Audio to video lip sync
Lip sync an existing video to your audio track.
When the new line already exists as audio — a re-record, a voiceover, or a track you own — upload it and match the mouth to it instead of reshooting.
Prepare your video and speech first. A free account is needed only when you generate.
Upload video and audioNeed another route? Compare all three speech inputs.
This approved A/B example uses typed lines, not uploaded audio. It shows a short single-speaker result; review your own full result before publishing.
Create
Bring one clear video. The matching speech mode is already selected.
You can switch modes at any time. The same price, consent, queue and result rules apply across all routes.
Use the finished take as-is. Start with your own video or try a ready-made sample.
MP4 / MOV · one clear face · current production limits applyNEW SPEECH
What should they say?
Type text, upload your own audio, or record. Try different lines anytime.A real Upload audio example
One video. Your audio file. A new lip-synced result.
We uploaded the original MP4 and a separate M4A file through Upload audio, then generated this new result. The presenter and Jordan voice are AI-generated and authorized for this example.
“Our next update arrives Friday.”
Generated 2026-10-26. This run finished in 81 seconds and charged 90 credits for 3 rounded seconds. The result is shorter than the source video. Processing time varies. Compare the speech, mouth movement and framing yourself; one short front-facing AI-presenter example does not establish quality for other footage.
Upload your video and audioInput guide
Make the uploaded track easy to match
Bring the approved video
Upload an MP4 or MOV with one clear, forward-facing speaker.
Upload the track
Add the MP3, WAV or M4A you own. Your track drives the result; review the finished audio, length and mouth alignment.
Generate, inspect, then publish
Check the mouth movement against the track in the finished MP4 before using it.
- Use a clean MP3, WAV or M4A with one speaker and no background music over the voice.
- Use one clearly visible speaker in the video. This tool changes mouth timing; it does not create a person.
- Only use footage and audio you have permission to process.
- Source video: 3 seconds to 5 minutes. Replacement speech must be longer than 1 second; its affordable length depends on your credit balance, not your plan.
- Upload audio costs 30 credits per second of new speech, rounded up to the next whole second. An 8-second track costs 240 credits. Review the exact quote before generating.
Questions
Audio to video lip sync questions
What audio formats work?
MP3, WAV and M4A. Use a clean single-speaker recording; music mixed over the voice makes the mouth timing less accurate.
How much does audio-to-video lip sync cost?
It costs 30 credits per second of replacement speech, rounded up to a whole second. An 8-second track costs 240 credits. The tool shows the exact quote and your available balance before you generate. Typed, uploaded and recorded speech use the same Lip Sync rate.
How long can my video and audio be?
The source video must be 3 seconds to 5 minutes. Replacement speech must be longer than 1 second, with its length limited by your available credits rather than a plan-based duration cap. Use video at least as long as the new speech to avoid looping a shorter clip.
Can I upload a track in another language?
Yes. The mouth is matched to the audio you supply, whatever language it is in. We do not translate or generate that audio for you.
Does the result keep the original audio?
No. The uploaded track replaces the speech in the result. Review the MP4 before publishing.