Question 1

How does image compression work?

Accepted Answer

Our tool uses the advanced Pica library with Lanczos filtering algorithm to reduce file size while maintaining visual quality. The Lanczos filter is widely regarded as one of the best resampling algorithms, providing superior results compared to standard compression. You can typically achieve 60-70% file size reduction with minimal quality loss, making it perfect for web optimization and storage savings.

Question 2

What image formats are supported?

Accepted Answer

We support JPG (JPEG), PNG, and WEBP formats. All processing happens entirely in your browser using JavaScript - your files are never uploaded to any server. This ensures complete privacy and security for your images while providing fast compression speeds.

Question 3

Is the compression lossless or lossy?

Accepted Answer

The compression can be both lossy and lossless depending on your settings. For JPG and WEBP, quality settings from 1-92% provide lossy compression (smaller files with some quality trade-off). For PNG files, you can select the 100% Lossless preset to compress the file without any quality loss. The 'Balanced' preset at 80% quality is recommended for most use cases, offering the best balance between file size and image quality.

Question 4

Are my images uploaded to a server?

Accepted Answer

No! All image processing happens 100% client-side in your web browser. Your images never leave your device, ensuring complete privacy and security. There is no server upload, no storage of your files, and no data transmission. This also means compression works even without an internet connection after the page loads.

Question 5

What's the difference between the quality presets?

Accepted Answer

We offer four quality presets: 'Maximum' (60%) provides the smallest file size with more noticeable quality reduction, ideal for web thumbnails. 'Balanced' (80%) is our recommended setting, offering 60-70% file size reduction with minimal visible quality loss. 'High' (92%) maintains excellent quality with moderate compression, perfect for professional photos. 'Lossless' (100%, PNG only) compresses without any quality loss, best for graphics and images with text.

Question 6

Can I compress multiple images at once?

Accepted Answer

Yes! We offer a dedicated Batch Compression tool that allows you to compress up to 50 images simultaneously. Click the 'Try Batch Mode' button at the top of this page to access the batch compression feature. All images are still processed client-side in your browser, maintaining the same privacy and security as single image compression.

Question 7

What's the maximum file size I can compress?

Accepted Answer

You can compress images up to 50MB in size. For files larger than 10MB, you'll see a warning as processing may take longer depending on your device's capabilities. If you're compressing very large images, consider using a lower quality setting to reduce processing time.

Question 8

Will compression affect image dimensions?

Accepted Answer

No, compression only reduces the file size without changing the image dimensions (width and height). The pixel dimensions remain exactly the same. If you want to resize your image along with compression, use our Resize Image tool first, then compress the result.

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