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PulsarKit

Make a photo collage

Put two to twenty photos on one canvas, as a grid, a mosaic, a filmstrip or placed by hand, and download the result as a single picture.

Drop your files here

.jpg, .jpeg, .png, .webp, .avif · up to 50 MB

How to Build the collage

  1. 1

    Add your photos

    JPG, PNG, WebP or AVIF, two to twenty of them, up to 50 MB each and 300 MB in total. Drag the cards to set the order.

  2. 2

    Pick a layout and set the gaps

    Grid, mosaic, filmstrip or free placement. Gap, padding, background colour, corner radius and shadow all update the preview as you move them.

  3. 3

    Download the collage

    One file comes back: collage.jpg, or collage.png if you asked for a transparent background.

Four ways to arrange the same photos

A grid divides the canvas into equal cells and fills them in card order, which is what you want when the pictures belong together and none of them is the point. A mosaic keeps every photo at its own shape instead: it sorts them by how wide they are, packs each row until the row is a sensible height, and stretches the row to the full width, so the result looks arranged by hand rather than stamped out. A filmstrip is a single row or column, the shape that fits a story told in order. Free placement drops the rules entirely and lets you drag each picture where you want it, overlapping if you like. The preview is the same calculation that builds the final file, so what you arrange is what you download.

Cropping, not squashing

A photo almost never has the same shape as the cell it lands in, and there are only two answers to that. Cover scales the picture until it fills the cell and trims what hangs over the edges; the collage has no gaps in it, at the price of losing a little from two sides. Contain scales it until the whole picture fits and fills the leftover space with your background colour; nothing is lost, at the price of visible margins. What never happens is stretching: the horizontal and vertical scale are always the same number, in both modes, so a face stays the shape it was. If the crop is taking something you need, switch to contain, or crop that photo deliberately first and come back.

Sizes for screens and for paper

The presets cover the places collages usually go: 1080 × 1080 for a square post, 1080 × 1920 for a story, 1920 × 1080 for a screen or a slide, and 2480 × 3508, which is A4 at 300 dpi, for something you intend to print. Anything else you can type in, up to 5000 pixels a side. Gap and padding are measured in pixels of that canvas, so the same numbers look thinner on a big sheet than on a small square; set the canvas first and then the spacing. Twenty photos on an A4 sheet is the heaviest job here and takes several seconds, most of it spent decoding the originals.

Finishing touches

The corner radius rounds every cell by the same amount, capped at half the shorter side so a small cell cannot round itself into an oval. The shadow is a soft dark edge under each picture, twelve pixels of blur offset four pixels down, enough to lift the photos off the background without looking like a slideshow from 2003. The background colour shows through the gaps, the padding and, in contain mode, the margins around each picture, so it does more work than it first appears; a mid grey or an off-white usually reads better than pure white. Turn the background transparent and the result comes back as a PNG with the gaps see-through, ready to drop onto something else.

The photos never leave your browser

Decoding, layout, drawing and encoding all happen inside this tab, on your own device. Nothing is uploaded, there is no account and no queue, and closing the tab clears every picture you added. That also means the work costs us nothing, so there is no limit on how many collages you make.

Frequently asked questions

How many photos can I put in one collage?

Twenty, and at least two. Above twenty the cells get too small to see and the browser starts struggling with the memory, so extra files are left out and the page tells you how many. The total across all the pictures is capped at 300 MB; if you are over it, compress them first; the link is on the error.

Will my photos be stretched or squashed?

No. Every picture is scaled by the same factor horizontally and vertically, in both cover and contain mode. Cover fills the cell and trims the overhang; contain fits the whole picture and leaves background-coloured margins. Neither one distorts a face or a building.

What is the difference between cover and contain?

Cover is about the collage looking solid: every cell is filled edge to edge, and whatever does not fit is cropped away, centred. Contain is about the photos staying whole: everything you shot is still there, and the space left over in each cell is painted with the background colour. Cover is the default because most collages are looked at, not studied.

How do I change the order of the pictures?

Drag the cards in the list, or use the up and down buttons on each card if you would rather not drag. Grid and filmstrip layouts follow that order exactly. Mosaic is the exception: it sorts by shape so the rows come out even, so the card order does not control it.

Can I print the collage on A4?

Yes. Choose the 2480 × 3508 canvas, which is A4 at 300 dpi, the resolution a photo printer actually uses. Use photos of a decent size for that: twenty small phone screenshots blown up to a third of a sheet each will look soft no matter what the tool does.

Are my photos uploaded to a server?

No. Everything runs in your browser, in this tab. There is no upload, no account and no daily limit, and the pictures are gone from memory as soon as you close the page.

How do I add a caption to the collage?

Build the collage, then send the result straight to Add Text. It is one of the next steps offered under the download button, and the file carries over without another upload. Add a border around the whole thing the same way.

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