CCalcBOX
🌐JA
🖼️

Image Resizer & Compressor

Free browser-based image compression and batch resizing. Supports JPEG, PNG, and WebP. No server upload — fully private.

Images are processed in your browser. Nothing is uploaded to a server.

Drag & drop an image here, or click to select

Supported: JPEG, PNG, WebP, GIF, BMP, SVG

Max file size: 50 MB

📖How to Use
  1. 1Upload or drag & drop an image file (JPEG, PNG, WebP, GIF supported)
  2. 2Enter output dimensions in pixels or percent. Check "Keep aspect ratio" to prevent distortion
  3. 3Select output format (JPEG, PNG, WebP) and set compression quality (0–100)
  4. 4Click "Convert" and download. Everything runs in your browser — no uploads
💡Tips & Knowledge
  • •WebP format is 25–30% smaller than JPEG and supported by all modern browsers — ideal for web use
  • •Quality 70–80% is recommended for batch photo compression: minimal visible difference, major size savings
  • •Common social media sizes: Twitter icon 400×400px, Instagram post 1080×1080px, YouTube thumbnail 1280×720px
  • •To minimize file size, use JPEG format at quality 60–75%

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All calculations run in your browser. No data is sent to any server.