Why merge images together?
Before and after comparisons are one of the most compelling visual formats in content marketing, fitness, beauty, home renovation, and product photography. A side-by-side layout makes the change immediately obvious without requiring viewers to scroll back and forth between two separate images.
For tutorials and how-to content, combining step images into a single horizontal strip makes the sequence clear and reduces the number of separate image files needed in a post. Recipe blogs, craft tutorials, and repair guides all benefit from this approach.
Social media sometimes favors a single wide image over a two-image carousel, especially in contexts like Instagram Stories, Twitter posts, or LinkedIn updates where a combined image looks more intentional than separate uploads.
Merge two images in three steps
All processing is instant and completely private. No account needed, always free.
Upload both images
Add the first and second image. Both can be different formats (JPEG, PNG, WebP) and different sizes.
Choose layout and settings
Select horizontal (side by side) or vertical (stacked). Set a gap between images and choose a background color for empty areas.
Download merged image
Click Merge and download. The output is a PNG that combines both images in your chosen layout.
Tips for merging images effectively
Match dimensions for clean results
Two images of similar dimensions produce the cleanest merge. Wildly different sizes result in large empty areas or a very unbalanced layout.
Use a gap to separate the images
A small gap (20-40px) with a contrasting background color makes each image distinct and improves readability for comparison shots.
White background for product shots
For before/after product comparisons on white backgrounds, a white fill behind the images creates a clean, professional look.
Resize images first for balance
If your images have different dimensions, use the Image Resizer to bring them to the same width before merging for a balanced layout.
PNG output preserves quality
The output is PNG, which is lossless. If you need a smaller file, compress the merged PNG or convert it to JPEG after merging.
Frequently asked questions
What if my images have different heights?
In horizontal mode, the canvas height matches the taller image. The shorter image is centered vertically. The background color fills any empty space around the shorter image.
What is the output format?
The merged image is saved as PNG to preserve quality across all input types.
Is there a file size limit on the inputs?
Each input image can be up to 20 MB. Very large images may take a moment to process in the browser.
Is my image private and secure?
Your images are processed securely and stay private. They are never shared or stored anywhere.