Image to JPEG

JPEG (Joint Photographic Experts Group) is a lossy compressed image format, especially suitable for storing photographs. It reduces file size by removing image information that is less noticeable to the human eye, achieving high compression rates while maintaining visual quality. JPEG supports 16.77 million colors and is one of the most commonly used image formats on the web. This tool uses the browser's built-in encoder to ensure conversion speed and privacy security.

JPEG is best suited for: 1) Photographs and real-life scene images; 2) Web images requiring smaller file sizes; 3) Images without the need for transparent backgrounds; 4) Complex images with rich colors. Not suitable for: line drawings, text screenshots, icons requiring transparency, etc. Since this tool processes locally, you can safely convert private photos.

• 90-100%: Highest quality, suitable for professional photography and printing • 80-90%: High quality, suitable for most web displays • 70-80%: Standard quality, smaller files, suitable for general web use • 60-70%: Acceptable quality, suitable for thumbnails • Below 60%: Only suitable for previews or scenarios requiring extreme compression Tip: You can preview the effects of different quality settings in real-time to find the best balance between quality and size.

When using batch conversion: 1) It's recommended to test the quality settings on a single image first; 2) Use the same settings for similar types of images; 3) Pay attention to the file size after conversion; 4) Browsers may limit the number of simultaneous processes, so it's advisable to process large numbers of images in batches; 5) Use the filename template feature to keep files organized. All processing is done on your device, so there's no need to worry about network speed.

Since processing is done in the browser: • Large images (>10MB) may process slowly • It's recommended to close other tabs to free up memory • Chrome/Edge usually offer the best performance • Avoid switching tabs during batch processing • If experiencing lag, try reducing the number of images processed simultaneously • Mobile devices are recommended to process one image at a time

Q: Why does the image quality decrease after conversion? A: JPEG is a lossy compression format; it's recommended to increase the quality setting to above 85%. Q: Can transparent backgrounds be preserved? A: JPEG does not support transparency; transparent areas will become white. Use PNG if transparency is needed. Q: Is there a file size limit? A: There's theoretically no limit, but it's constrained by device memory. It's recommended not to exceed 50MB per image. Q: Will my images be uploaded? A: No, all processing is done in your browser, and we cannot access your images.