Approximate, not pixel-perfect
Naver and Kakao display search results with their own layout and truncation rules, and neither publishes an exact character limit the way Google's guidelines loosely do. This preview uses commonly observed approximate truncation lengths for each platform's title and description, so you can sanity-check how a title or description reads before it gets cut off - but treat the exact cutoff point as an estimate, since actual rendering depends on pixel width, font, and device rather than a fixed character count.
Why Naver and Kakao need their own preview separate from Google's
Naver and Kakao are the dominant search and messaging platforms in South Korea, each with their own result layout, font rendering, and truncation behavior distinct from Google's - a title or description tuned and checked against Google's preview conventions can still get cut off differently on either Korean platform, which is why targeting Korean search traffic specifically benefits from checking against their own layouts rather than assuming Google's preview applies everywhere.
Why no platform publishes an exact character limit for truncation
Search result snippets actually truncate based on pixel width, not character count - a title full of wide characters truncates sooner than one with the exact same character count but narrower letters. Since pixel width varies by font and device, no platform can publish a single exact character number that would hold true in every case, which is why every SERP preview tool, for any platform, works from an approximation rather than an exact published rule.
Why checking the real search result after indexing still matters
Even a close approximation can't account for every variable - the actual device, font rendering, and any layout changes a platform makes over time - so while this preview is useful for catching an obviously too-long title or description before publishing, confirming how a page actually renders once Naver or Kakao has indexed it remains the more reliable final check.