100% Free Bulk Image Optimizer.
No limits. No caps.
Compress PNG & JPG files right inside your browser. No files are uploaded to any external server—preserving your privacy and speed.
Click to upload or drag and drop images
PNG, JPG, JPEG (automatically target compressed < 1MB each)
How Our In-Browser Image Compressor Works
Most online image compressors send your private photos to remote cloud servers to process and return them. OptiBatch operates entirely inside your web browser using modern client-side technologies such as HTML5 Canvas and Web Workers.
Because files never leave your computer or phone, your photos remain 100% private. This setup also eliminates cloud bandwidth queues, allowing you to optimize batches of images instantly with no daily limits, subscriptions, or file caps.
Supported File Formats
| Format | Best Used For | Compression Method |
|---|---|---|
| JPEG / JPG | Photographs, digital artwork, and complex color palettes. | Lossy (reduces file size while keeping visible sharpness). |
| PNG | Logos, screenshots, graphics requiring transparent layers. | Lossless / Adaptive palette reduction. |
Frequently Asked Questions
Is there a limit on how many images I can compress?
No. Unlike tools that throttle batch sizes or restrict features behind paywalls, OptiBatch is free with no limits. You can process as many images as your browser memory can handle.
Are my images saved on a remote server?
Never. All compression algorithms run locally in your browser memory. When you refresh or close the tab, all processed buffers are immediately deleted.
Why should I compress images below 1MB?
Keeping image sizes under 1MB ensures fast page load times for web visitors, lowers mobile bandwidth usage, and easily complies with attachment limits on email and messaging platforms.