How to Combine Images Into a Grid Collage

What Image Collage does

Image Collage turns multiple Base64-encoded images into a grid collage. It is useful when you need to arrange several image files in one image while controlling the number of columns, the background color, and the spacing around the collage cells.

For a successful result, provide at least two images. The tool processes no more than the first nine supplied images, so a larger collection will not all appear in the same collage. Each image must be supplied as Base64 image data that can be decoded and opened as an image.

How to create a grid collage

1. Prepare at least two Base64-encoded images. Check that each value represents image data and can be opened as an image. If you provide more than nine images, place the images you want included first because only the first nine are processed.

2. Add the image values to the image collection. Although the declared input contract marks that collection as optional, a successful collage still requires at least two supplied images.

3. Choose the number of columns. If you leave this setting unchanged, the collage uses two columns. The selected column setting determines how the cells are arranged across the grid.

4. Set the background color if needed. The default is white, represented by #ffffff.

5. Set the padding if needed. The default is 5 pixels, providing spacing between the collage edges and cells.

6. Submit the operation and inspect the result. The tool uses the largest input width and the largest input height as the cell dimensions, resizes each image to those dimensions, and places the resized images in the grid.

How to read the result

A successful result is PNG image data representing the generated collage. The grid reflects the column setting you selected, while the cell size is based on the largest width and height among the supplied images. Because every image is resized to those cell dimensions, the output may not preserve each source image's original size or proportions.

A failure result means the operation did not produce a collage. Typical causes include supplying fewer than two images, providing invalid Base64 image data, using an image format that cannot be opened, or encountering another image-processing problem. Correct the inputs and submit again rather than treating a failure as a valid image output.

Worked example

A designer wants to place three product photos in one horizontal collage for a presentation.

A designer prepares three valid Base64 image values, supplies them as the image collection, selects three columns, and leaves the background and padding at their defaults.

A successful operation returns PNG image data for a collage with three arranged image cells.

Limitations

• Fewer than two images cannot produce a successful collage, only the first nine supplied images are processed, and every image is resized to cells based on the largest input width and height. Invalid or unsupported image data can produce a failure instead of a collage.

Common errors

• Supplying one image or malformed Base64 data prevents a successful collage. Provide at least two valid Base64 image values and verify that each one can be opened as an image before submitting.

FAQ

How many images can I combine in one collage?

A successful collage requires at least two images. The tool processes no more than the first nine supplied images, so only those first nine can be included when more are provided.

What is the default number of columns?

The default is two columns. You can choose a different column setting, which determines how the collage cells are arranged across the grid.

What does the tool return?

A successful operation returns PNG image data. If the image data is invalid, an image cannot be opened, or another processing issue occurs, the operation returns a failure instead.