The image merger supports JPG, PNG, GIF, and WebP formats. You can mix different formats in the same merge operation - for example, combining PNG logos with JPG photos. The tool automatically handles format conversion and maintains quality during the merging process.

You can merge between 2 and 20 images in a single operation. The combined file size of all images must not exceed the size limit. For best results and manageable output sizes, we recommend merging 2-10 images at a time, especially for high-resolution images.

Horizontal layout places images side by side in a row. Vertical layout stacks images in a column. Grid layout automatically arranges images in a balanced grid formation, perfect for creating collages or photo grids. Choose based on your intended display or design needs.

Yes! You can set custom spacing from 0-100 pixels between images. Zero spacing creates seamless connections, while larger values provide clear separation. The spacing is applied uniformly between all images in the chosen layout for consistent visual appearance.

The background color fills any empty canvas space around or between your images. For PNG output, you can achieve transparent backgrounds by selecting PNG format and using transparency options. The background is especially visible when images have different sizes or when spacing is applied.

The tool handles different image sizes intelligently. With alignment enabled, images are centered within their allocated space. Without alignment, the canvas size adjusts to accommodate all images at their original sizes. The final output maintains all original image proportions.

Choose PNG for highest quality and transparency support, ideal for graphics and images with transparency. Use JPG for smaller file sizes when merging photos without transparency needs. WebP offers the best compression efficiency for modern web applications. Consider your intended use and compatibility requirements.