Merge Images
Stitch images into one picture, vertically or horizontally.
How to use Merge Images
- Add the photos you want to stitch into one picture.
- Choose a direction — vertical stacks them top to bottom, horizontal places them side by side.
- Drag the cards, or use the arrow buttons, to set the order; the preview updates as you go.
- Set the gap, background colour and whether to align sizes, then export as JPG, PNG or a single-page PDF.
How Merge Images works
Stack photos into a single picture, either top to bottom or left to right. Drag the cards to set the order — or use the arrow buttons on each card, which work on touchscreens and with a keyboard — and the preview updates instantly to match.
Align size normalises every image to a common width when stacking vertically, or a common height when stacking horizontally. You choose whether to match the largest image, the smallest, the first one, or a custom pixel value. Aspect ratio is always preserved; images are scaled, never stretched.
Set the gap between images and the background colour that shows through it, then export as JPG, PNG or a single-page PDF. The preview renders at a reduced resolution for speed, while the export is generated at full resolution from the same layout code.
Frequently asked questions
Are my files uploaded to a server?
No. This tool runs entirely inside your browser — the file is read from disk by the page and never transmitted. It keeps working even if you disconnect after the page has loaded.
Will my images be stretched or distorted?
Never. When Align size is on, each image is scaled proportionally to the target width or height, so the aspect ratio is always kept. Any leftover space takes the background colour you chose.
Does the preview match what I download?
Yes. The preview and the export share the same layout calculation, so ordering, spacing, alignment and background are identical. The preview is simply drawn at a lower resolution so it stays fast.
What happens with very large images?
Browsers cap how large a canvas can be. If your combined image would exceed that limit, the tool scales the output down and tells you the exact final dimensions beforehand, rather than crashing the tab.
Which output format should I pick?
PNG is lossless and keeps transparency. JPG produces much smaller files and fills transparent areas with your background colour. PDF wraps the stitched image on a single page sized to match it.