ποΈ Compress Images Online
Free online image compressor: reduce the size of your JPEG, PNG and WebP photos with no visible quality loss. Batch up to 10 images, ZIP download. 100% private.
Drag & drop images here (max 10)
Why compress images?
Image compression is essential for anyone publishing content online. Unoptimized image files can weigh several megabytes, significantly slowing down page load times. Google has used page speed as a ranking factor since 2018, and Core Web Vitals directly measure user experience tied to loading performance.
How does image compression work?
There are two types of compression:
- Lossy compression: reduces file size by removing visual details imperceptible to the human eye. This is how JPEG and WebP work. A quality setting of 75-80% typically offers an excellent trade-off between size and visual quality, achieving 60-80% file size reduction.
- Lossless compression: reduces file size without degrading the image. Used by PNG for graphics, logos and screenshots. The reduction is more modest (10-40%) but the image remains pixel-perfect.
Which format to choose?
| Format | Best for | Compression | Transparency |
|---|---|---|---|
| JPEG | Photos, complex images | Lossy (very efficient) | No |
| PNG | Logos, screenshots, graphics | Lossless | Yes |
| WebP | Web (JPEG/PNG replacement) | Lossy + lossless | Yes |
Tips for optimal compression
- Web photos: use JPEG at 75-80% quality. Files will be 5-10x lighter with no visible difference on screen.
- Images with transparency: keep PNG format but consider resizing the image if it's too large.
- Social media: Instagram, Facebook and Twitter re-compress your uploads automatically. Send pre-optimized files to control final quality.
- Email attachments: compress photos under 1 MB to avoid rejection by mail servers.
Privacy and security
Our compressor works entirely in your browser using the HTML5 Canvas API. Your images never leave your device β no data is sent to any server. This is the safest method to compress sensitive or professional photos. Process up to 10 images simultaneously and download them individually or as a ZIP archive.
Frequently Asked Questions
How do I compress an image online for free?
Drag and drop your image (JPEG, PNG, WebP) into our tool, adjust the quality slider (75% recommended) and download the compressed file. No signup required.
Does compression degrade image quality?
At 75-80% quality, the difference is imperceptible to the naked eye. Only very aggressive compression (below 30%) produces visible artifacts.
What is the maximum file size accepted?
Each file can be up to 50 MB. You can process up to 10 images simultaneously.
Are my images uploaded to a server?
No, all processing happens in your browser via the Canvas API. Your images stay on your device.
How do I compress multiple images at once?
Select up to 10 images at once or drag them together. Adjust quality, then click Download all (ZIP).
Which format offers the best compression?
JPEG and WebP offer the best compression for photographs. PNG is preferred for graphics with transparency but compresses less.