WEBP、JPG、PNG、GIF、BMP形式間で画像をオンラインで無料変換。アップロード不要です。 この無料のオンラインツールは、登録もソフトウェアのインストールも不要です。ブラウザで開くだけですぐに使えます。結果は迅速かつ安全に処理され、すべてのデータはお使いのデバイスで直接処理されます。
画像変換ツール
WEBP、JPG、PNG、GIF、BMP形式間で画像をオンラインで無料変換。アップロード不要です。
画像変換ツールの使い方
Upload Images
Drag and drop or click to select one or more images. Supports PNG, JPG, WEBP, GIF, and BMP.
Choose Format & Settings
Select output format (PNG, JPG, or WEBP). Adjust quality and resize percentage if needed.
Convert Automatically
Images are converted instantly in your browser with a progress indicator for each file.
Download Results
Download each image individually, or use "Download All" to get a ZIP file with all conversions.
いつ使う？
Website Optimization
Convert images to WEBP to reduce file size and improve website loading speed.
Batch Conversion
Process multiple photos at once — ideal for converting iPhone HEIC screenshots or camera exports.
Email & Sharing
Convert PNG to JPG to shrink file size before attaching to emails or social media uploads.
Design Assets
Convert logos or graphics to PNG with transparency support for design projects.
詳細情報
How Image Conversion Works
All conversions happen locally in your browser using HTML5 Canvas. No images are uploaded to any server. Supported formats: PNG (lossless), JPG (adjustable quality), WEBP (modern compression). Resize reduces dimensions proportionally.
よくある質問
A: Yes. You can upload multiple images simultaneously. Each file is converted independently, and you can download them all as a ZIP archive.
A: No. All processing happens entirely in your browser using JavaScript Canvas. Your images never leave your device.
A: Input: PNG, JPG, WEBP, GIF, BMP. Output: PNG, JPG, WEBP.
A: PNG uses lossless compression (no quality loss). JPG and WEBP allow you to adjust quality with the slider. Lower quality = smaller file size.