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Free online tool

Online Image Merge Tool

Merge 2–30 images into one PNG, horizontally or vertically, with resizing, centered cropping and transparent spacing.

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What this tool actually does

Combines between 2 and 30 uploaded images into one PNG, either side by side from left to right or stacked from top to bottom. Files must be browser-decodable image types, each at most 25 MiB and 24 million pixels; the selected batch is limited to 100 MiB and 40 million source pixels.

Checkable behavior

Four size modes are available. Do not resize preserves every source dimension. Enlarge smaller images scales their cross-axis to the largest height for a horizontal merge or largest width for a vertical merge. Reduce larger images scales to the smallest cross-axis. When Preserve aspect ratio is checked, both dimensions scale together; otherwise only the cross-axis is stretched.

Controls, output and limitations

Crop larger images uses a centered source crop without scaling: horizontal merging crops excess height, while vertical merging crops excess width, both to the smallest source cross-axis. The aspect-ratio checkbox does not alter crop mode because pixels are removed rather than stretched.

Border width defaults to 0 and is rounded and clamped to 0..1000 px. The transparent canvas gap appears between images; there is no border-color control. Images remain in upload order and align to the top in horizontal mode or left in vertical mode when their cross-axis sizes differ.

The merged canvas is rejected above 10000 px in either dimension or 24 million pixels. Output is a PNG named merge-1.png. Processing and preview happen in the browser with no upload, but decoded canvases still use device memory; use smaller sources on mobile. No JPEG/WebP export, spacing color, drag reordering, EXIF orientation editor or cloud storage is provided.

View all

Select 2–30 images and check their preview order. Generate the result, inspect it, then use Download separately to save merge-1.png. Selecting files again replaces the whole batch and invalidates the previous result. Clear removes the files and result but keeps direction, size mode, aspect-ratio choice and gap width.

25 MiB = 26214400 B; 100 MiB = 104857600 B.

Resized dimensions are rounded to whole pixels, with a minimum of 1. No resize keeps the original dimensions; the aspect-ratio checkbox only affects enlarging and reducing. A transparent gap is added between images, with no outer border. Empty or non-finite gap input becomes 0; numeric values are clamped to 0–1000 and rounded.

Processing takes place locally in your browser.