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.

Drag & drop an image, or click to select

Supported: JPEG, PNG, WebP, GIF, BMP

Max 50 MB

📖How to Use
  • 1Upload or drag & drop an image file (JPEG, PNG, WebP, GIF supported)
  • 2Enter output dimensions in pixels or percent. Check "Keep aspect ratio" to prevent distortion
  • 3Select output format (JPEG, PNG, WebP) and set compression quality (0–100)
  • 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%

❓Frequently Asked Questions

Q.Are images uploaded to a server?
A. No. All processing happens in your browser via JavaScript. Your images never leave your device, making it safe for confidential photos.
Q.What formats are supported?
A. JPEG, PNG, WebP, and GIF are supported. For HEIC files (iPhone photos), please use the HEIC Converter tool.
Q.How much can I compress an image?
A. Results vary by image content, but JPEG at 80% quality typically reduces file size by 50–70%. Converting to WebP format can reduce it even further.
Q.Can I process multiple images at once?
A. Yes, drag and drop multiple images to process them in batch.

👉 Next Steps

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