Getting started
Choose 2–12 images. A valid new selection replaces the previous list. Use Up and Down to reorder and Remove for individual items. Vertical joining matches widths; horizontal joining matches heights to the maximum edge. With enlargement off, smaller originals stay centered at their own size. Transparency is PNG-only; JPEG uses the chosen background. Generate, check dimensions and preview, then save. Originals stay unchanged. Changing settings or order hides the old result. After reloading, select the files again.
Rules and limits
2–12 static JPEG/PNG/WebP, 50 MiB total. Each source up to 50 MP/32768px per edge; output 12 MP/8192px per edge. No animation, SVG or HEIC.
Files and names stay in this browser, without upload or storage.