No. Compositing runs on Canvas; images never leave your browser.

What's the difference between Horizontal and Vertical strips?

Horizontal normalizes the heights and lays the images out left-to-right; Vertical normalizes the widths and lays them top-to-bottom. Aspect ratios are preserved.

How is the grid cell size decided?

Each cell uses the maximum width and height across all inputs. Every image is centered inside its cell using `contain`, with letterboxes filled by the background color.

What if the output is too big?

Run the resize tool on the result. Compositing keeps the original resolution to preserve quality.

Does JPEG output keep transparency?

No — JPEG has no alpha channel, so transparent areas are flattened to the chosen background color. Use PNG or WebP to preserve transparency.

Back to Image

Image collage — grid / horizontal / vertical layout

Combine multiple images into one — as a grid, a horizontal strip, or a vertical strip. Composited via Canvas entirely in the browser. Tune columns, gap, padding, background color and output format (PNG / JPEG / WebP). Reorder with up/down buttons.

imagemerge

How to use

Drop two or more images, pick a layout (Grid / Horizontal / Vertical), then click Create collage. Canvas composes them with the chosen column count, gap, padding and background color. Use the up/down buttons to reorder, and choose the output format (PNG / JPEG / WebP) before downloading.

FAQ

Are images uploaded?: No. Compositing runs on Canvas; images never leave your browser.
What's the difference between Horizontal and Vertical strips?: Horizontal normalizes the heights and lays the images out left-to-right; Vertical normalizes the widths and lays them top-to-bottom. Aspect ratios are preserved.
How is the grid cell size decided?: Each cell uses the maximum width and height across all inputs. Every image is centered inside its cell using `contain`, with letterboxes filled by the background color.
What if the output is too big?: Run the resize tool on the result. Compositing keeps the original resolution to preserve quality.
Does JPEG output keep transparency?: No — JPEG has no alpha channel, so transparent areas are flattened to the chosen background color. Use PNG or WebP to preserve transparency.

Related tools

Image resize — by px or %, keep or lock aspect ratio

Resize JPEG / PNG / WebP images by specifying the longer side in pixels — aspect ratio is preserved. Batch process multiple files and download individually or as a ZIP. Runs entirely in your browser.

imageresize

Image watermark — overlay text or image at 9-grid position

Overlay a text or image watermark onto your photos. Composited via Canvas entirely in the browser. Choose position (9-grid), size, opacity and margin. Batch-process and download as a single ZIP. Output keeps the original format (PNG / JPEG / WebP).

imagewatermark

Image stack — average / median / lighten / darken multiple images

Combine multiple same-size images (JPEG / PNG / WebP) into one PNG by stacking them per-pixel: average for astrophotography noise reduction, median to remove people from a busy scene, maximum (lighten) for star trails or firework composites, minimum (darken) to keep the dark frames. Runs entirely in Canvas + getImageData; your photos never leave your device.

imagemerge

Convert AVIF photos to JPG / PNG / WebP — compatible everywhere

Decode .avif images with the browser-native AVIF decoder and re-encode them as JPEG / PNG / WebP. AVIF is great for the web but older Safari versions, email clients, Slack and Office still can't preview it — convert before sending. Batch conversion with single-click ZIP download is supported. Files never leave your device — everything runs in the browser.

imageconversion