Using the Web UI

Important

Before you begin, ensure you have installed imgcompress. A local installation is required to run the Web UI.

🚀 Quick Start Guide

Step	Screenshot	Description
1		Upload & Configure Drag & drop images or PDFs. Select your target format (AVIF, JPEG, PNG) and adjust your settings.
2		Real-time Processing Watch the progress as your files are optimized locally. No data ever leaves your computer.
3		Download Results Save your optimized files individually or all at once in a single ZIP archive.

The Web UI provides a powerful, privacy-focused way to compress images without the need for cloud-based tools.

✨ Key Features

Drag & Drop: Easy file management for images and PDFs.
Real-time Feedback: Monitor batch progress with live indicators.
Bulk Processing: Efficiently handle hundreds of images in one go.
ZIP Export: Download all processed images in a organized archive.
Privacy First: All processing happens on your local machine.

📁 Choosing the Right Format

Select the format that best fits your project's needs:

Format	Transparency	Best Use Case
AVIF	✅ Yes	Recommended. Next-gen compression that keeps quality high while drastically reducing file size.
PNG	✅ Yes	Perfect for graphics and logos where pixel-perfect, lossless quality is essential.
JPEG	❌ No	Universal standard for photos where transparency is not required.
ICO	✅ Yes	Specifically designed for web favicons and desktop application icons.

🧠 Instant Background Removal

Requires Transparency Support

To use this feature, ensure your output format is set to AVIF or PNG.

Why use AVIF for Background Removal?

AVIF combines the transparency support of PNG with superior compression. It allows you to remove backgrounds and maintain a tiny footprint without compromising visual quality.

Step	Screenshot	Description
1		Toggle Removal Select AVIF or PNG as the output, then simply flip the Remove Background switch.

Original Image	Background Removed (Local AI)

🎯 Target Specific File Sizes

If you need to meet a strict file size limit (e.g., for web uploads), ImgCompress can automatically calculate the optimal quality for you.

AVIF Support

The Max Output Size slider works for both JPEG and AVIF. Since AVIF compresses more efficiently, you can often achieve higher visual quality within the same size limit.

Step	Screenshot	Description
1		Select Format Choose JPEG or AVIF from the format dropdown.
2		Add Files Drag your images into the interface to begin.
3		Set Limit Navigate to the Set by File Size tab and enter your desired maximum (e.g., 500 KB).
4		Convert Click Start Converting to let the AI find the best balance.
5		Save Once complete, download your perfectly-sized image.

ℹ️ Technical Credits & Background

Processing Engine

All AI-driven tasks are performed locally using rembg and the U²-Net model.
Privacy is guaranteed: No data ever leaves your local network.

Core Libraries

ImgCompress leverages onnxruntime for model execution and Pillow for high-performance image processing.

📸 Image Credits

Landscape with sunset in Yixing (Freepik) used for demonstration.