100% Privacy Safe
Your images never leave your device. All compression happens locally in your browser via WebAssembly. No upload risks.
Settings
Recommended. Auto converts PNG to AVIF/WebP, reducing size by 50%-80%.
Compression Target
Strength 75%
Min Size Best Quality
Max Dimensions (W/H)
Output Format
Drag images here, or click to upload
Supports JPG, PNG, WebP, AVIF • Secure Client-side
Image Toolkit
Online Image Batch Smart Compression
Supports Specific File Size and Batch Zip Download.
Supports JPG, PNG, WebP, AVIF. 100% Browser-based processing, absolutely secure.
Professional browser-based image compressor. Supports JPG, PNG, WebP, AVIF. Features: Compress to specific KB size, unlimited batch processing, one-click zip download. 100% privacy safe.
Browser image compression workflow
- Use quality mode for general optimization across JPG, PNG, WebP, and AVIF.
- Switch to target size mode when upload forms require a maximum file size.
- Batch compress files and download all results as a ZIP archive.
Specific Target Size
Precise control. Enter your desired KB size (e.g., 50KB), and the algorithm automatically adjusts quality to match.
Batch Processing
Drag and drop dozens of images at once. Once processed, download all images as a single ZIP archive.
AVIF / WebP
Export next-gen formats. AVIF reduces size by 50%-80% compared to JPG at the same quality.
Support
Frequently Asked Questions
01 How to compress to a specific size (e.g., 50KB)? +
In the settings panel, switch to "Target Size" mode, then enter your desired value (e.g., 50). The tool uses binary search to find the best quality that fits your size.
02 Is batch compression supported? Any limits? +
Fully supported. You can drag dozens of images at once. There are no artificial limits (only depends on your device memory). Use the Download ZIP button to save them all.
03 Is it free? Any watermarks? +
Image Toolkit is completely free and never adds watermarks.