Neural Translation
Proprietary Transformer architecture; beats Google/Microsoft on 14/16 language pairs by BLEU. 90%+ accuracy on core pairs (DE/FR/JA/ZH/EN), post-editing only 15-30%.
Core Features
Why DeepL is the go-to choice for professional translation.
Document Translation (Pro)
Upload PDF/Word/PPTX → keeps original layout, tables, images, headers/footers. 50-page legal contract test: 95% layout fidelity, 98% terminology consistency.
Glossary + Formality
Custom glossaries (brand/technical terms), 1,000 entries on Starter. Formal/informal toggle across T/V languages (DE/FR/ES/JA/ZH/RU).
Developer API
Free 500K chars/mo, supports glossary, formality, async document translation. Full Python/Node/Java/Go SDKs, 100K+ developers.
CAT Tool Integration
Official plugins for Trados Studio / memoQ / Across / XTM Cloud. Translators get DeepL suggestions in their familiar environment, 40%+ faster pre-translation.
Privacy & Compliance
EU servers, ISO 27001, GDPR compliant. Pro texts are not stored or used for training. Enterprise supports full on-prem deployment (Docker/K8s) — data never leaves your network.
Pros & Cons at a Glance
Pros
- 90%+ accuracy on core pairs, post-editing only 15-30%
- Document translation preserves layout perfectly (tables/images/headers)
- Glossary + formality toggle keeps professional consistency
- API free 500K chars/mo, full SDKs, developer-friendly
- Deep CAT integration, translator's first choice
- EU servers + ISO 27001 + on-prem option, privacy-compliant
Cons
- Only 33 languages vs Google's 133+ (weak on rare languages)
- High-volume file translation needs Ultimate $69/mo
- No real-time voice / conversation translation
- Mobile app weaker than web
- Custom models still in beta (Ultimate only)
- Starter glossary limited to 1,000 entries
Pricing Plans (2026)
Free
$0
Free forever
- Web translator, 5,000 chars/query
- 3 non-editable files/mo
- Basic API 500K chars/mo
Pro Starter
$8.74
/mo (billed $104.88/yr)
- Unlimited text translation
- 10 editable files/mo
- Glossary (1,000) + formality
- API access + CAT plugins
Pro Advanced
$28.74
/mo (billed $344.88/yr)
- 100 editable files/mo
- Team management + SSO
- CAT tool integration
- Larger glossary
Best Use Cases
Legal contract translation
Keeps clause numbers/headers/tables; glossary locks legal terms
Tech doc localization
PDF/Word/PPTX keeps layout; API batch-processes manuals
Marketing localization
Formal/informal toggle, glossary keeps brand consistency
Developer integration
REST API + SDK, glossary + formality params, async docs
Pro translator workflow
Trados/memoQ plugins, 40%+ faster pre-translation, synced glossary
Data-sensitive enterprises
EU servers + ISO 27001, on-prem keeps data in-network