Merge Images

About Image Merging

Image merging stitches two pictures into one canvas — used daily by real-estate agents (before/after staging), fitness coaches (transformation pics), Etsy sellers (product collages for thumbnails), eBay listers (multi-angle product shots in a single image slot), teachers building worksheets, and anyone who needs to send 'these two photos' as one file to a recipient who can't handle attachments. The challenge is alignment: two phone shots in portrait and landscape look terrible if you just paste them together. This tool handles the math — resizes the bigger image down (or smaller up), keeps aspect ratios so nothing stretches, lets you add a divider border or matching background. All processing happens in your browser via the canvas API; nothing uploads.

What image formats are supported?

This tool supports all common image formats including JPEG, PNG, WebP, BMP, and GIF. You can merge different formats together, and the output format can be selected independently.

How does image positioning work?

You can arrange images either horizontally (side-by-side) or vertically (top-bottom). The tool automatically calculates the optimal canvas size based on your chosen layout and alignment preferences.

What size adjustment options are available?

You can reduce the biggest image, enlarge the smallest image, fit both to the same width or height, or keep original sizes. The 'Constrain proportions' option maintains aspect ratios to prevent distortion.

Can I customize the border and background?

Yes, you can set border thickness (0-50px), choose border color using a color picker or HEX input, and select background color. These options help create professional-looking merged images.

What are the size limits?

Maximum input file size is 10MB per image. The merged image will have dimensions calculated based on the input images and chosen options, so there are no size restrictions on the output.

Should I pick horizontal or vertical layout?

Horizontal works for landscape photos and before/after comparisons where the eye scans left-to-right. Vertical suits portrait phone photos, recipe step-by-steps, and Instagram Stories (9:16). For mixed orientations — say, a landscape map and a portrait selfie — horizontal usually wins because vertical stacking leaves big empty bars beside the narrower image. Test both; the preview updates instantly.

Why is my merged JPG showing a black bar between images?

Black bars appear when you choose 'No resize' and the two images have different heights (horizontal layout) or different widths (vertical layout). The empty area defaults to the background color. Fix it by either picking a 'Fit to width/height' option so both images align, or set the background color to white or whatever color matches your design. The 'Reduce biggest' option is the safest auto-fit choice.

Does the order of selection matter?

Yes — Image 1 sits on the left (horizontal layout) or on top (vertical layout). Image 2 is on the right/bottom. For before/after comparisons, the convention is before on the left, after on the right, so people read the improvement intuitively. If you got the order wrong, click the X on either slot to clear and re-upload — no need to reset the whole tool.

Can I merge more than two images at once?

Not in a single pass — this tool is purpose-built for two-image merges with maximum control. For 3+ images use our Collage Maker tool instead, which handles grids and templates. A workaround for 3 images: merge two first, download, then merge the result with the third. Quality is preserved each pass if you stick to PNG output; JPG re-encoding can introduce slight artifacts.

Will the merged image have a watermark?

Never. There's no watermark, no logo overlay, no signup wall, and no usage tracking. The output is exactly what you see in the preview — pixel-for-pixel. Free for personal and commercial use; you own the resulting file. If a watermark appears, your image source already had one — clear both slots and re-upload originals.

Does it keep transparency, or will it flatten my logo's background?

It depends on the output format. PNG and WebP preserve an alpha channel, so transparent areas of your source images stay transparent — ideal for product cutouts, logos, or stickers on a transparent background. JPEG has no alpha channel, so any transparency is flattened onto whatever you set as the Background color (white by default). The border/divider you add is always drawn in the chosen border color, never transparent, so a 0px divider gap and 0px border with PNG output gives you a clean merge with no painted edges. If your logo's background turns white after export, switch the output format from JPEG to PNG.

How do I hit an exact output size or DPI for print or a marketplace?

Set 'Max output width (px)' to your target — e.g. 1600 for eBay, 2000 for Etsy, 1080 for Instagram. The tool merges at full resolution first, then proportionally downscales the whole canvas to that width with high-quality smoothing, and the exact final pixel dimensions are shown in the Final Format field after merging. Leave the field blank for 'auto' (full native resolution). For print DPI, decide the physical size first: pixels = inches × DPI. A 6×4 inch photo at 300 DPI needs 1800×1200 px, so set max width to 1800 (landscape) and pick 'Fit to height' so both images share an edge. Always scale down from larger originals rather than up, to avoid softening.