What is image resolution?
Image resolution refers to the number of pixels in an image, typically expressed as width × height (e.g., 1920×1080). Higher resolution means more detail but larger file sizes.
What are pixels?
Pixels are the smallest individual elements of a digital image. Each pixel contains color information and together they form the complete image.
What is aspect ratio?
Aspect ratio is the proportional relationship between an image's width and height (e.g., 16:9, 4:3). It's important for maintaining proper image display across different devices.
What is image compression?
Image compression is the process of reducing an image's file size while trying to maintain visual quality. It works by removing redundant data and optimizing the image's data structure.
What's the difference between lossy and lossless compression?
Lossless compression preserves all original data while reducing file size. Lossy compression achieves smaller file sizes by permanently removing some data, potentially affecting image quality.
How does JPEG compression work?
JPEG compression works by dividing the image into small blocks and applying mathematical transformations to reduce color and brightness information while preserving visual appearance.
What's the optimal compression quality setting?
Our default 60% quality setting provides a good balance between file size and visual quality for most images. Higher settings maintain better quality but result in larger files.
How much can I compress without losing quality?
The amount of compression depends on the image content. Photos can often be compressed 50-80% with minimal visible quality loss, while text or graphics may require higher quality settings.
Why do some images compress better than others?
Images with large areas of similar colors or patterns compress better than those with lots of detail or sharp transitions. Complex images require more data to maintain quality.
When should I use JPEG?
JPEG is best for photographs and complex images with many colors. It's ideal for web photos where some quality loss is acceptable for smaller file sizes.
When should I use PNG?
PNG is best for images with text, lines, or sharp edges, and when transparency is needed. It provides lossless compression but results in larger files than JPEG.
What is WebP?
WebP is a modern format that provides both lossy and lossless compression with smaller file sizes than JPEG and PNG. It's increasingly supported by modern browsers.
What's the recommended maximum image size for web?
For web use, images should typically be no larger than 1-2MB. Our website automatically limits dimensions to 1200 pixels while maintaining aspect ratio.
How can I optimize images for SEO?
Use descriptive file names, add alt text, compress images appropriately, and ensure fast loading times. Our website helps with the compression aspect.
Should I compress images before uploading to social media?
Most social media platforms compress uploaded images automatically. However, pre-compressing can give you more control over the final quality.
Is my data safe when using this website?
Yes, our website processes everything locally in your browser. Your images never leave your device or get uploaded to any servers.
Can I use this website offline?
Yes! Once loaded, our website works completely offline. You can disconnect from the internet and continue using it.
Are my images stored anywhere?
No, we don't store any images. All processing happens in your browser's memory and is cleared when you close the page.
Why isn't my image compressing as much as expected?
Some images may already be optimized or may contain content that doesn't compress well. Try adjusting the quality slider for better results.
What should I do if the compression preview isn't loading?
Try refreshing the page or using a different browser. Ensure your browser is up to date and JavaScript is enabled.
Why did my image dimensions change after compression?
Our website automatically resizes very large images to a maximum of 1200 pixels while maintaining aspect ratio. This helps optimize for web use.