Crowdin API
Crowdin's REST API v2 provides programmatic access to translation and localization management including projects, files, translations, translation memory, glossaries, and integrations.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS enforced; PATs support scoping; OAuth for delegated access; GDPR and ISO 27001 certified
⚡ Reliability
Best When
Software teams managing ongoing localization at scale with multiple contributors and languages
Avoid When
You only need one-off translation and don't need workflow management or TM reuse
Use Cases
- • Automating upload of source strings to translation projects
- • Downloading translated files for release pipelines
- • Managing translation memory and glossary entries
- • Tracking translation progress across languages
- • Integrating localization workflows into CI/CD pipelines
Not For
- • Real-time machine translation (use DeepL or Google Translate instead)
- • Teams needing a free hosted plan beyond open-source projects
Interface
Authentication
Personal Access Tokens for direct use; OAuth 2.0 for third-party app integrations. Tokens are per-user.
Pricing
Open source projects can apply for free unlimited access; commercial projects require paid plans
Agent Metadata
Known Gotchas
- ⚠ File uploads require multipart form data, not JSON — agents must handle binary upload correctly
- ⚠ Translation approval and review states are separate from translation existence — check status carefully
- ⚠ Rate limits vary by plan and are not surfaced clearly in error responses
- ⚠ Branch/version management adds complexity to file addressing
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Crowdin API.
Scores are editorial opinions as of 2026-03-06.