1How to use this tool
Easily optimize your photos and illustrations locally within your browser:
- Drag and drop your image file into the dashed uploader zone, or click the box to browse your device.
- Adjust the Compression Quality slider (default 80%) to balance clarity vs file size.
- Set the Resolution Scale slider if you also wish to resize the physical dimensions of the image.
- Optionally select an export format (e.g. converting PNG screenshots to highly compressed WebP files).
- Review original vs compressed file size calculations and saving percentages.
- Click Download Compressed Image to save the optimized file.
2Benefits and Use Cases
- Format Transcoding: Instantly convert heavy PNG files to optimized WebP or JPEG formats to increase loading speeds.
- Debounced Live Preview: View exact compression size estimates in real-time as you tweak sliders.
- High Resolution Control: Scale image geometry dimensions dynamically to fit web layout restrictions.
- 100% Client-Side Privacy: Images are drawn on an in-memory browser canvas and never uploaded to any remote server.
Frequently Asked Questions
Does my image upload to a server during compression?
No. Our compressor operates 100% locally in your web browser. Files are drawn on an HTML5 canvas element and compressed directly inside your browser memory using WebGL and client scripts. Your images are never sent to a remote server, ensuring total privacy.
What is the difference between PNG, JPEG, and WebP compression?
PNG uses lossless compression, making it ideal for screenshots and logos with transparent backgrounds. JPEG uses lossy compression, which is perfect for photographs where small details can be discarded to reduce size. WebP is a modern next-gen format that provides both lossy and lossless modes, yielding significantly smaller file sizes at high visual clarity.
How does changing the quality affect the output file size?
Lowering the quality increases the compression ratio by discarding high-frequency color details. Stripping these details decreases file size exponentially. A quality rate between 70% and 80% usually offers the best balance of dramatic file size savings and virtually invisible visual degradation.