Free AI Lip Sync Video Generator Online

AI lip sync is a video technique that uses machine learning to match a speaker's mouth movements to an audio track. The model splits the audio into phonemes, maps each sound to a mouth shape, and re-renders the face frame by frame, so new or translated speech looks naturally spoken.

Yes. The Free plan includes 1 to 3 videos (varies by region), up to one minute each, with 720p sharing and a HeyGen watermark, and no credit card is required. Paid plans remove the watermark, allow 30 or 60 minutes per video, and add 1080p and 4K export.

Upload a video or photo, then add the new audio as an MP3 or WAV file, or type a script and pick an AI voice. Choose Speed or Precision mode and generate. HeyGen re-renders the mouth to match and returns an MP4 you can preview and download within minutes.

Many lip sync tools only match a mouth to audio you already have. HeyGen can also create that audio from a script, your cloned voice, or a translation into 175+ languages, then sync it in the same job. Speed and Precision modes let you match the cost to how difficult the footage is.

Yes, for most footage. Results are cleanest when the speaker faces within about 45 degrees of the camera, stands within 10 feet, and is evenly lit. For side profiles, speaker switches, or hands and microphones near the mouth, use Precision mode, which is built for that footage.

Both run the same lip sync engine. Speed costs 6 credits per minute and suits front-facing footage with one speaker. Precision costs 10 credits per minute and handles side profiles, camera-angle changes, speaker switches, and objects in front of the mouth. Start with Speed and switch if the sync drifts.

Yes. When you upload your own audio, the lip sync engine maps mouth shapes to sounds rather than words, so any language, dialect, or accent works. If you type a script instead, AI voices cover 175+ languages and dialects.

Length depends on your plan, from one minute on Free to 30 minutes on Creator and Pro, 60 minutes on Business, and 5 hours on Enterprise. Videos export as MP4 in 16:9, 9:16, or 1:1, so they fit TikTok, Reels, Shorts, and YouTube, at up to 4K on Pro and above. Add synced captions with the subtitle generator.

With AI dubbing, HeyGen transcribes the speech, translates it, and regenerates it in the speaker's own voice. Dynamic Duration stretches or compresses each line by up to 20% to fit the original timing, then the lips are re-rendered to the new words. Würth Group shipped a 65-minute presentation in eight languages in four days and cut translation costs by 80%.

Yes. Clone your voice from a 15-second sample and use it on any script, in any language. Voice cloning requires consent from the voice owner. Uploaded footage is hosted on AWS in the US, never shared with third-party vendors, and covered by HeyGen's GDPR commitment and Data Processing Addendum.

Video can be MP4, MOV, or WEBM, from 2 seconds long and up to 5 GB, or a YouTube or Google Drive link. Audio can be MP3 or WAV. You can also skip the audio file and type a script for an AI voice or your cloned voice.

Yes. Precision mode detects speaker switches and syncs every visible face in the scene, not only the main speaker. It holds sync through camera-angle changes, side profiles, and hands or microphones in front of the mouth, so interviews, panels, and dialogue scenes stay aligned.

Yes. A clip from Veo or another video generator is treated like any upload, and if a face is visible HeyGen re-syncs the mouth to your audio. For still characters, Avatar IV animates cartoon, 3D, and stylized faces. Heavily stylized features can reduce mouth accuracy, so test a short clip first.

Yes. Upload one portrait plus an audio file or script, and the face animates with matched lip movement, head motion, and expression. Avatar V is tuned for real people, so a headshot becomes a talking or singing video. Faces close to human proportions give the most accurate mouth shapes.

Clips under one minute render in two to five minutes. Longer videos and high-resolution exports take 10 to 20 minutes. A multilingual batch, one script in ten languages, finishes in roughly the time of a single render plus translation.

Yes. The Lip Sync API (POST /v3/lipsyncs) takes a video and an audio file and returns the synced MP4. Pricing is pay-as-you-go from $0.84 per minute on Speed or $1.74 per minute on Precision, with no subscription, and each batch call handles up to 100 videos.

Yes, on any paid plan. Lip-synced videos can run as ads, client deliverables, paid social, and published content. Avatar use follows the standard usage license included with your plan, and any video using a cloned voice needs the voice owner's consent.

Yes. Upload the dubbed MP3 or WAV as the new audio track, and HeyGen builds the mouth shapes from the sound itself, so a line dubbed into Spanish or Japanese syncs as cleanly as the original recording. Teams dubbing at volume can swap tracks through the Lip Sync API.

No download is needed. HeyGen runs in the browser on desktop, and there is a HeyGen mobile app. A free account is required so your projects, voices, and avatars are saved to your workspace.

Yes. Record the corrected line, place it in the original audio track, and upload the clip with the new track. HeyGen re-syncs the mouth to the changed wording, so the edit looks like it was filmed that way.