Fixing Garbled Korean Text in AI Ads — a 3-Step Procedure

ImageFactory Engineering · Published 2026-06-12

Garbled Korean in AI ad images isn't fixed by prompt tricks that lower the odds — it's fixed by a structure that never redraws the text. Models draw glyphs as visual patterns, and Korean's 11,172 composed syllables make stable rendering impossible to promise (the full mechanics are in our detailed report). The working procedure is three steps.

Step 1 — If you must generate text, three rules

  • Keep copy to 1–3 words and put the exact phrase in quotes in the prompt
  • Use a current model with proven Korean rendering (Gemini Nano Banana family, etc.) and generate 2–3 candidates, pick a clean one
  • Never generate prices, brand names or legal copy — generate text-free and overlay in an editor

Step 2 — Adapt sizes by preservation

Adapt from one approved master, keeping text and logo pixels untouched while AI rebuilds only the background. Thirty sizes via regeneration means thirty chances to break; preservation has no breakage path at all.

RegenerationMasterSALE 30%regenerateper size →SALE 30%SAIE 3O%SALE 30%SLAE 30%… N chances to breakPreservationMasterSALE 30%preserve text,rebuild background →SALE 30%SALE 30%SALE 30%SALE 30%… original intact
Regenerating per size multiplies the chances of garbled text by the number of sizes. Preservation never redraws the text, so there is no path to breakage

Step 3 — Review in this order

  1. Brand name → 2. Numbers (price, discount) → 3. Legal copy → 4. body copy — ordered by the cost of being wrong. Korean review should be done by a Korean speaker, glyph by glyph, zoomed in.

How ImageFactory solves this

Step 2 is what ImageFactory banner resize does. Upload a master and it fans out to 1,400+ placements with text, logos and products kept as original pixels and only the background rebuilt — identical behavior across 15 languages including Korean. Verify with your own creative on the 14-day free trial.

Frequently asked questions

Can garbled Korean be prevented completely?

Not at the generation stage — only made less likely. The complete fix is structural: preserve the original text pixels and have AI rebuild only the background, so the text is never redrawn.

Can I fix an image that already has broken text?

The reliable path is to erase the broken text area and overlay correct text in an editor. Asking AI to redraw the broken glyphs can garble them again.

Is English copy safe?

Much more stable than Korean, but long phrases and small type still produce typos. For text that must be exact — prices, brand names — use preservation regardless of language.

See distortion-free size adaptation on your own creative

Upload one master creative and it is adapted to 1,400+ placement sizes automatically — original text preserved, safe zones and file specs applied per platform guide. Start with a 14-day free trial.

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