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.
Online ImageBatch Smart Compression
Supports Specific File Size and Batch Zip Download.
Supports JPG, PNG, WebP, AVIF. 100% Browser-based processing, absolutely secure.
Settings
Recommended. Auto converts PNG to AVIF/WebP, reducing size by 50%-80%.
75%
Min Size Best Quality
Max Dimensions (W/H)
Drag images here, or click to upload
Supports JPG, PNG, WebP, AVIF • Secure Client-side
100% Privacy Safe
Your images never leave your device. All compression happens locally in your browser via WebAssembly. No upload risks.
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.
Frequently Asked Questions
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.
Is it free? Any watermarks?
Image Toolkit is completely free and never adds watermarks.