Drag & drop image here
Supports JPG, PNG, WEBPPrivacy Secured: This utility runs 100% inside your browser. No files, logs, or values are uploaded to any server. Your information stays safe on your device.
About Image Compressor
The Image Compressor is a powerful interactive tool designed to minimize the storage size of JPEG, PNG, and WEBP images. Heavy image files slow down websites, consume bandwidth, and impact storage limits. Our compressor lets you customize the compression ratio dynamically using a quality slider. You can compare original vs. compressed file sizes in real-time and inspect visual changes before downloading. Best of all, everything happens locally on your device, ensuring your photos are never seen by third parties.
How it Works
Simply drop your image file into the compressor. The application reads the file size and loads the image into a canvas. An interactive slider lets you set the compression quality (10% to 100%). The tool re-compresses the image using the canvas.toDataURL("image/jpeg", quality) method, estimates the new byte size, and updates the compression savings metric instantly. Once satisfied, click download to save the optimized file.
Key Features
- Quality Slider: Custom control over the compression ratio.
- Real-Time Size Comparison: Instantly see file size and percentage saved.
- Multi-Format Support: Compress JPEG, PNG, and WEBP files.
- 🔒 Secure & Private: Images are processed locally and never sent to servers.
Technical Details
The compressor utilizes the HTML5 Canvas 2D rendering context. For JPG and WEBP compression, the canvas.toDataURL(type, quality) method accepts a quality parameter between 0.0 and 1.0. The script translates the output base64 data stream to calculate the size in bytes (multiplying the base64 length by 0.75) to provide real-time feedback without file system read delays.