Merge Images Vertically (Free, Stack Top-to-Bottom)
Combining screenshots, panes or product shots into one vertical image is the classic way to build before/after graphics and long-form comparisons. The Merge Images tool stacks them — in your browser, with zero upload.
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Open Merge Images VerticallyWhen vertical merging shines
Before/after sliders as a single static image, screenshot tutorials, UI flows, and comparison strips all use vertical stacks. One file, one share link, perfect ordering.
Stack images in one flow
- Open the Merge Images tool.
- Upload the images in order, top-first.
- Choose stacked (vertical) mode.
- Set a gap and background color if needed, then download.
Keep the widths consistent — the merger aligns all panes to the same final width.
Format for every destination
Export PNG for crisp screenshots and text, or JPG for photos. For web use, compress the merged result to keep the single image lightweight.
When a vertical stack beats a side-by-side grid
Stacking images on top of each other is the right layout whenever the reading order is linear: a sequence of chat screenshots, a receipt followed by its confirmation, a multi-part tutorial, or before/after frames that work better one under the other than next to each other. Side-by-side layouts force the eye to jump horizontally and break as soon as the source images have different widths.
Two practical details decide the quality of the result. Merge at the original resolution instead of a preview size, so text in screenshots stays readable - the whole point of stacking screenshots is that people will zoom in on them. And keep the width consistent: our tool scales narrower images up to the widest source (or pads them) so the edges align cleanly instead of producing a ragged strip that looks broken on social feeds.
About this guide
- Written by
- The ImageTools Pro team
- Last reviewed
- October 2026
- How we test
- Steps run in a real browser on real PNG, JPEG and WebP files
We revise this page whenever browser APIs, format support or recommended settings change. Corrections are welcome — tell us from the contact page.
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Frequently Asked Questions
Can I control the gap between images?
Yes — the tool lets you set a custom gap and background color between panes.
What if my images have different widths?
The merger normalizes them to a consistent width automatically for a clean stack.
Is vertical merging different from side-by-side?
Yes — vertical stacks top-to-bottom; side-by-side places them left-to-right. The same tool does both.