DeepL
German translation engine covering about 120 languages, with glossaries that inflect terms correctly, document translation and a streaming Voice API. API Free and API Pro retired in July 2026.
Overview
Cologne-based, employee-owned until its 2024 Series C, DeepL has spent a decade building translation models rather than general-purpose ones, and that focus still shows in European language pairs. The product now spans a web translator, desktop and mobile apps, browser extensions, DeepL Write for rephrasing, an agent released in November 2025 and a Voice line that went to real-time voice-to-voice in April 2026. Language coverage jumped to roughly 120 after the late-2025 expansion, closing part of the breadth gap to Google Translate, though Google still lists more than twice as many.
For engineers, the interesting surface is the API. Translate text or documents over REST, keep formatting on DOCX and PPTX, pin terminology with glossaries and get back terms that agree with the surrounding grammar. Official clients cover Python, Node, Java, .NET and PHP, and the tag-handling options let you protect code spans and XML markup instead of watching the model translate your parameter names. Formality control works on the languages that have a T-V distinction, which saves a review pass on German and Japanese docs.
Fit depends heavily on your language pairs. For an English to German or English to French docs pipeline with a locked glossary, it is still the default and the compliance story is easy. For English to Chinese, a general model with a good prompt and your own term list will usually beat it, so it is worth running both against a sample of your own text before committing. Budget carefully: the July 2026 plan change means anything you read about API Pro pricing before that date is wrong.
Key Features
- ✓ Glossaries that apply your terminology with correct inflection instead of find and replace
- ✓ Document endpoint for DOCX, PPTX, XLSX, PDF and HTML with formatting preserved
- ✓ REST API with maintained clients for Python, Node, Java, .NET and PHP
- ✓ DeepL Write for rephrasing and tone control, available as its own API
- ✓ Voice API for streaming transcription plus translation into up to five target languages, GA February 2026
- ✓ Around 120 languages after the 70-language expansion announced in November 2025
Where it holds
- • Output in German, French and Spanish still reads closer to publishable on the first pass than most general models
- • Glossary control is the cleanest of any translation API, which matters for product names and fixed technical terms
- • EU hosting, no training on Pro text and a signable DPA, so it clears most compliance reviews without argument
- • The free Developer allowance is enough to build and test a full integration
Where it breaks
- • Chinese, Japanese and Korean pairs lose to GPT-5 class models and Claude in independent 2026 BLEU comparisons
- • API plans were reshuffled in July 2026 and the old API Pro economics are gone, so older cost estimates are stale
- • The Developer allowance is one million characters total, not per month, so a batch job burns it in an afternoon
- • No self-hosting below enterprise contracts, your text goes to their servers
My Take
German and French come back close enough to shippable that a human pass becomes editing rather than rewriting. The glossary handling is the real engineering feature, since terms return inflected for case and number instead of pasted in raw, which is why localisation pipelines keep it around. Where it stops being the obvious pick is Chinese, Japanese and Korean, where 2026 benchmark work puts GPT-5 class models ahead. Watch the billing too: API Free and API Pro were withdrawn in July 2026 and the Developer tier's million characters is a lifetime allowance, not a monthly one.
Quick Info
- Pricing:
- freemium
- Openness:
- Proprietary
- Starting at:
- Web tier free at 50K characters a month. Individual $8.74 per user monthly on annual billing, Team $28.74, Business $57.49, Enterprise quoted. Write Pro is a $7.49 add-on on the lower tiers and included from Business up. The API was restructured in July 2026: API Free and API Pro can no longer be bought, replaced by Developer (1M characters as a one-time allowance, no charge) and Growth at roughly $26 a month with 12M characters a year and overage near $27.50 per million. DeepL localises prices, so check the live figure before budgeting.
- Added:
- Aug 2026
- Updated:
- Aug 2026
Use Cases
Judge it on your own work
The notes above say where DeepL holds and where it breaks. The fastest check is your own workload.
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