For a collage to look good on paper, choose the print format before you start arranging photos: the canvas size sets both the proportions and the final resolution. The editor has ready print formats — A4, A3, A5, photo paper 10×15, 13×18, 20×30 and a 20×20 square — all at 300 DPI, as a print shop expects. You can also set your own size. The service is free and runs in your browser, on desktop and phone.
Choose a print format
Open the “Canvas size” panel and pick a ready format — the canvas and all cells snap to the right proportions at once. Sizes are given in pixels at 300 dots per inch (DPI), the standard for quality printing:
- A4 — 2480×3508 px, a regular sheet and the most common choice.
- A3 — 3508×4961 px, a large wall poster.
- A5 — 1748×2480 px, half a sheet.
- Photo 10×15 cm (≈4×6 in) — 1181×1772 px, the classic print.
- Photo 13×18 cm (≈5×7 in) — 1535×2126 px.
- Photo 20×30 cm (≈8×12 in) — 2362×3543 px, a large print.
- Square 20×20 cm — 2362×2362 px, for square frames and photo books.
Portrait or landscape
The ready formats are portrait — taller than they are wide. For landscape (horizontal) orientation, set your own size with the width and height swapped: A4 on its side, for instance, is 3508×2480. You can make 10×15 or 20×30 horizontal the same way.
Your own print size
If the format you need isn’t in the list, choose “Custom size” and type the width and height in pixels (from 300 to 8000). To convert to pixels for print, multiply each side in centimetres by 118 (or in inches by 300) — that’s 300 DPI. For example, a 30×30 cm photo book is about 3543×3543 px, and a 12×18 in poster is 3600×5400 px.
Download a PDF for printing
When the collage is ready, in the “Download” window choose PDF and turn on the “Print quality (300 DPI)” toggle — the file is rebuilt from the full-resolution originals and is ready for a print shop. For more on file formats, quality and where the browser puts the download, see “How to save and download a collage”.
To keep prints sharp
Printing is unforgiving of small photos: what looks great on screen can come out blurry on paper. A few rules:
- Use shots with the green quality check — the editor tells you whether the resolution is enough for the chosen format.
- If you see a red low-resolution warning, swap that photo for a larger one.
- Set margins and cell gaps in advance: for edge-to-edge printing leave a little safety margin so the cutter doesn’t clip the image.
Pick a ready layout for the number of shots on the standard templates page, and find the fine points of preparing photos in “Photo editing”.
