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First determine whether the problem is in the spoken audio or in the avatar’s visible mouth movement. If a word, accent, stress, pause, or speaking rate sounds wrong, adjust the script or voice and preview the audio. If the audio sounds right but the mouth looks out of time, inspect a rendered avatar scene: an audio-only preview cannot confirm lip-sync.
Diagnose the audio before the animation
Listen to the clip and identify what is actually wrong: the word itself, its pronunciation or emphasis, the speaking rate, a pause, or the visual timing of the avatar’s mouth. These are different problems and may need different fixes.
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- Speech problem: The audio contains the wrong word or pronunciation, unnatural stress, awkward pacing, or an unwanted pause. Work on the script, pronunciation, voice, or speech settings.
- Visual sync problem: The audio sounds right, but the avatar’s mouth appears early, late, or otherwise out of time. Review an animated scene rather than relying on an audio preview.
HeyGen says its audio preview lets creators review narration, pronunciation, pacing, and timing, but does not generate lip-sync animation, facial expressions, or avatar animation. A good-sounding audio preview is therefore not evidence that the visible performance is synchronized. HeyGen’s voice documentation explains this distinction.
Fix a word the avatar pronounces incorrectly
Use a pronunciation editor when the platform provides one
In Synthesia, select the word or phrase in the script, choose Pronunciation, enter a phonetic spelling or record yourself saying it, preview the alternatives, and save the version you want. This is intended for cases such as brand names, technical terms, and acronyms. Synthesia also documents workspace glossaries for reusing saved pronunciations. Reliability can vary by voice and language; if a saved correction does not take, regenerate the audio and listen again. See Synthesia’s script documentation.
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Try phonetic respelling if there is no dedicated control
D-ID says it has no built-in fine-tuning control for pronunciation. Its Help Center suggests respelling the script to guide the voice—for example, changing “read” to “reed” when the intended sound is the present-tense “reed.” This is a workaround, not a pronunciation editor. Check that the altered text still works for on-screen captions, translations, and later editing. D-ID’s article, “Can I control pronunciation in my video?”, was updated May 8, 2025.
Adjust pauses, pacing, or an awkward delivery
Make the script easier to speak
For misplaced pauses or unnatural pacing, HeyGen recommends adjusting punctuation, adding pause controls, splitting long sentences, and rewriting text in more natural spoken language. You can also change speed in Voice settings. Synthesia documents script pauses and voice-speed controls as well. Preview the changed audio to check that it sounds natural rather than merely faster or slower. See the HeyGen avatar and voice FAQ and Synthesia script documentation.
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Try another take when the words are already correct
Synthesia’s speech regeneration creates another take with the same script, language, voice, settings, and visuals while varying timing, intonation, rhythm, and emphasis. Because the voices are non-deterministic, regeneration can help when the wording is right but delivery sounds slightly awkward; it is not a guaranteed fix for a mispronounced word. Synthesia’s script documentation describes the workflow.
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HeyGen’s Voice Mirroring workflow accepts recorded or uploaded audio and mirrors delivery characteristics such as tone, pacing, and emotion onto a selected public voice. It is a delivery option, not a universal repair for a generated avatar’s mouth-timing defect. Details are in HeyGen’s Voice Mirror and Direct Voice guide.
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Check lip-sync in an animated scene before rendering the full video
- Preview the narration. In HeyGen, use the audio preview to check the words, pronunciation, pacing, and timing. If you change something that affects narration, generate a new audio preview.
- Fix speech issues first. Use the relevant pronunciation, script, pause, speed, or delivery controls, then listen to the updated audio.
- Preview the avatar scene. Inspect a rendered scene with avatar animation to assess mouth movement, expression, motion, timing, and pacing. Audio preview alone cannot show the visual result.
- Render the complete video when the scenes are acceptable. HeyGen says A-Roll scene changes require a re-render and consume credits, so check scenes individually before committing to the full render. Its avatar and voice FAQ describes this review sequence.
If the audio is correct but the avatar’s mouth still looks wrong, a phonetic spelling or pronunciation correction is unlikely to address the visual timing. Evaluate the rendered scene itself and avoid assuming that a change to the words has fixed the animation.
Which platform control fits the problem?
| Platform | Pronunciation control | Reusable corrections | Speech pacing and preview | How to check lip-sync |
|---|---|---|---|---|
| Synthesia | Dedicated Pronunciation workflow: enter phonetic spelling or record the word, preview alternatives, and save the preferred version. | Workspace glossary can apply saved pronunciations across a workspace. | Script pauses and voice-speed controls are documented; audio can be regenerated for another delivery take. | Inspect an animated scene; the cited script documentation describes pronunciation and speech controls, not a guarantee of sync. |
| D-ID | No built-in fine-tuning for pronunciation, according to D-ID; phonetic respelling is the suggested workaround. | Not stated in D-ID’s pronunciation help article. | Not stated in that article. | Not stated in that article. |
| HeyGen | The cited voice documentation describes voice controls and audio preview; it does not document a dedicated phonetic pronunciation editor. | Not stated in the cited voice documentation. | Audio preview supports review of narration, pronunciation, pacing, and timing; the FAQ documents punctuation, pause controls, shorter sentences, and speed settings. | Audio preview does not generate avatar animation; preview a rendered scene. A-Roll scene changes require a re-render and consume credits. |
These are documented workflow differences, not a ranking of pronunciation accuracy or lip-sync quality. Voice reliability varies by voice and language, so assess the voice and language you intend to use.
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What the technical explanation can—and cannot—tell you
HeyGen’s Avatar V technical report describes dedicated audio cross-attention modules designed to align speech content with visual articulation at the phoneme level. That explains a system design objective; it is not a user troubleshooting procedure or proof that every generated scene will be synchronized.
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