Who this decision is for
- A product manager shipping a web app with an English-only codebase who needs to know what engineering must change for Korean users.
- A web developer given translated files and asked to publish a Korean version without breaking layouts.
- An ecommerce operations lead whose checkout uses fixed address and name fields designed for another country.
- A QA lead who has never tested Hangul input and wants a concrete list of things to verify.
The decision to make
The decision is how deep technical localization must go before the Korean version is credible. A quick language switch may display translated text but still fail on search, forms or payment steps. Deeper work means reworking fields, sorting, formats and copy limits so the product behaves as Korean users expect. The extent depends on whether Korean users will transact, submit data or only read.
Trade-offs are between speed to launch and long-term maintenance. Hard-coding Korean text into templates is quick but expensive when copy changes. Externalizing strings and adopting locale-aware formatting takes longer up front but supports updates. Engineering effort should follow the most valuable user journeys first: contact, sign-up and purchase. Payment, identity verification and legal notice requirements should be checked with Korean advisers and your providers, not assumed.
Options compared
| Option | Best when | Watch out for |
|---|---|---|
| Content-only localization | The Korean site is informational and visitors mainly read and then contact you. | Layout and font problems can still appear, and contact forms may reject Korean names or addresses. |
| Localized front end with shared back end | You need Korean forms, formats and UI while keeping one core system. | Data fields, sorting and emails may still assume Latin characters unless tested end to end. |
| Full locale-aware build | Korean users will register, pay, receive notifications and interact with support in the product. | It requires more engineering and testing time and depends on payment, verification and legal decisions outside marketing. |
Risks to manage
- Broken characters. Wrong encoding or missing font support turns Hangul into empty boxes or question marks. Use Unicode throughout and test in database, emails and exports.
- Ugly line breaks. Korean wraps differently from English and words can split badly in narrow buttons. Test long strings on mobile and use appropriate wrapping rules.
- Rejected input. Forms built for short Latin names or Western address structure may reject valid Korean entries. Test with real Korean names and addresses.
- Text expansion surprises. Korean strings can be shorter or longer than English, breaking fixed-width labels. Use flexible layouts and review every screen with real translated text.
Evidence to gather first
- A list of all user-facing surfaces: pages, forms, emails, notifications, PDFs, error messages and app screens, so nothing is left in English by accident.
- The technology stack and how strings are stored, which determines whether translation can be externalized or must be edited in code.
- Sample real Korean data: names, addresses, phone formats and long Hangul strings for testing.
- Analytics on which journeys matter most, so testing effort focuses on the paths that produce inquiries or purchases.
Recommended process
- Surface inventory. SWIN and your developers list every screen, template and message a Korean user might see, including error states and emails.
- Requirements review. We compare each surface against the checklist for encoding, fonts, wrapping, formats, fields and string handling.
- Fix planning. Issues are grouped by severity and by journey so developers can address blocking problems on contact, sign-up and purchase first.
- Real-text testing. Native testers run journeys on Korean phones and browsers using real Hangul, logging issues with screenshots.
- Regression handoff. A retest checklist is left with your team so future releases do not reintroduce Korean display or input problems.
What SWIN can deliver
- A completed Korean technical localization checklist with pass, fail and not-applicable marks per surface.
- A prioritized issue log with screenshots from Korean device testing.
- Guidance for externalizing strings and handling Korean date, number and address formats.
- A test script of Korean sample data for names, addresses and long text.
- A release regression checklist your developers can run before each update.