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PNG Compressor

PNG画像を無料でオンライン圧縮 - Pic Compress

PNG画像を無料でオンライン圧縮。画質または目標サイズを選び、ファイルはブラウザ内で安全に処理します。透明部分を保ちながら容量を削減します。

画像をここにドロップ

ファイルを選択

対応形式：JPG、PNG、WebP、GIF、SVG、AVIF、ICO、HEIF、HEIC、TIFF、BMP、RAW、BMP

最大ファイルサイズ：50MB

圧縮設定

品質

目標サイズ

出力形式

EXIFメタデータを保持

ロスレス圧縮

PNG圧縮について

無料でオンラインPNG画像を圧縮します。私たちのPNG圧縮ツールは高度なアルゴリズムを使用して、画像品質を維持しながらファイルサイズを削減します。Web最適化、メール添付、ソーシャルメディアのアップロードに最適です。

What is PNG?

PNG (Portable Network Graphics) is a raster image format that supports lossless compression and transparency. Unlike JPG, PNG preserves all image data during compression, making it perfect for graphics, logos, icons, and images requiring transparent backgrounds. PNG-24 supports millions of colors while PNG-8 is optimized for simpler graphics.

Why Compress PNG Images?

Compressing PNG images offers numerous benefits for both website owners and users. Large image files slow down page loading times, increase bandwidth costs, and provide a poor user experience. By optimizing your PNG images, you can significantly improve website performance, reduce storage requirements, and enhance user engagement.

Faster website loading times and improved Core Web Vitals scores
Better SEO rankings as Google considers page speed as a ranking factor
Reduced bandwidth costs and server storage requirements
Improved user experience with quicker page interactions
Better mobile performance on slower network connections
Faster email attachment delivery and social media uploads

How to Compress PNG Images Online

1Upload your {format} image files by dragging and dropping them into the upload area, or click to browse and select files from your device.
2Adjust compression settings including quality level, target file size, and output format according to your specific needs.
3Click the compress button to process your images. Our advanced compression algorithms work entirely in your browser.
4Preview the compressed images and compare them with the originals to ensure the quality meets your requirements.
5Download individual compressed files or download all images as a ZIP archive for convenient batch processing.

Best Practices for PNG Optimization

To achieve the best results when compressing PNG images, consider these professional tips and recommendations:

Choose the right quality setting: 70-85% for web use, 90-100% for printing, 50-70% for thumbnails
Set appropriate target sizes based on your use case (e.g., 100-200KB for web, 50KB for email)
Use lossless compression when image quality is critical (logos, medical images, archival)
Resize images to their maximum display dimensions before compression
Test compressed images on multiple devices to ensure acceptable quality
Keep original files as backups before applying aggressive compression
Consider converting to modern formats like WebP or AVIF for better compression ratios

Common Use Cases for PNG Compression

Website Optimization

Reduce page load times and improve Core Web Vitals scores by optimizing all {format} images on your website.

E-commerce Product Images

Optimize product photos for faster browsing while maintaining visual quality that drives conversions.

Social Media Posts

Compress images to meet platform requirements for Instagram, Facebook, Twitter, and LinkedIn uploads.

Email Marketing

Reduce image file sizes for faster email loading and better engagement rates in email campaigns.

Blog and Content Creation

Optimize featured images and inline graphics for faster blog loading and better reader experience.

Portfolio and Photography

Compress high-resolution photos for online portfolios while preserving visual quality and detail.

Technical Details About PNG Compression

Our PNG compression tool uses advanced browser-based technologies to process images locally on your device. Unlike online converters that upload your files to remote servers, our tool performs all compression operations directly in your browser using modern web APIs.

Client-side processing: All images are processed locally, ensuring complete privacy and security
Advanced compression algorithms: Optimized for {format} format characteristics
Batch processing: Compress up to 20 images simultaneously for efficient workflow
Real-time preview: Compare original and compressed images before downloading
Customizable settings: Fine-tune quality, target size, and output format
No file size limits: Process images up to 50MB each without restrictions

Popular use cases

パスポート・ビザ写真 WebサイトとSEO Instagram LinkedIn メール添付 WhatsApp Discord X（Twitter）

よくある質問 - Pic Compress

PNG圧縮とは何ですか？

PNG圧縮は、透明度と許容できる視覚品質を維持しながらPNG画像のファイルサイズを削減します。

PNG画像を圧縮する方法は？

PNGファイルをアップロード領域にドラッグ＆ドロップし、圧縮設定（品質、目標サイズ）を調整して、圧縮ボタンをクリックします。

PNG圧縮で画質は低下しますか？

PNGは無損圧縮をサポートしており、ファイルサイズを削減しながら元の品質を維持できます。

PNGの最適な品質設定は？

Web用途には70-85%の品質が適しています。印刷には90-100%を使用してください。

データは安全ですか？

ファイルは完全に安全です。すべての圧縮はブラウザ内でローカルに行われます。

モバイルデバイスで圧縮できますか？

はい！すべての最新ブラウザで動作します。

非可逆圧縮と可逆圧縮の違いは？

非可逆圧縮は一部の画像データを削除してファイルサイズを削減します。

Can I compress images in batch?

Yes! You can upload and compress up to 20 images simultaneously. Our tool processes all images in parallel for maximum efficiency.

What browsers are supported?

Our tool works on all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. We recommend using the latest browser version for best performance.

Do I need to install any software?

No installation required. Our tool runs entirely in your browser. Simply visit the website and start compressing images immediately.

Can I compress images on my phone or tablet?

Yes! Our tool is fully responsive and works on smartphones, tablets, and desktop computers. The interface adapts to your screen size.

What should I do if compression fails?

If compression fails, try refreshing the page and uploading the image again. Ensure your browser is up to date and the file is not corrupted.

Can I convert between image formats?

Yes! Our tool allows you to convert images between different formats during compression. For example, you can convert PNG to JPG or WebP.

How do I choose the right target file size?

Choose target size based on your use case: 10-50KB for thumbnails and icons, 50-100KB for email attachments, 100-200KB for web images, 200-500KB for high-quality photos.

Is there a limit on how many images I can compress?

There is no daily limit on the number of images you can compress. You can process up to 20 images per batch, and you can run as many batches as needed.

Do you store my images after compression?

No. All processing happens locally in your browser. We never store, upload, or access your images. Your files remain completely private.

Can I use compressed images for commercial purposes?

Yes! You can use compressed images for any purpose, including commercial projects. Our tool is free to use without restrictions.

Why is my compressed image larger than expected?

This can happen with very small images or images with simple content. In these cases, the compression overhead may result in minimal size reduction.

How can I get the best compression results?

For best results: resize images before compression, choose appropriate quality settings (70-85% for web), use target size feature for specific requirements, and consider converting to WebP or AVIF formats.

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