Put Images Side by Side — Compare Photos Online Free

Side by Side is the simplest way to put two images next to each other for instant comparison. Upload two photos, toggle between horizontal and vertical orientation, and the tool automatically matches their dimensions for a clean, proportional result.

Unlike generic image mergers that handle many images with various layouts, this tool is optimized for the specific task of comparing exactly two images. It auto-scales both images to matching dimensions, adds an optional divider line, and lets you download the combined result in PNG or JPG.

Why Put Images Side by Side?

Side-by-side comparison is one of the most effective ways to highlight differences or progress between two images. It eliminates the need to switch back and forth between files, giving viewers an instant visual reference.

Whether you are showing before-and-after results, comparing two design options, or creating a visual A/B test for stakeholders, placing images side by side makes the comparison immediate and intuitive.

Key Features

• Auto-dimension matching — In horizontal mode, both images are scaled to the same height. In vertical mode, they are scaled to the same width. Aspect ratios are always preserved.
• Optional divider — Add a thin line between the two images for a clean visual separation.
• Horizontal or vertical — Place images left-right or top-bottom depending on your content.
• Flexible output — Download the comparison as PNG (lossless) or JPG (smaller file size).
• Privacy-first — All processing runs locally in your browser. Your photos never leave your device.

Popular Use Cases

• Before and after — Show renovation results, weight loss progress, photo editing effects, or product improvements.
• Design comparison — Compare two logo options, color schemes, or layout variations for client review.
• Product comparison — Place two competing products side by side for review articles or buyer guides.
• Photo editing — Show the original vs. edited version of a photo to demonstrate your editing skills.
• Social media — Create comparison posts for Instagram, Twitter, or Facebook without using multiple-image carousel.

Side by Side vs. Image Merger

Our Image Merger handles up to 20 images with horizontal, vertical, and grid layouts. Side by Side is designed specifically for two images with automatic dimension matching — perfect when you want a quick, clean comparison without extra options.

Try cropping your images into circles or converting them to grayscale before placing them side by side. Explore our other tools: merge JPG files, merge PNG with transparency, or overlay and superimpose images.