What 'good' looks like for caption translation across markets. The numbers are rough floors, better translation craft clears them by clear margins.
The top-5 language coverage rule is the highest-ROI starting point for any brand expanding internationally. English, Spanish, Portuguese, French and German cover ~70% of global social audience, and the marginal return on adding each language past the top-5 drops sharply. Most brands ship localised content to all 22 languages prematurely and dilute the quality across the long tail. Start with the top-5, run them well, then expand.
The localised-vs-literal engagement lift (+30-50%) is the entire case for caption-aware translation as a category. Google Translate and DeepL are engineered for accuracy, not voice, the output is correct and unusable for brand social copy. A caption-aware translator preserves the hook archetype and the emoji rhythm, and the engagement difference shows up immediately. For brands that take international expansion seriously, this is not optional.
The CPA reduction from localised ad copy (-18-30%) is the single most-measurable financial return of localisation. Paid social campaigns in non-English markets routinely see this lift; the campaigns that don't are running English copy because the team didn't get to translation in time. The 60-second-per-language hand-review investment is trivial compared to the CPA impact.
The localised-hashtag lift (4-6×) is the most-overlooked rule in translation workflow. English hashtags on a Spanish-language post under-reach by 4-6× compared to localised tags. Most brands translate the caption and forget the hashtags; the hashtags do most of the discovery work, and English hashtags on non-English posts are essentially invisible to non-English audiences. Always run a localised hashtag pass after translation.
The RTL handling matters when the target market includes Arabic, Hebrew, Persian or Urdu audiences. A translator that handles RTL renders correctly without manual adjustment; a translator that doesn't produces broken-looking output that reads as careless. The 4 RTL languages cover meaningful audience in Middle East, North Africa and parts of South Asia, worth the layout-awareness if those markets are in scope.
Beyond the floors above, the second-order translation decisions are where most brand-voice drift creeps in. Idioms rarely translate cleanly, 'spill the tea' in English is meaningless in most languages, and a literal translation reads as broken. The fix is to find the local equivalent, which a caption-aware translator does and a dictionary translator does not. The same logic applies to humour: a joke that lands in English often falls flat in German because the rhythm doesn't survive the syllable-count change. Hand-review catches these; auto-publish workflows do not.
The localisation-vs-fully-native-creation question comes up at scale. For most brands, localised English content out-performs fully native local creation on cost-per-result by 4-8×, one English source, five localised outputs is much cheaper than five fully-native creative teams. The exception is the top-1% of any market, where local-first creators win because they're embedded in the local conversation in ways that translation can't replicate. The pragmatic rule: localise for the long tail, hire local creators for the flagship campaigns.