Four separate uploads are four separate inputs: nothing in the layout ties photo 1 to photo 2, so the comparison has to happen in words. Merge them into one grid and the photos arrive as a single image, in one layout, with the differences sitting right next to each other.

A grid changes the game. By combining four images into one, you get one image and one layout: the arrangement of the photos is in the file itself, not only in your prompt. You can then point at it directly ('the two on the left are before, the two on the right after').

Because MergeFrame runs entirely in your browser using the Canvas API, your images never leave your device. No upload to a server. No account. No watermark. Just the grid you need, ready for AI analysis.

**AI Image Preparation Best Practices:** Label your images before combining: add a simple label at the top of each screenshot. Order them left-to-right, top-to-bottom in reading order. Use consistent 2-4px gap between images. Avoid dark mode screenshots on dark backgrounds: set a light background in MergeFrame. One grid, one task: don't cram unrelated images together.

ChatGPT users: See our dedicated guide: Combine Multiple Images for ChatGPT: merge up to 12 photos into one grid the model sees as a single image. Free, no signup.

Gemini users: See our dedicated guide: Combine Multiple Images for Gemini Vision: structured grids, cell resolution tips, and ready-to-use prompts.