Image Compressor
Compress JPEG, PNG, and WebP images locally via canvas reduction.
Click or drag an image here
Supports JPG, PNG, and WebP formats. Operations run off-thread inside browser workers.
What is this tool?
Compress JPG, PNG, and WebP images directly in your browser using client-side Web Workers and Canvas optimization, featuring single and batch modes, format conversion, and an interactive before/after visual split slider.
How to compress images locally
- Drag and drop an image or click 'Upload Image' to select files from your computer.
- Select single mode for detailed inspection or batch mode to compress multiple photos at once.
- Adjust the quality slider (1-100%) and select an optional target format (WebP, JPEG, PNG).
- Drag the interactive before/after split slider across the image to evaluate visual quality.
- Download the optimized image or download the entire batch packaged as a single ZIP archive.
Key Features
- Multi-threaded on-device compression powered by browser Web Workers
- Interactive before/after visual comparison split slider with zoom preview
- Batch processing mode with concurrent queue execution and ZIP packaging
- Format conversion to modern WebP, JPEG, or PNG formats
- Detailed file size metrics displaying exact byte savings and reduction percentage
Frequently Asked Questions
Are my photos uploaded to an external server or cloud?
No. All compression, canvas rendering, and ZIP archiving take place 100% locally within your browser using Web Workers. Your files never touch a server.
Which image formats are supported?
The compressor supports JPEG, PNG, WebP, and common web image formats with configurable quality and resolution boundaries up to Ultra HD.
Privacy First
All image compression runs on-device using browser Web Workers and Canvas memory. Photos and files are never uploaded to any cloud server.