What is the short answer?
Match the canvas shape to the paper, use original high-resolution photos, leave safe space near edges and export the 2× HD file.
Start with the intended print shape
Choose the paper or frame before arranging photos. A square collage fits square output, while common rectangular prints need a matching portrait or landscape composition. If the file and paper use different proportions, the print service may crop the outside edges or add borders.
Use the best source files available
Printing reveals blur that can be hard to notice on a phone. Work from original camera files when possible, not screenshots, messaging previews or images downloaded from social platforms. Avoid enlarging a tiny photo to fill the largest frame.
Keep the layout readable
Choose fewer photos when the print will be small. Give the strongest image more space, then use supporting frames for details. Check every crop at the final composition, especially faces, hands, text and landmarks near an edge.
Allow for trimming
Printers can trim a small amount around the outside of a borderless print. Keep essential content away from the canvas edge and use a little extra breathing room around faces. A visible outer margin is safer when precise edge-to-edge placement matters.
Export, then confirm with the printer
Enable 2× HD to maximize the pixels available from Collage Maker. PNG avoids another lossy save, while high-quality JPG is widely accepted and smaller. Before ordering, compare the downloaded pixel dimensions with the print service's current requirements and review its crop preview. The web tool exports RGB images and does not provide professional color profiles or press-ready bleed controls.
Which sources support this guide?
These primary references support the format, browser-processing and output guidance above. CollagePlus also tests each workflow against the current tool.