Side-by-side comparisons and stacked contact sheets need one file, not a folder of loose shots. The free ToolXoX Merge Images tool lines photos up vertically or horizontally, can resize them to match, then previews the combined still so you can download JPG or PNG without installing an editor.
When Merge Images Fits
Use it when separate photos should become a single strip or stack. Common jobs:
- Before and after pairs for blogs and reviews.
- Colour or layout comparisons for design handoffs.
- Contact sheets that put several product angles in one download.
- Simple collages where subjects share similar light and scale.
Add pictures in the order you want them to appear. You can merge more than two. For collages, keep subjects at similar sizes and lighting so the finished image reads as one set.
What You Get on Merge Images
On the tool page you upload images, choose merge direction (Vertically or Horizontally), pick a resize option (Do Not Resize, Resize to Lowest Dimension image, or Resize to Highest Dimension image), click Merge Image, preview the combined result, then download. Free to use, no signup. It works on phone and computer.
If sizes differ, resize-to-lowest keeps a tidy edge with smaller files. Resize-to-highest keeps more detail but can upscale softer shots. Leaving resize off preserves each file's native size and can leave uneven edges.
How to Merge Images
1. Gather the photos in the order they should appear left to right or top to bottom.
2. Open the Merge Images tool on ToolXoX on your phone or computer.
3. Upload the images one by one in that order.
4. Select Vertically or Horizontally, then choose a resize option.
5. Click Merge Image and check the preview for uneven edges or odd gaps.
6. Download JPG or PNG once the strip looks right.
Name the file for the job, like before-after-horizontal.png, so you can find it later.
Direction and Resize
Horizontal merges place images side by side. Vertical merges stack them. Uneven heights on a horizontal strip look ragged unless you resize first or let the tool match dimensions.
- Side by side: match heights (lowest or highest) for a clean bar.
- Stacked: match widths the same way so the column stays straight.
- Do Not Resize: only when every file already shares the edge you care about.
Don't mix a tall portrait with a wide landscape on a horizontal strip without a resize choice. The edges will step.
Source Tips
- Upload in final order; the tool merges in the sequence you add.
- Prefer similar lighting so the strip feels like one set.
- Crop empty borders before merge when they waste space.
- Pick PNG for hard graphic edges; use JPG for everyday photo strips.
Two well-matched product shots usually merge cleaner than five random phone snaps with different zooms.
When you build a long strip, check the preview at full width once; thumbnail views hide stepped edges that show up in the real download.
Conclusion
Add the photos in order, choose vertical or horizontal, set a resize option that matches the edges you need, then Merge Image and download. A tidy strip starts with consistent order and sizing, not with fixing ragged edges after the fact.
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