How to Translate Videos into Another Language Using AI

Not long ago, translating a video into another language cost thousands of dollars and took weeks. You had to hire a translator, a voice actor, a sound engineer, and for lip synchronization, an entire studio. Today, neural networks do this in minutes: they transcribe speech, translate text, synthesize voice, and even synchronize lip movements. Let's explore how this works.

How AI Video Translation Works

The complete video translation pipeline consists of four stages, each handled by a separate neural network:

1. Transcription — Speech Recognition

The neural network listens to the audio track and converts speech to text. The leader in this field is Whisper from OpenAI.

Whisper is an open-source speech recognition model supporting over 90 languages. It accurately recognizes speech even in noisy conditions, adds punctuation, and segments text with timestamps.

Alternatives:

• AssemblyAI — A cloud service with high accuracy
• Deepgram — Fast transcription for business
• Google Speech-to-Text — Google's cloud model

2. Text Translation

The resulting text is translated into the target language. It's crucial not just to translate words but also to adapt phrase length to match the video's timing.

DeepL — One of the best translators, especially for European languages. It excels at preserving the original meaning and style.

GPT-4 / Claude — Language models translate with contextual understanding and can adapt phrase length:

Translate the following text from English to Russian.
These are video subtitles, so:
- Keep the approximate length of each phrase
- Use a conversational style
- Adapt idioms and cultural references for a Russian-speaking audience

[subtitle text with timestamps]

3. Voice Synthesis — Dubbing

The translated text is voiced by a neural network voice. Modern models can clone the original speaker's voice.

ElevenLabs — The leader in speech synthesis. Key features:

• Voice cloning from a sample (30 seconds of audio)
• Natural intonation and emotion
• Support for 29 languages
• API for automation

Other options:

• Microsoft Azure TTS — High-quality synthesis with many voices
• Google Cloud TTS — Reliable synthesis from Google
• Coqui TTS — Open-source model, runs locally

4. Lip Synchronization (Lip Sync)

The most impressive stage — the neural network alters the speaker's lip movements to match the new audio. The video looks as if the person is genuinely speaking another language.

HeyGen and Rask.ai are leaders in this technology.

HeyGen — Full-Cycle Video Translation

HeyGen offers a Video Translate function that automatically performs all four stages.

Step-by-Step Process

1. Register at heygen.com
2. Go to the Video Translate section
3. Upload a video (up to 5 minutes on the free plan)
4. Select the source and target languages
5. Enable the Lip Sync option for lip synchronization
6. Click Translate and wait for processing (usually 5–15 minutes)
7. Download the result or share a link

Supported Languages

HeyGen supports translation between 40+ languages, including Russian, English, Chinese, Japanese, Spanish, French, German, Portuguese, Arabic, Hindi, and many others.

Quality and Limitations

• Lip sync works best on close-ups with clear articulation
• Group scenes and distant shots are processed less effectively
• Background music is preserved but may change slightly
• The free plan allows translation of 1 video

Rask.ai — Professional Dubbing

Rask.ai specializes in translating and dubbing video content. Suitable for YouTube bloggers, online courses, and corporate videos.

Step-by-Step Process

1. Go to rask.ai
2. Create a project and upload a video
3. The service automatically transcribes the audio
4. Check and edit the transcription
5. Select the target translation language
6. Configure the voice (you can clone the original)
7. Enable lip sync (available on the Pro plan)
8. Start processing and download the result

Rask.ai Features

• Ability to edit the translation before dubbing
• Support for multi-speaker videos (recognizes multiple speakers)
• YouTube integration — automatic video import
• Voice Cloning — cloning the speaker's voice for natural dubbing
• Subtitle support (SRT/VTT)

Kapwing — Simple Online Tool

Kapwing offers video translation as part of its online video editor.

Step-by-Step Process

1. Open kapwing.com
2. Upload a video or paste a YouTube link
3. Go to the Translate section
4. Select the target language
5. Kapwing will create subtitles and (optionally) dubbed voiceover
6. Edit the result in the timeline
7. Export the video

Kapwing Pros

• Built-in video editor for final polishing
• Automatic subtitles in addition to voiceover
• Simple interface with no learning curve
• Free plan for short videos

Descript — Editing Video Through Text

Descript is a unique video editor where you work with video as a text document. Translation is one of its functions.

Step-by-Step Process

1. Install Descript (desktop application)
2. Import a video — Descript automatically creates a transcription
3. Edit the text (deleting words removes video segments)
4. Use the translation function to convert the text
5. Apply AI Voice to dub the translated text
6. Export the final video

When to Choose Descript

• When you need not only to translate but also to edit the video
• For podcasts and long interviews
• When translation accuracy is crucial (manual editing is available)

Step-by-Step Manual Translation Process

If you want maximum control over quality, assemble the pipeline yourself.

Step 1. Transcription via Whisper

pip install openai-whisper
whisper video.mp4 --model medium --language en --output_format srt

The result is a subtitle file video.srt with timestamps.

Step 2. Translation via GPT or DeepL

Upload the SRT file to ChatGPT:

Translate these subtitles from English to Russian.
Keep the SRT format with timestamps.
The length of translated phrases should roughly match the original.
Use a conversational style.

[contents of the SRT file]

Step 3. Voiceover via ElevenLabs

1. Go to elevenlabs.io
2. Select or clone a voice
3. Upload the translated text in fragments with timestamps
4. Generate audio for each fragment
5. Download the audio files

Step 4. Assembly in a Video Editor

1. Open the original video in any video editor (DaVinci Resolve, Premiere Pro, CapCut)
2. Remove or mute the original voice track
3. Place the translated audio fragments according to the timestamps
4. Adjust timing and volume
5. Export the final video

Price Comparison

Tips for High-Quality Translation

Video Preparation

• Use videos with clean audio (minimal background noise)
• A single speaker yields better results than a multi-person dialogue
• Shorter videos (up to 10 minutes) are processed with higher quality
• Clear speaker articulation improves lip sync

Translation Editing

• Always check the automatic translation before voiceover
• Adapt phrase length if it doesn't fit the timing
• Consider cultural context — jokes and references may not translate directly
• For technical terms, specify preferred translations

Final Check

• Watch the entire translated video before publishing
• Check audio and video synchronization
• Ensure subtitles (if added) don't obscure important visual elements
• Ask a native speaker of the target language to evaluate the result

Applications of AI Video Translation

YouTube Bloggers

Translate your content into English, Spanish, or Hindi and access a billion-strong audience. Many bloggers have increased views by 3–5 times by dubbing their videos.

Online Education

Translate courses and webinars for an international audience. One course can be monetized in multiple language markets.

Business

Corporate presentations, training videos, marketing materials — all can be quickly adapted for foreign offices and clients.

Content Marketing

Videos in multiple languages significantly expand reach and improve SEO in different regions.

Conclusion

AI video translation is one of the most impressive technologies of recent years. For quick results with lip sync, use HeyGen or Rask.ai. For maximum control — assemble a pipeline from Whisper, DeepL/GPT, and ElevenLabs. The quality is already high enough for publication, although a final human check is still necessary.

Start with a short video (1–2 minutes) on HeyGen's free plan to assess the quality. If the result meets your needs — scale it to all your content.