower values mean smaller files but more artifacts. 70-85% is typically a good balance.
WebP: Modern format with superior compression. Produces ~25-35% smaller files than JPEG at equivalent quality. Supported by all modern browsers.
PNG: Lossless format — no quality slider. Best for graphics, icons, and images with transparency. File size depends on image complexity, not a quality setting.
Resizing: Set max width and/or height to downscale images. The tool never upscales — if the original is smaller than the specified dimensions, it keeps the original size.
How does PNG compression work?
PNG uses lossless compression (DEFLATE), meaning no pixel data is lost. Optimization reduces file size by choosing better filter strategies, removing unnecessary metadata chunks (like timestamps and text), and reducing the color palette when possible. For images with fewer than 256 colors, converting from truecolor to indexed (PNG-8) can cut file sizes dramatically.
Common use cases
PNG compression is essential for screenshots, UI elements, logos, icons, and any graphic requiring transparency. Web developers optimize PNGs to improve Lighthouse performance scores. Designers compress assets before handing off to development. App developers reduce bundle sizes by optimizing embedded image resources.
Frequently Asked Questions
Is PNG compression lossless?
Standard PNG optimization is lossless — every pixel remains identical. Lossy PNG compression (color palette reduction) can achieve much smaller files with minimal visual difference, especially for images with limited colors.
When should I use PNG instead of JPEG?
Use PNG for images with transparency, sharp text, line art, screenshots, and graphics with flat colors. Use JPEG for photographs and complex images where slight quality loss is acceptable in exchange for much smaller file sizes.