Merge Images Online

Combine several images side by side, stacked vertically or in a grid. Set spacing, alignment and background, then download one PNG or JPG — all in your browser.

Drop images to merge here

or click to browse — PNG, JPG, WebP · up to 30 images

🔒 Images are merged locally in your browser and never uploaded.

Frequently Asked Questions

How do I merge two images side by side?

Drop both images into the tool, keep the direction on Horizontal and leave Match heights on so they line up neatly. Adjust spacing or background if you like, then download the merged picture as PNG or JPG.

Can I combine images vertically or in a grid?

Yes. Choose Vertical to stack images on top of each other (ideal for long screenshots) or Grid and set the number of columns to build a collage such as 2×2 or 3×3.

Are my images uploaded to a server?

No. Images are decoded and drawn on a canvas inside your browser. Nothing is uploaded or stored, so private photos and confidential screenshots stay on your device.

Can the merged image have a transparent background?

Yes. Tick Transparent and export as PNG: spacing and empty areas stay transparent. JPG does not support transparency, so those areas are filled with white.

Why was my merged image scaled down?

Browsers cannot create canvases larger than about 16,384 pixels per side, and very large images can crash on phones. When the layout exceeds 16,384 px or about 40 megapixels, the tool scales the whole result down proportionally and warns you first.

How many images can I merge at once?

Up to 30 images. Use the up and down arrows to change their order; the preview updates instantly.

How to Merge Images

  1. Add your images — drop PNG, JPG or WebP files; you can add more at any time.
  2. Choose a layout — Horizontal for side-by-side, Vertical for a stack, or Grid with 2–10 columns.
  3. Arrange them — move images up or down; the number shows their position in the result.
  4. Style it — set spacing, alignment and a background colour, or make the gaps transparent.
  5. Download — export at full resolution as PNG (lossless) or JPG (smaller).

What People Use It For

  • Before/after comparisons — renovation, retouching, design iterations or UI changes shown side by side with a thin white gap.
  • Bug reports and documentation — stack several screenshots vertically so a reviewer sees the whole flow in one image instead of five attachments.
  • Product listings — marketplaces often allow a single image per slot; a 2×2 grid shows colours or angles together.
  • Social media collages — a 3-column grid of square photos, or two portraits side by side for a story.
  • ID uploads — some forms ask for the front and back of a card in one file; stack them vertically.
  • Memes and reaction images — classic two-panel or four-panel formats.

How Layout and "Match Size" Work

Images rarely share the same dimensions. In a horizontal row, a tall portrait next to a short landscape leaves empty space. With Match heights on, every image is scaled to the height of the shortest one, keeping its aspect ratio, so the row forms a clean band with no gaps. The tool scales to the smallest image rather than the largest so that nothing is enlarged and blurred. In vertical mode the same idea applies to widths.

In a grid, every cell has the size of the largest image. With fitting on, each image is scaled to fill its cell without cropping; with it off, images keep their original pixels and the alignment setting decides where they sit inside the cell. Alignment also controls whether shorter images in a row hug the top, middle or bottom.

Size Limits and Output Format

Ten 12-megapixel phone photos in a row would produce an image over 40,000 pixels wide, which no browser can draw. The tool therefore caps the result at 16,384 pixels per side and about 40 megapixels, scaling everything down proportionally and telling you before you download. Choose PNG for screenshots, text and transparency, and JPG for photo collages, where it is typically five to ten times smaller.

Tips for Clean Results

  • Crop to a common ratio first — a grid of square photos looks tidier than mixed shapes with gaps.
  • Use 8–20 px spacing with a white or dark background to separate photos visually; use 0 px to stitch panoramas or long screenshots seamlessly.
  • Label comparisons — put the "before" image first so readers scan left to right or top to bottom naturally.
  • Mind the file size — a PNG collage of photos can easily exceed 10 MB; switch to JPG at 85–92% quality for sharing.

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