General
What is Hedra?
What is Hedra?
Hedra is a generative AI platform that creates realistic talking avatar videos. Our APIs let you generate videos by combining a portrait image with audio - the AI handles lip sync, facial expressions, and natural head movement.
What can I build with Hedra?
What can I build with Hedra?
Common use cases include:
- Personalized marketing videos at scale
- E-learning and training content
- Social media content (TikTok, Reels, Shorts)
- Virtual assistants and chatbots with video
- Customer support video libraries
- Multi-language video localization
What's the difference between Character API and Live Avatar?
What's the difference between Character API and Live Avatar?
Character API generates pre-rendered videos - you upload assets and download a finished video file. Best for content creation workflows.Live Avatar provides real-time streaming - the avatar responds immediately to audio input via WebRTC. Best for interactive applications like chatbots or live experiences.
API & Technical
What image formats are supported?
What image formats are supported?
We support PNG, JPG, and WebP images. For best results, use clear frontal portraits with good lighting and a neutral expression. Minimum recommended size is 512x512 pixels.
What audio formats are supported?
What audio formats are supported?
MP3, WAV, and M4A are supported. Use clear speech audio without background music. Sample rates of 16kHz or higher are recommended.
How long can videos be?
How long can videos be?
Maximum video duration depends on your subscription plan. Standard plans support up to 60 seconds per request. Enterprise plans can accommodate longer durations.
What resolutions are available?
What resolutions are available?
Character-3 supports 540p and 720p output in three aspect ratios: 16:9 (landscape), 9:16 (portrait), and 1:1 (square).
How long does generation take?
How long does generation take?
Generation time varies based on video length and current demand. Typical videos complete in 1-5 minutes. You can poll the job status endpoint to check progress.
What are the rate limits?
What are the rate limits?
Rate limits depend on your subscription tier:
- Starter: 10 requests/minute
- Pro: 60 requests/minute
- Enterprise: Custom limits
Pricing & Billing
How does pricing work?
How does pricing work?
Hedra uses a credit-based system. Credits are consumed based on video duration, resolution, and model version. See our pricing page for details.
Do credits expire?
Do credits expire?
Credit expiration depends on your plan type. Check your account dashboard or contact support for specific terms.
What payment methods are accepted?
What payment methods are accepted?
We accept major credit cards through our billing portal. Enterprise customers can arrange invoicing and other payment methods.
Is there a free trial?
Is there a free trial?
Visit hedra.com/plans to see current trial offerings and pricing.
Character-2 Legacy
Should I use Character-2 or Character-3?
Should I use Character-2 or Character-3?
We recommend Character-3 for all new projects. It offers better quality, more features, and will continue to receive updates. Character-2 is maintained for existing integrations but will be deprecated.
How do I migrate from Character-2 to Character-3?
How do I migrate from Character-2 to Character-3?
The APIs are similar but have some differences. Review the Character-3 API reference and update your integration. The main changes are in the request/response formats and available options.
When will Character-2 be deprecated?
When will Character-2 be deprecated?
We’ll announce deprecation timelines in advance. Subscribe to our changelog and join Discord for updates.
Support
How do I get help?
How do I get help?
- Discord: Join our community for developer discussions
- Support: Submit a ticket at hedra.com/support
- Enterprise: Dedicated support channels for enterprise customers
Where can I report bugs or request features?
Where can I report bugs or request features?
For API issues, contact support. For general feedback and feature requests, join our Discord community.