About
Hei.io is a comprehensive AI video localization platform designed to help content creators and businesses expand their global reach without the complexity or cost of traditional dubbing workflows. The tool delivers automatic caption generation, AI-powered dubbing, and voice cloning across 140+ languages, making it one of the most feature-rich solutions for multilingual video production. At its core, Hei.io provides approximately 90% accurate auto-transcription and translation, eliminating the need for manual captioning and timing synchronization. Users can upload audio or video files from their computer or via a YouTube link, select source and target languages, and receive auto-generated captions and translations in minutes. With over 440 naturally sounding AI voices across 140+ languages, creators can produce professional-quality voiceovers without hiring voice talent. The standout Voice Cloning feature preserves the essence of a speaker's original voice when translating content into up to 32 supported languages — including English, Spanish, French, German, Chinese, Japanese, Arabic, and more. Hei.io also supports SRT/VTT subtitle file uploads and custom dictionaries for improved transcription accuracy. Finished projects can be exported as MP4, MP3, or SRT files. A Lip Sync feature is currently in development to automatically align audio and visuals for an even more polished result. The platform is ideal for YouTube creators, marketing teams, e-learning providers, and global businesses looking to efficiently localize video content, reduce production costs, and connect with audiences across more than 140 languages.
Key Features
- AI Video Dubbing in 140+ Languages: Automatically dub your videos into 140+ languages using natural-sounding AI voices, removing the need for human voice talent.
- Voice Cloning: Preserve your original speaker's voice characteristics when translating content into up to 32 supported languages for a more authentic dubbing experience.
- Auto Captions & Subtitles: Automatically generate synchronized captions and translated subtitles with ~90% accuracy, eliminating manual transcription and timing work.
- 440+ Natural AI Voices: Choose from a library of over 440 naturally sounding AI voices across 140+ languages to customize the dubbing output for any audience.
- Multi-Format Export: Export finished projects in MP4, MP3, or SRT formats, with the ability to edit and re-dub as needed before final download.
Use Cases
- YouTube creators dubbing and captioning videos to reach international audiences in 140+ languages
- E-learning platforms translating course videos and adding subtitles for multilingual student bases
- Marketing teams localizing promotional and advertising videos for global campaigns without hiring voice actors
- Businesses producing multilingual internal training, onboarding, or product demo videos at scale
- Podcasters and media producers adding auto-generated captions and translated transcripts to audio and video content
Pros
- Extensive Language Coverage: Supports 140+ languages for dubbing and subtitles, enabling truly global content localization from a single platform.
- Realistic Voice Cloning: The voice cloning feature allows creators to maintain their original voice across translations, producing more authentic and engaging localized content.
- Fast, Automated Workflow: From upload to dubbed export in just a few steps — auto-captioning, translation, and sync are all handled automatically, saving significant time.
- YouTube Link Support: Users can paste a YouTube URL directly instead of downloading and re-uploading files, streamlining the workflow for online video creators.
Cons
- Lip Sync Still in Development: The automatic lip sync feature is listed as 'coming soon,' meaning dubbed videos may show visible mismatch between audio and lip movements.
- Voice Cloning Language Limit: Voice cloning is only available in 32 of the 140+ supported languages, limiting its use for less common target languages.
- Processing Time Varies: Longer videos take more time to process, which may be a bottleneck for users working with lengthy or high-volume content.
Frequently Asked Questions
How many languages does Hei.io support?
Hei.io supports 140+ languages for AI dubbing and subtitle generation. Voice cloning is available in up to 32 of those languages, including English, Spanish, French, German, Chinese, Japanese, Arabic, and more.
Can I use my own voice for dubbing?
Yes. The Voice Cloning feature captures the essence of your original voice and applies it when dubbing your content into supported languages, resulting in a more personal and authentic output.
What file formats can I upload?
You can upload audio or video files directly from your computer or provide a YouTube link. SRT and VTT subtitle files are also supported for better transcription accuracy.
What export formats does Hei.io support?
Completed projects can be exported as MP4 (video), MP3 (audio), or SRT (subtitle) files. You can also edit and re-dub the content before exporting.
Is there a free trial available?
Yes, Hei.io offers a free trial so users can test the platform's captioning and dubbing features before committing to a paid plan.
