Why not just the first collage app?

Many collage apps from the stores are ad vehicles: they work for free but stamp a watermark onto the finished image or demand a subscription to remove it. And you don't even need them — your phone and computer already have everything to build a clean collage with no logo.

On the phone

  • Android (Google Photos):open Google Photos → “Collage” at the top or under “Create” → select photos (usually up to six) → done, no watermark. Layouts can be tapped.
  • iPhone:the Shortcuts app has a ready-made “Photo Grid” shortcut that assembles selected photos into a grid. Alternatively, place several photos into a note or a slide and export the result.

On the computer: the underrated presentation trick

A route almost nobody thinks of: presentation or word-processing programs (PowerPoint, Keynote, Google Slides, LibreOffice Impress). Set up a slide in the desired format, drag the images in, arrange them in a grid — and export the slide as an image or PDF. No special tool, full control over position and spacing, no watermark. For a square social media collage, just set the slide to 1:1.

The grid makes the difference

Whether the collage looks professional or cobbled together comes down to the arrangement:

  • Equal gaps between all images — uneven spacing looks messy.
  • Uniform tiles or a deliberately graded layout (one large image plus smaller ones) — not randomly mixed.
  • Matching aspect ratios for a clean grid. Bring the images to the same ratio beforehand with the crop tool — otherwise the grid frays at the edges.

For extra harmony, give all images a shared color mood — the same principle as a moodboard: pick tones that belong together rather than clashing.

The export

  • For social media: export in the platform's target format (e.g. 1080 × 1080), as JPG Q85.
  • With text or sharp dividers: as PNG, so edges stay crisp.
  • For print: 300 dpi at target size; for an A4 collage suitably high-resolution, ideally as a PDF.

If the finished collage is too big to upload, the compression tool helps afterward — browser-local, without the images leaving your device.

In short

  • Skip watermark apps — use Google Photos, Shortcuts, or slides.
  • Presentation software = free layout control on the desktop.
  • Equal gaps, matching ratios make it look professional.
  • Export to target size; compress if too big to upload.