Translation
Free tierNeural translation across 132 languages with glossaries.
About this API
Document and string translation with automatic source detection, formality control, custom glossaries for brand terms, HTML and Markdown tag preservation, and batch endpoints tuned for localization pipelines.
Common use cases
Quickstart
Every Zephiel API uses the same base URL, the same key header, and the same error envelope.
curl -X GET "https://zephiel.com/api/v1/translation/translate" \
-H "X-Zephiel-Key: $ZEPHIEL_API_KEY" \
-H "Accept: application/json"Example response
{
"detected_source": "en",
"target": "fr",
"translations": [
{ "text": "Bienvenue sur la place de marche Zephiel." }
]
}/v1/translation/translateTranslate one or many strings/v1/translation/documentsTranslate a whole document file/v1/translation/languagesSupported language pairsAll endpoints return JSON and accept the X-Zephiel-Key header. Rate limits are enforced per plan and reported in X-RateLimit-Remaining.
Plans can be changed or cancelled at any time. Overage is charged per 1,000 requests rather than hard-blocking your traffic.
Free
100 characters/mo
5 req/min
Free
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — not included
- Email support — not included
- Usage analytics and alerts — not included
- 99.9% uptime SLA — not included
- Webhooks — not included
- Priority support — not included
- Custom rate limits — not included
- 99.99% uptime SLA — not included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Starter
10,000 characters/mo
60 req/min
$21/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — not included
- Priority support — not included
- Custom rate limits — not included
- 99.99% uptime SLA — not included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Most popular
Pro
250,000 characters/mo
600 req/min
$84/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — included
- Priority support — included
- Custom rate limits — included
- 99.99% uptime SLA — included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Enterprise
Unlimited characters
Custom
$294/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — included
- Priority support — included
- Custom rate limits — included
- 99.99% uptime SLA — included
- Dedicated success manager — included
- SSO / SAML — included
- Custom SLA, DPA, and BAA — included
- Private deployment option — included
- Volume pricing — included
4.7
12 reviews
Carlos Mendez
Engineering Manager
Now handles support chat translation too
We adopted Translation for app localization and ended up using it for support chat translation as well. Same key, no new contract, no second integration.
Emeka Obi
Infrastructure Lead
Support answered properly
Asked Meridian AI about an edge case in Translation and got an explanation from someone who had clearly read the code, not a link to the FAQ.
Clara Nkemdirim
Engineering Lead
Quietly reliable
Translation has not surprised us once in eight months of production traffic. That is the highest compliment I can pay a dependency.
Daniel Kessler
CTO
One key made the difference
Adding Translation took ten minutes because the credential already existed. The vendor onboarding we skipped would have taken longer than the integration.
Elena Rossi
Product Manager
Solved App localization for us
We brought Translation in for App localization and it has not needed revisiting since. The response shape matched the documentation on the first call, which is rarer than it should be.
Hannah Lindqvist
Platform Lead
Predictable enough to plan around
Translation takes about 340ms, which is fine for the work it does. What matters is that the number barely moves — we queue the call and our timeouts have not fired once.
Sofia Almeida
Developer
Free tier covered the whole prototype
I built the entire catalog translation flow against Translation before anyone had to approve a purchase order. By the time we paid, we already knew it worked.
Samuel Adeniyi
Software Architect
Replaced a fragile in-house localization job
We had a script doing subtitle workflows that broke every few months and only one person understood. Translation replaced it in an afternoon and nobody maintains it now.
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