By Mohammed Al Riyaz D · Published · Updated
Frequently asked questions
Twenty of the questions we get asked most often — from "what is a cube mosaic?" to "why did orange and red blend together?" — with practical answers from the team that built the generator. If your question isn't here, please get in touch and we'll add it.
What exactly is a Rubik's Cube mosaic?
A Rubik's Cube mosaic is a picture built out of many 3×3 Rubik's Cubes arranged in a grid. Each cube contributes a 3×3 patch of coloured stickers — nine "pixels" — and the entire artwork uses only the six colours found on a standard cube: white, yellow, red, orange, blue, and green. When you stand back, your eye blends the six colours into apparent shades of pink, brown, teal, and grey, the same way an old-fashioned newspaper photograph blends black-and-white dots into greys.
How is this different from just pixelating an image?
Two ways. First, the palette is fixed at six colours — you can't cheat by adding a pastel to smooth a gradient — which forces the generator to use perceptual colour matching and Floyd–Steinberg dithering to hide the banding. Second, the output is physical: each 3×3 tile has to correspond to a real Rubik's Cube face, which means generator also suggests a short move sequence from a solved cube. Because the search is depth-limited, the result may only partially match the target.
Do I need to know how to solve a Rubik's Cube?
No, not for the sticker-swap build method. If you peel and reapply stickers using replacement sheets, you're following a paint-by-numbers sheet — no cube knowledge required. If you prefer the solve-based method (turn each cube from a scramble into the target pattern using algorithms), you'll want to know standard beginner-method notation: U, D, L, R, F, B for the six face turns, a prime (') for counter-clockwise, and a 2 for a double turn.
How many cubes will I need?
Multiply cubes-wide by cubes-tall. A 12×12 mosaic is 144 cubes and fits on a desk; a 25×25 mosaic is 625 cubes and is about 1.5 m across; a 50×50 mosaic is 2,500 cubes and starts to be a serious wall installation. The generator shows the exact count once you upload an image. For budget planning see the buying guide.
Which cube brand should I buy in bulk?
Do not rely on a permanent brand ranking: models, batches and listings change. Buy a small sample, check the sticker type, measure it, and compare shades before placing a bulk order. Use the supplier-neutral buying checklist.
Stickered or stickerless?
Choose stickered cubes only if you intend to move or replace stickers. Stickerless cubes have moulded colour, so they require a turn-based method. The time difference depends on skill, target patterns and materials; test both methods on a small sample before committing.
What image works best?
High contrast, simple shapes, and a colour palette that already lives near the cube's six primaries. Portraits with strong side-lighting, brand logos on flat backgrounds, sunsets, comic-book panels, and iconic album covers all work well. Pastel photographs, busy landscapes, and anything with essential fine text tend to lose legibility at cube scale. The build guide has a full checklist.
What resolution should I choose?
A rule of thumb: the mosaic needs to be about twice as wide in cubes as your subject's smallest important feature in the source photo is, measured in image-widths. For a face where the eyes are about 1/10 of the frame wide, that means at least 20 cubes wide; compare several widths and use the smallest one where the important features remain separate in the preview.
What is Floyd–Steinberg dithering and why does it matter?
Dithering is a technique for approximating colours a palette doesn't contain by mixing the colours it does. Floyd–Steinberg is a specific 1976 algorithm that spreads the rounding error from one pixel into its neighbours in a fixed pattern, which produces the "grainy but photographic" look you see on old newspaper photos. In our tool it's what lets six cube colours pretend to be brown, teal, pink, or grey. Dithering and High fidelity are separate controls. Dithering is often useful for photographs and often unnecessary for flat logos; High fidelity gives extra weight to preserving luminance.
How long does a real build take?
Build time varies with method, materials, target complexity, experience and quality checks. Time a representative batch, include setup and error correction, then multiply that observed rate by your cube count.
Can I build a mosaic without gluing the cubes?
Yes, and we recommend it. Build a plywood grid with one cell per cube, back it with hardboard, and press-fit each cube into its cell — the friction plus a thin strip of foam tape at the bottom is enough to hold cubes vertically without adhesive. This lets you scramble the wall and rebuild a completely different picture on the same frame later, which is half the joy of the medium.
Is the tool free? Are there hidden limits?
The tool is free, with no account, no watermarks, and no export limit. There is no "pro" tier. The site is monetised by AdSense — contextual advertising you can see next to the generator — which is why we can afford to keep the tool free and off-the-shelf. See our privacy policy for how advertising cookies work.
Are my images uploaded to a server?
No. All image processing runs locally in your browser through the HTML Canvas API. You can verify this yourself by opening the Network tab in your browser's DevTools while generating a mosaic: you'll see the initial page load, then complete silence. The exported PDF and TXT files are also generated locally and offered as browser downloads.
Can I use my own custom palette?
Not yet. The generator is locked to the six standard cube colours so the output matches real hardware you can actually buy in bulk. Custom-palette support (for stickerless cubes with alternative colour schemes, or for people using coloured paper tiles instead of cubes) is on the roadmap.
Can I use the exported PDF commercially?
Yes, provided the source image is one you have the right to use. The mosaic patterns derived from your images belong to you; we don't claim any licence to your outputs. See the Terms of Service for the full framing.
The mosaic looks wrong — orange and red have blended together. What happened?
This usually means the source photo has warm mid-tones that sit exactly on the boundary between the cube's red and orange stickers in perceptual colour space. Try increasing the cubes-wide setting (more resolution gives dithering more room to separate the colours) or tweaking the source image's contrast slightly before uploading. If you're building a portrait, side-lighting the source subject harder is usually the single biggest quality improvement available.
Can the tool run offline?
Once the page has loaded once, everything except the ads runs entirely client-side, so temporary network drops during a session won't interrupt your mosaic generation. We don't currently ship a service worker for full offline installability, but adding one is on the roadmap.
What browsers are supported?
The current major versions of Chrome, Edge, Firefox, and Safari on both desktop and mobile. The tool relies on standard Canvas 2D APIs and doesn't need WebGL or WebAssembly, so it works on modest hardware — including Chromebooks and older iPads commonly used in classrooms.
I want to run a classroom workshop. Any tips?
Yes. Start smaller than you think — a 12×12 mosaic (144 cubes) is an achievable one-day project for a group of 8–12 students working in pairs. Print the PDF export ahead of time so students aren't tethered to screens during the build. And plan for at least 15% replacement stickers; the first few cubes are always sacrificial while everyone finds their rhythm. We'd love to hear how it goes — write in.
Where else can I read about cube mosaics?
The speedcubing community's forums (Speedsolving.com and the r/Cubers subreddit) have build threads with photos going back to the late 2000s. Pete Fecteau's Dream Big project from 2010 is the classic reference for portrait-scale work. And of course our own build guide, buying guide, and gallery collect what we've learned so far from making the tool.
Still stuck? The full build guide, the buying guide, and the gallery together cover most of what a first-time mosaic builder needs to know. Anything they don't cover, the contact page is the fastest way to reach us.