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How to Merge Images Online: Side by Side, Vertical, or Grid

Combining pictures is useful for before-and-after comparisons, product screenshots, simple collages, scanned pages, and social posts. A browser-based image merger can do this without sending photos to a server.

Merge images online with the free tool →

Choose the right layout

How to combine pictures online

  1. Select two or more images.
  2. Arrange their order before exporting.
  3. Choose horizontal, vertical, or grid layout.
  4. Set gap, alignment, and background color.
  5. Download one combined image and verify its pixel dimensions.

Keep images sharp

Use original files when possible and avoid repeatedly re-exporting JPEGs. If images have very different sizes, resize them first or choose an alignment that makes the difference intentional.

Privacy and file size

Large merges can use significant browser memory. NeatJSON processes images locally; nothing needs to be uploaded.

Practical checklist

Choose a consistent output format and inspect the final dimensions before downloading. PNG is useful for transparency and sharp graphics, while JPEG is smaller for photographs. Very large images can use considerable browser memory, so resize first when possible. Keep the original files because a merged export is not a substitute for source images.

Using this tool well

For the best result, begin with a copy of the original asset and inspect the exported file at its intended size. Browser support and image formats can affect color, transparency, metadata, and compression. Keep the source file when quality or future edits matter, and test the final asset in the destination where it will be used.

Processing happens in your browser unless a page clearly says otherwise. That makes this tool convenient for routine work, while still leaving you in control of what you copy, save, or share.