Run MT pre-translation with a fallback engine on untranslated strings via the Crowdin API
domain: support.crowdin.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm a machine translation engine is connected to the project/organization and note its engineId
POST to the pre-translation endpoint with method set to 'mt', the engineId, and target language IDs to translate
Optionally scope the request with fileIds/languageIds and set approval/replacement behavior (e.g., only fill untranslated segments, don't overwrite approved ones)
Poll the returned pre-translation operation until it finishes, since pre-translation runs asynchronously
Combine with a 'tm' (translation memory) pass first and 'mt' as the fallback for strings TM couldn't fill, to minimize unnecessary MT spend
Known gotchas
Pre-translation is asynchronous and can take a while on large projects — the initial API call only returns an operation reference, not translated content
Running MT pre-translation with default settings can overwrite existing unapproved translations; explicitly set the replace/approve behavior flags to avoid clobbering human work
MT engine availability and language coverage depends on which engine is connected at the org level — not every engine supports every language pair the project targets
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