How to merge images online
- Drop two or more pictures on the box above (or paste them one at a time with
Ctrl+V). - Pick a layout: Vertical stack, Side by side or Grid.
- Leave Resize to match on “scale down to smallest” so the edges line up, or keep original sizes if you want each image at its own resolution.
- Adjust the gap, border and background. Choose a fixed Canvas such as A4 if everything has to fit on one page.
- Drag thumbnails to change the order, then download as JPG, PNG or WebP.
Combine images vertically, side by side, or in a grid
The tool works as a simple photo combiner (developers would call it concatenating images): pick the direction the viewer's eye will travel.
- Stack images vertically when the result is read or scrolled top to bottom: long screenshots captured in pieces, chat threads, step-by-step instructions, a before/after where “after” sits below, or the front and back of a card on one page.
- Put images side by side (horizontal) for comparisons the eye scans left to right: two product options, before and after, a colour variation, or frames shown as a filmstrip. It also suits images that are already tall and narrow.
- Use a grid for four or more similar pictures with no single reading order: a photo collage, a moodboard, a contact sheet, or a product range. Auto columns makes the grid as square as possible (4 images → 2×2, 9 → 3×3).
Merge 2 images into one
The most common job is simply combining two pictures. Here is what the size math looks like, so you know what to expect before you download.
Worked example: a landscape and a portrait photo side by side
Photo A is 4000 × 3000 px, photo B is 1080 × 1350 px. With Side by side and Resize to match: scale down to smallest, both become 1350 px tall. A scales to 1800 × 1350, B stays 1080 × 1350, and the merged picture is 2880 × 1350 px (plus any gap). With “scale up to largest” both become 3000 px tall and the result is 6400 × 3000 — bigger, but B is enlarged almost 2.2× and will look soft. Scaling down is almost always the better choice.
Worked example: two screenshots stacked vertically
Two phone screenshots of 1170 × 2532 px stacked with a 20 px gap give 1170 × 5084 px. Set Max width to 1080 before sharing and the file becomes 1080 × 4693 px, small enough for WhatsApp to keep it readable.
Merge images into one page (A4)
Forms and offices often want several images “in one page”: the front and back of an Aadhaar, PAN, voter ID or driving licence, two receipts, or several certificates. Choose Vertical stack, a gap of 30–60 px, and set Canvas to A4 portrait. The tool builds a 1240 × 1754 px white page (A4 at 150 DPI, sharp enough to print and read), scales the merged images to fit inside a margin, and centres them. Print at “fit to page”, or turn it into a PDF with image to PDF. If a portal limits the file size, run the JPG through the image compressor.
JPG image merge: which format to download
| Format | Choose it when | Notes |
|---|---|---|
| JPG | The images are photos, or you are uploading to a form, WhatsApp or social media | Smallest for photos. No transparency — transparent areas become the background colour. |
| PNG | Screenshots, text, diagrams, or you need a transparent background | Lossless and sharp; larger for photos. |
| WebP | Websites and blogs | About 30% smaller than JPG at similar quality; not accepted by every upload form. |
Common uses
| You want to… | Layout | Settings that work |
|---|---|---|
| Before / after photo | Side by side or vertical | Match: smallest; gap 10–20 px so the seam is visible. |
| Compare two products | Side by side | Center alignment keeps both on the same eye line. |
| Long screenshot from several captures | Vertical | Gap 0, background matching the app, match: smallest. |
| Photo collage for Instagram | Grid | Canvas: Instagram square or portrait, gap 8–16 px, white or black background. |
| ID card front and back on one page | Vertical | Canvas: A4 portrait, gap 40 px, white background, JPG. |
| Filmstrip of frames | Side by side | Equal heights, small gap, dark background. |
What happens when images are different sizes
Images are never stretched. With Keep original sizes each picture keeps its own pixels: a vertical stack is as wide as the widest image, a side-by-side row as tall as the tallest, and smaller images are aligned (start, centre or end) with the background filling the rest. With Resize to match every image is scaled proportionally to the same width (vertical), the same height (side by side) or the same cell width (grid), so the edges line up. To prepare images to an exact size first, use the image resizer or image cropper.
FAQ
How do I merge two images into one?
Drop both images into the tool, choose Side by side or Vertical stack, set Resize to match so both have the same height (side by side) or width (stacked), then download the merged picture as JPG or PNG.
Are my images uploaded to a server?
No. The images are read from your device and drawn onto a canvas in the page. Nothing is sent anywhere and the merged file is generated in your browser.
How do I combine images vertically?
Choose Vertical stack. The images are placed one below the other in the order shown; drag the thumbnails to reorder. Set Resize to match to same size so the edges line up with no background showing at the sides.
How do I put two photos on one A4 page, such as the front and back of an ID card?
Add both images, choose Vertical stack with a gap of about 40 pixels, and set Canvas to A4 portrait. The merged images are scaled to fit inside the page margins on a white background, ready to print or convert to PDF.
What happens if the images are different sizes?
By default images keep their own size and are aligned within the widest or tallest one, with the background filling the leftover space. Choose Resize to match to scale them to the same width or height instead. Images are always scaled proportionally, never stretched.
Can I merge JPG and PNG images together?
Yes. You can mix JPG, PNG, WebP, GIF (first frame), BMP and AVIF in one merge. The result is saved as a single JPG, PNG or WebP file.
Is there a limit on the number of images?
There is no fixed limit, but the merged picture must fit the browser's maximum canvas size, about 16,000 pixels on a side. Use Resize to match with smallest, or set a maximum output width, when you combine many large photos.