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AI upscale to 4K: 15 credits, and it keeps your picture
Upscaling keeps the composition; regenerating at 4K makes a different picture. Both run on the same image, the cheapest route to a large print, and what 4K measures in centimetres.
Upscaling to 4K on aikizi costs 15 credits and keeps the picture you already have. Generating a new 4K image costs 24 and gives you a different picture — different composition, different light, different arrangement. If you like what you are looking at, there is only one correct choice, and it is the cheaper one. We ran both on the same image to show what that means.
Upscale against regenerate, on one picture
Put the two side by side and nothing has moved. What arrived is material: the lay of each rope coil, the mesh of the net, the flaking along the hull's waterline, the grain of wet sand. That is the whole proposition — you are buying detail inside a picture you already approved, not another roll of the dice.
| Upscale · 15 credits | New 4K · 24 credits | |
|---|---|---|
| Composition | Identical | Rebuilt from scratch |
| Lighting | The same shaft, the same dust in it | No shaft; flatter ambient light |
| Detail gained | Real: stone grit, petal edges, brass turning | Real, and slightly finer |
| Risk | None — you keep the original too | You may not like it. That is 24 credits. |
The upscaler is not generating a picture. It enlarges one and invents plausible detail inside shapes that already exist, which is why nothing moves. Part 8 sets both results side by side at full size and works through when each is the right call.
The cheapest route to a large picture
- Draft small until the composition is one you would keep — 1K at 8 credits, or 2 credits on Nano Banana 2 Lite.
- Look for errors before spending more: hands, text, reflections, anything with a countable number of parts.
- If there is an error, change the words and generate again. Never upscale a mistake — the upscaler renders it beautifully.
- When it is right, upscale for 15 credits.
That is 23 credits for a large picture you chose, against 24 for one roll of the dice at 4K.
How big is 4K, really
| Size | Long edge | Printed at 300 dpi |
|---|---|---|
| 1K | 1024 px | 8.7 cm — small for a postcard |
| 2K | 2048 px | 17.3 cm — a book page |
| 4K | 4096 px | 34.7 cm — roughly A3, framed |
On a screen you are over-supplied well before 4K: a full-width image on a laptop is about 1400 pixels across, a phone less. 4K earns its price for print, for crops, and for pictures whose subject is a surface — stone, metal, fabric, skin — where the invented detail has something to attach to.
FAQ
How much does it cost to upscale to 4K?
15 credits on aikizi, using the Leonardo upscaler, on a picture you already have. Generating a fresh 4K image on Nano Banana Pro costs 24, and on Nano Banana 2 it is 12.
How large can I print a 4K image?
About 34 cm on the long edge at 300 dpi, so roughly A3 framed. 2K gives about 17 cm, a book page, and 1K under 9 cm, which is small even for a postcard.
Does upscaling add real detail or just make the file bigger?
Real detail, invented inside the shapes already there — stone grit, petal edges, the turning on metal. It lands convincingly when the subject is a surface, and adds little to a plain shape against a plain sky.
What size should I upscale from?
From whatever size you settled the composition at, usually 1K. The upscaler works on shapes already in the picture, so it does not need a large source — it needs a source you actually like.
Is there a free way to upscale to 4K?
Not here. The upscale is 15 credits, about 5.5 cents on the $20 plan. Plenty of tools advertise free upscaling; what you pay for here is that it runs on a picture already in your library and keeps its composition.
The upscale sits on any picture in your library in the Studio. The longer comparison with both results at full size is part 8 of the generation series, and what each size is actually for is part 3.