Nano Banana 2: Localize Poster Text, Keep Layout

The slowest part of cross-border creatives is rarely “draw another poster.” It is this: keep the same hero visual while swapping on-image headlines into English, Japanese, or Spanish without wrecking composition, color, or product placement. Manual retouching is slow. Full regenerations drift into a new campaign. Nano Banana 2 in-image text localization turns “translate only the visible copy; lock everything else” into a repeatable pipeline.

This guide is a creator workflow: lock a Chinese or English master → run a change-only localization prompt → batch market versions → QA spelling and brand names. It fits event posters, ecommerce selling points, storefront signs, and short ad heroes—not dumping a full legal disclaimer into one frame.

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What in-image text localization is (and is not)

In-image text localization means translating and re-rendering copy that already sits inside the artwork while preserving composition, subject, lighting, and hierarchy. Google positions precise text rendering plus in-image translation/localization as a core commercial capability of Nano Banana 2.

It is not:

• Regenerating a “similar vibe” poster from scratch (that is a redraw, not localization)
• Stuffing long addresses, ticket prices, and fine-print disclaimers into the AI text layer (overlay those later)
• Piling cultural stereotypes for a “local look”—official demos stress language only, no flags or clichés

One-line QA: line the language variants up as thumbnails—they should still read as the same ad, with only the words changing.

When to use Nano Banana 2 for in-image translation

Site-specific angle: split “master lock” from “language layer.” Lock the master once in our image tools, then run one localization prompt per market instead of reinventing taste for every language.

Before you generate: a five-line localizable brief

Write these five lines first; every nanobanana prompt reuses the same spine:

1. Master language + target markets — e.g. Simplified Chinese master → English, Japanese, Korean, Spanish
2. Must keep — product, palette, composition, logo reserve, people/props placement
3. May change — language of visible copy and natural line breaks only
4. Forbidden — no flags, ethnic stereotypes, extra promo badges, new logos
5. Copy budget — headline roughly ≤6 English content words or ≤12 Chinese characters; subhead ≤20 characters; fine print as overlay

Fact check: put English brand names, model codes, and event proper nouns on a do-not-translate list so the model does not “helpfully” rewrite them.

Step 1: Lock a short-copy, clear-hierarchy master poster

Most localization failures start with a wordy master. Generate or fix one Nano Banana 2 master first: short headline, strong contrast, clean title safe area.

Create a vertical 3:4 global campaign poster master: centered clean product pedestal with soft stage light, deep teal and amber palette, crisp top headline reading exactly "Summer Pop-up", subhead "This Week Only", bottom safe space for date overlay (do not invent messy date glyphs), commercial ad photography, high contrast, no watermark, no flags, no extra badges.

Master QA (30 seconds):

• Shrunk to a phone feed, is the headline still readable?
• Is the title zone large enough for longer English/Japanese strings?
• Are you keeping only one or two essential text layers?

If you already have a locked KV, upload it as reference and jump to Step 2 for in-image translation.

Step 2: Change-only in-image localization prompt (the core)

Do not re-describe the whole poster. State that only language may change. Put target strings in quotes to reduce freestyle rewriting.

Using the uploaded poster reference, localize in-image text: translate all visible copy into Japanese. Change the headline to "夏のポップアップ" and the subhead to "今週限定". ONLY translate the text — do not add cultural imagery, flags, national symbols, or stereotypes. Keep composition, subject, lighting, colors, layout, and every visual element identical. Do not add logos, reshape the product, or redraw the background.

Spanish example (same master, swap target strings only):

Localize in-image text only: change the headline to “Pop-up de verano” and the subhead to “Solo esta semana”. Do not add flags or cultural stereotypes. Keep composition, product, lighting, and colors identical.

Korean example:

업로드한 포스터 기준으로 이미지 내 텍스트만 한국어로 로컬라이즈하세요. 헤드라인은 「여름 팝업」, 서브는 「이번 주 한정」. 국기·스테레오타입 금지. 구도·제품·조명·색상은 그대로.

Step 3: Batch markets with a table

Do not invent prompts per market on the fly. Drive Nano Banana 2 from a sheet:

Each row = one generation: same master upload + Step 2 template with swapped language and quoted strings. Log the chosen asset ID back into the sheet for next week.

For multi-size flights, finish localization first, then conversationally change aspect ratio (“keep type and layout; expand to 16:9”) so language and crop do not drift together.

QA and common pitfalls

Always human-check before brand publish:

• Spelling — proper nouns, SKUs, prices
• Line breaks — ugly English hyphenation mid-word
• Drift — product angle, hands, logo reserve moved
• Over-localization — sneaky flags, maps, costume clichés
• Copy overload — long addresses, prices, legal lines → overlay later

Unlike review posts, takeaway here is one master lock + tabular language layer, not another pile of random prompts. For capability contrast, see the localization dimension in Nano Banana 2 vs GPT Image 2; for weekly shipping, stay on this workflow.

Wrap-up

Nano Banana 2 in-image text localization hits the real cross-border pain: one hero, many language layers, composition intact. Short master → change-only prompts per market → human type QA beats full redraws and looks more like native local ads than hard-masked overlays alone.

Start with the next multilingual poster you must ship: lock the master here, then paste the Step 2 prompt with your target strings.

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