D2D Utilities
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Image Converter, Compressor & Resizer

Canvas Engine

Convert formats (PNG, JPEG, WebP), resize dimensions with aspect ratio lock, and adjust compression quality client-side via HTML5 Canvas. Zero uploads to any server.

Client-Side Canvas: Image pixels are drawn and re-encoded locally in browser memory
Target Output Format
Dimensions (Pixels)
85%
Higher quality results in larger file sizes. JPEG and WebP benefit most from lossy compression.
Load a sample image or upload a file to preview and convert

Zero-Server Image Compression & Conversion

Images are drawn into an offscreen HTML5 2D canvas context and exported using native browser encoder APIs (`toDataURL`). Your original full-resolution files never travel over the network.

画像を変換・圧縮する方法

  1. 1画像を読み込み、目標の形式とサイズを指定します。
  2. 2画質スライダーで容量を調整し保存します。

Frequently Asked Questions

画質劣化は防げますか?

リアルタイムで画質とファイルサイズを確認しながら調整できます。