Compress PNG Images Online

Upload a PNG and shrink its size instantly — choose lossless optimization, target file size, or convert to JPEG for more aggressive compression. Works 100% in your browser.

Drag & Drop your PNG here

or click below to browse

Optional - specify desired file size
Used only for PNG → JPEG conversion. Value: 85%
Strip metadata & re-encode PNG

Converting to JPEG gives much smaller files but removes transparency. Best for photos.

Preview & Size Comparison

Original PNG

Original
Size: - Type: PNG

Compressed Result

Compressed
Size: - Reduction: 0% PNG
Download

Complete Guide to PNG Compression Online

What This PNG Compression Tool Does

Our Free PNG Compression Tool reduces PNG file sizes through multiple optimization strategies while maintaining visual quality. PNG files often contain unnecessary metadata, excessive color depth, and inefficient compression settings that increase file size. This intelligent compressor analyzes your image and applies appropriate techniques: lossless re-encoding, metadata stripping, color palette optimization, and optional JPEG conversion. All processing happens locally in your browser with zero data upload to external servers.

Understanding PNG Compression Methods

The tool offers three compression approaches: Lossless Optimization re-encodes PNG data with optimal compression settings, removes metadata, and can reduce size by 5-60% without any quality loss. Target Size Compression lets you specify desired file size, automatically adjusting compression to meet your goal. PNG to JPEG Conversion transforms PNG to JPEG format, achieving much smaller files (70-90% reduction) but losing transparency and some quality. Each method serves different needs depending on your image content and use case.

Technical Process of PNG Optimization

When compressing a PNG, the tool analyzes the image's color profile, transparency data, and compression efficiency. For lossless optimization, it reprocesses the PNG using optimal DEFLATE compression settings, removes unnecessary metadata (EXIF, text chunks, timestamps), and optimizes color palettes for indexed images. The algorithm detects whether an image uses truecolor (16 million colors) or indexed color (256 colors) and applies appropriate optimization strategies. Advanced techniques include filter selection optimization and interlace removal.

When to Use PNG vs JPEG Compression

Use PNG compression for images requiring transparency (logos, icons, graphics), images with text or sharp edges (screenshots, diagrams), images with limited colors (graphics, illustrations), and images needing lossless quality (archival purposes). Use PNG to JPEG conversion for photographs, natural images with gradients, images without transparency needs, and when maximum file size reduction is more important than perfect quality. JPEG typically achieves 70-90% size reduction compared to PNG's 5-60% lossless reduction.

Privacy and Security Guarantee

Your images remain 100% private because all compression occurs within your browser using JavaScript. No PNG files are uploaded to external servers - the entire optimization pipeline runs locally on your device. This means personal photos, confidential screenshots, proprietary graphics, or sensitive documents never leave your computer. Temporary data is automatically cleared after processing, and no tracking cookies monitor your compression activity.

Optimization Settings Guide

Lossless Optimization: Always enabled by default - provides free size reduction with zero quality loss. Target Size: Useful when you have specific file size requirements (e.g., email attachments under 1MB). JPEG Quality: 85-95% for high quality, 70-85% for web use, 50-70% for maximum compression. PNG to JPEG Conversion: Enable when transparency isn't needed and maximum size reduction is required. For graphics with solid colors, stick with PNG. For photographs, consider JPEG conversion.

Frequently Asked Questions

Yes, completely. Lossless PNG optimization preserves 100% of image quality, transparency (alpha channel), and color accuracy. The compression works by removing unnecessary metadata, optimizing compression settings, and re-encoding the image data more efficiently without altering pixel values. Transparency channels remain intact, making it perfect for logos, icons, and graphics requiring transparent backgrounds. Quality reduction is zero - the optimized image is visually identical to the original.

100% secure and private. All compression happens locally in your browser - no images are uploaded to any server. Your PNG file is loaded into browser memory, processed using JavaScript libraries, and the compressed version is generated entirely on your device. This means personal photos, confidential screenshots, proprietary graphics, or sensitive images never leave your computer. No data is stored, transmitted, or accessible to anyone else.

Reduction depends on image type: Screenshots/graphics often reduce 40-70% with lossless optimization. Photographs saved as PNG may only reduce 5-20% losslessly (consider JPEG conversion instead). Indexed color images (256 colors or less) can reduce 50-80%. PNG to JPEG conversion typically achieves 70-90% reduction. The tool shows exact before/after sizes and percentage reduction. Unoptimized PNGs from graphic software see the biggest reductions.

PNG uses lossless compression - perfect quality preservation but larger files. It supports transparency and is ideal for graphics, text, and images requiring sharp edges. JPEG uses lossy compression - smaller files but some quality loss. It doesn't support transparency and is best for photographs and natural images. PNG compression reduces file size by optimizing encoding, while JPEG compression discards some image data imperceptible to human vision. Choose PNG for graphics/screenshots, JPEG for photos.

No, dimensions remain unchanged and color depth is preserved. The compressor reduces file size through data optimization, not by resizing or reducing color information. Your compressed image will have exactly the same width, height, pixel count, and color depth (24-bit RGB, 32-bit RGBA, 8-bit indexed, etc.) as the original. Only the compression efficiency changes, not the image specifications. This ensures your images maintain their intended display characteristics.

Currently, animated PNG (APNG) files are not supported. This tool is optimized for standard PNG images (single frames). APNG files contain multiple frames and require specialized compression techniques. For APNG files, we recommend using dedicated APNG optimization tools or converting to GIF/MP4 if animation isn't essential. Regular PNG files with transparency work perfectly, but multi-frame animations may not compress correctly or may lose animation data.

Convert PNG to JPEG when: Transparency isn't needed (JPEG doesn't support it), Image is a photograph (JPEG handles gradients better), Maximum size reduction required (JPEG achieves 70-90% vs PNG's 5-60%), Image has many colors/gradients (JPEG compresses these efficiently), or For web use where load time matters (smaller files load faster). Keep as PNG when: Transparency is required, Image has text/sharp edges, Image has limited colors, or Lossless quality is essential.

Practical limits depend on your device's memory. Most modern browsers can handle PNG files up to 50-100 MB without issues. However, very large files may cause browser slowdowns or memory errors. For optimal performance, we recommend compressing PNGs under 20MB. If you experience performance issues, try compressing smaller batches or using desktop software for extremely large images. The tool provides feedback if a file is too large to process efficiently.

Other Tools

🖼️

BMP to JPG Converter

Convert BMP images to JPG format quickly and easily.
📦

Compress PNG

Reduce PNG image size while maintaining high visual quality.
📊

Barcode Generator

Create and download barcodes instantly for free.
🔎

Barcode Scanner

Scan and decode barcodes directly from your camera or uploaded images.
🔄

WEBP to GIF Converter

Turn animated or static WebP files into shareable GIFs online.
📄

PDF to Image Converter

Convert PDF pages into high-quality JPG or PNG images instantly.
Fast Conversion

Upload and convert files instantly with our optimized tools.

Secure & Private

Your files are encrypted and automatically deleted after processing.

Works Everywhere

Access our converter on any device, anytime, anywhere.