Tips to create the best photo mosaic

A photo mosaic takes minutes to start — but the difference between a good result and one people genuinely can’t stop looking at comes down to a few key decisions. These tips are based on how our app actually works, and the settings our team recommends.

New to photo mosaics?

Read our guide first — What is a photo mosaic? — then come back here when you’re ready to create.

01

Use a desktop or laptop for the best experience

Our mosaic builder is designed for desktop — the tile grid, drag-and-drop tools, and preview panel all work best on a larger screen.
Mobile will open the app, but you’ll get a significantly better experience sitting down at a computer.
If you’re uploading a large tile set (200+ photos), a desktop connection is also faster and more stable.

02

More tile photos always means a richer mosaic — and square is ideal

The minimum is 100 tile photos. We recommend 300–500 for a mosaic that feels truly personal — more unique tiles means fewer repeated photos in the grid.
Square tile photos fill the grid most naturally. If yours aren’t square, that’s completely fine — the app automatically crops every tile to square.
You can also manually adjust the crop of any individual tile in Step 4 (Preview).
Not enough photos? The app will automatically duplicate your tiles to fill the grid. It works, but a higher variety of unique photos always gives a better result.
Ask family members or friends to send their favourite photos — collecting shots from multiple people adds variety and makes the mosaic more meaningful.

03

Keep colour match strength between 10–50%

Colour match strength controls how aggressively the app shifts tile colours to match the region they’re placed in.
Too low (0–5%) and the tile colours feel random — the main image is less readable from a distance.
Too high (60%+) and the tiles lose their natural look — the mosaic starts to feel artificial and over-processed.
Our recommended sweet spot: 10–50%. This gives the main image good readability while keeping the tile photos looking real and vivid.

Colour match strength

10 – 50%

Start at 25% and adjust to taste. If the main image looks washed out, nudge up. If tiles look unnatural, nudge down.

04

Set main image overlay to 50–80%

The main image overlay controls how strongly the main photo is blended over the tile grid.
Too low and the main image is hard to read from a distance — it looks like a random arrangement of tiles.
Too high and the individual tile photos disappear — you lose the mosaic effect entirely.
The sweet spot is 50–80%. This keeps the main image clearly readable while letting each tile photo show through.

Main image overlay

50 – 80%

Try 65% as a starting point. If the portrait is hard to read from arm’s length, go higher. If the tiles feel hidden, go lower.

05

Compose your main image with the subject's face taking up ~40% of the frame

The main image works best when there’s room around the subject — the background context adds depth to the mosaic.
If the face is too close (filling 70%+ of the frame), the mosaic loses tonal variety and the background tiles become monotonous.
If the face is too small (under 20%), the portrait loses its impact from a distance.
Aim for the face to take up roughly 40% of the total photo area — close enough to be the clear subject, but with enough background to give the tile grid something to work with.
Portraits with natural backgrounds (outdoor light, soft-lit rooms) work beautifully. Avoid strong flash or heavily blown-out backgrounds.

Quick check: cover the face in your main photo.

Does the background still have tonal variety — lights, darks, colours? If yes, the mosaic will be rich. If the background is a flat white or grey wall, consider a different photo.

06

For the face/body region: add 5–10% extra overlay intensity

The main image overlay setting applies globally to the whole mosaic. But the face or main subject of the portrait needs a little more definition to stay readable.
Set the overlay intensity for the face/body region to be 5–10 points higher than the overall main image overlay setting.
For example: if your main image overlay is 65%, set the face region overlay to 70–75%.
This keeps the subject clearly visible from a distance while the surrounding tiles (background, clothing, environment) retain more of their natural tile look.
The result is a mosaic that draws the eye to the subject while remaining rich and detailed in the areas around them.

Overall main image overlay	Face / body region overlay	Effect
50%	55–60%	Subtle — tiles very visible, portrait slightly soft from distance
65%	70–75%	Balanced — recommended for most portraits and gifts
75%	80–85%	Strong — portrait very readable, tiles more subtle

07

For tile photos: aim for minimal large white areas

Tiles that are mostly white or near-white add very little colour to the mosaic — they create distracting pale patches, especially in darker regions of the main image.
Ideally, each tile has a clear subject with colour and contrast. But don’t worry if some tiles aren’t perfect — you can fix them in Step 4 (Preview).
Crop the tile: if a photo has a large white sky or blank wall, adjust the crop to show more of the colourful subject.
Swap the tile: if a specific tile is landing in the wrong spot or clashing with the composition, you can swap it out entirely.
Remove the tile: if a photo just isn’t working as a tile — too dark, too white, too blurry — remove it from the set.
The app auto-crops all tiles to square. If a non-square photo is cropping badly (cutting off faces), use the crop adjustment tool to fix it.

Spend 5 minutes in Step 4 reviewing your tiles.

Most people click through quickly — but a short review of the tile grid, removing or swapping 10–15 problem tiles, can noticeably transform the final result.

Recommended settings at a glance

Setting	Recommended range	Notes
Colour match strength	10 – 50%	Start at 25%. Too high = unnatural look.
Main image overlay	50 – 80%	Start at 65%. Adjust for portrait clarity.
Face / body overlay	+5 to +10 above global	Keeps subject readable without hiding tiles.
Tile photos	300 – 500 unique	100 is minimum; more = richer mosaic.
Main image composition	Face ~40% of frame	Leave room for background context.
Tile shape	Square ideal	App auto-crops; you can adjust any crop.
White tile areas	Minimise	Crop, swap, or remove problem tiles in Step 4.

Frequently asked questions

What is colour match strength in the photo mosaic app?

Colour match strength controls how much the app shifts the colour of each tile to match the region of the main image it’s placed in. A low setting keeps tiles looking natural; a high setting makes the main image more readable but can make tiles look artificially tinted. We recommend 10–50% for the best balance.

What should I set the main image overlay to?

The main image overlay blends the main photo over the tile grid, making the portrait readable from a distance. We recommend 50–80%. Start at 65% — if the portrait looks too soft from arm’s length, nudge it up; if the tile photos are disappearing, bring it down.

How many photos do I need for a good mosaic?

The minimum is 100 tile photos, but 300–500 gives a noticeably richer result. The more unique tile photos you have, the fewer repeated tiles appear in the grid. The app automatically duplicates tiles if you have fewer than the minimum, but variety always produces a better mosaic.

Do my tile photos need to be square?

Not necessarily — the app automatically crops all tile photos to square. But if you can provide square photos, they fill the grid most naturally with no cropping needed. You can also manually adjust the crop of any individual tile in Step 4 (Preview).

What photos work best for the main image?

A well-lit portrait with strong contrast and a simple composition. The subject’s face should take up roughly 40% of the frame — leaving background context on all sides. Avoid plain white or grey backgrounds; natural settings or soft indoor light produce the richest mosaic. High resolution is better, but most phone camera shots work perfectly.

Why do some tiles look too white or pale in my mosaic?

White or near-white tiles add very little colour to the mosaic and create pale patches. In Step 4 (Preview), you can crop the tile to show a more colourful part of the photo, swap it for a different photo, or remove it from the tile set entirely. A 5-minute review of the tile grid before ordering makes a significant difference.

Is the mosaic builder better on desktop or mobile?

Desktop gives a much better experience. The tile grid, drag-and-drop tools, and preview panel are all designed for a larger screen. Mobile will open the app and let you create a mosaic, but for the best creating experience — especially if you’re uploading many photos or reviewing tiles carefully — use a desktop or laptop computer.

Tips