Support

How does the automatic layout work?

Load a folder of photos and the app automatically distributes them across as many pages as needed, generating a randomised mosaic-style layout for each page. You can then freely adjust any page afterward — move, resize, or swap individual photos, add frames or text boxes, and fine-tune anything you like.

What photo formats are supported?

JPEG, PNG, WebP, TIFF, and BMP are fully supported on both Mac and Windows. HEIC/HEIF photos (the default format for recent iPhone photos) are also supported on Mac, since macOS can decode these natively — on Windows, HEIC/HEIF photos aren't supported and will be skipped, since that decoding support isn't available on that platform.

What page size should I use for a photobook?

Photobook services rarely use exact ISO paper sizes — an "A3" photobook usually isn't 420×297 mm. Use the size the service itself specifies, entered as a custom size in millimetres at 300 DPI, and check whether they want a single page or a double-page spread (a spread is roughly twice the width). The Help guide lists the sizes and margins I've tested with Photobox, Printerpix and Mixbook. Whichever service you use, order a test print before laying out a large book — book sizes and printing software do change over time.

How do I export or print my collage?

Use Export Page or Export All to save your pages as JPEG images (or a ZIP of JPEGs for multiple pages). To print, use the Save for Printing option, which prepares your pages for you to print from Preview.

Where are my exported files saved?

You'll be asked to choose a save location each time you export, print, save a session, or create an archive — nothing is saved automatically to a fixed location.

Can I save my work and come back to it later?

Yes. Use Save to store your current project as a session file, and Restore to reload it later. Use Archive to bundle your project together with copies of the photos themselves into one portable file — useful if you want to move a project to another computer. You can also save a layout as a Template, without photos, to reuse the same design with a fresh set of photos.

Does this app use the internet or collect any data?

No. Mosaic Collage Maker works entirely offline and does not collect, transmit, or share any data. See the Privacy Policy for full details.

What are the system requirements?

Mosaic Collage Maker runs on macOS and Windows. For best performance with very large photo libraries (hundreds of photos across many pages), a computer with sufficient available memory is recommended.