AI Lip Sync for Existing Video

AI lip sync helps creators apply an authorized replacement speech track to an existing video while keeping the original framing and performance around the edited mouth area. This page explains the video-and-audio workflow, the footage that makes a sensible first test, and the safety and credit states you will see before a job starts.

Sign-in is required before upload. A verified new account may receive 30 credits for Basic mode once, valid for seven days and limited to 15 seconds per promotional job. This is not anonymous AI lip sync and it is not an ongoing free plan. Production entitlements, formats, and providers still require validation.

What Video-to-Video AI Lip Sync Does

Video-to-video AI lip sync begins with moving footage, not a single photograph. You provide a source video containing a visible person and a separate audio track. The AI lip sync system analyzes the face over time and generates altered mouth movement intended to follow the audio. The rest of the shot should remain recognizable, but output can contain visual artifacts or timing errors.

AI lip sync is different from voice cloning. This product does not create a copy of someone’s voice. It expects you to provide audio you have the right to use. AI lip sync is also different from a complete translation service: it does not promise script translation, text-to-speech, speaker separation, or subtitle creation in the MVP.

The clearest AI lip sync use case is authorized dubbing. A creator can record a corrected line, a localization team can prepare a translated track, or a course team can update an approved lesson. The AI lip sync service does not clear copyrights, likeness rights, voice rights, music rights, or advertising permissions for any of those uses.

A Focused Workflow for Existing Footage

Choose a short source clip

Start AI lip sync with a single shot and one visible human speaker. The face should be large enough to read, the mouth should remain visible, and lighting should be stable. Avoid a first test with a montage, overlapping faces, severe motion blur, rapid zooms, or repeated cuts.

Front-facing or near-front-facing footage is a safer AI lip sync test than an extreme profile. Hands, microphones, hair, masks, food, and other objects can interrupt the visible mouth region. Facial hair, teeth, strong expressions, and quick turns may expose quality differences. These conditions are not automatically fixed by choosing High Fidelity.

Prepare replacement speech

Use clean, intelligible speech for AI lip sync. Remove unnecessary background music when you can, avoid overlapping voices, and keep the start and end of the spoken line close to the desired video window. The current workflow does not promise automatic vocal isolation or mixing.

If the audio and video differ substantially in duration, AI lip sync needs a defined length strategy. The MVP may expose only provider-tested options such as cutting the longer input, looping a short visual segment, or preserving the video with silence. No strategy should appear in the final interface until its output and billing behavior are verified.

Sign in and upload privately

AI lip sync upload begins only after authentication. The intended architecture uses private media storage, account-scoped object keys, and short-lived access for required processors. Anonymous visitors do not receive a presigned upload URL and cannot create a job.

“Private by default” does not mean no provider sees the file. Moderation, generation, infrastructure, and other necessary processors may receive limited access to perform the service. The final Privacy Policy must name the providers and state the verified retention and deletion rules.

Confirm authorization

Every AI lip sync job requires a specific rights statement. You must have permission for the video, the depicted person’s face or likeness, the voice and audio, any music or protected material, and the intended way you will use the output. Consent to film someone does not necessarily include consent to alter what they appear to say.

The AI lip sync rights checkbox must be unchecked by default and recorded by the server with the job. A client-side visual state alone is not enough. Attempts to bypass the statement, moderation, rate limits, payment checks, or account controls violate the service rules.

Wait for the safety decision

Before AI lip sync generation, the video enters a server-side explicit-content check. Only a verified PASS can continue. REVIEW and REJECT do not call the generation provider and do not consume generation credits. A timeout, rate limit, provider outage, parsing failure, unknown result, or invalid callback also remains blocked.

This fail-closed AI lip sync flow is intentionally visible. The interface should distinguish “Safety check queued,” “Checking video,” “Needs review,” “Rejected,” and “Safety service unavailable.” It should never replace all of those outcomes with a vague failure message.

Process and review the result

AI lip sync reserves the estimated credits when the job is submitted, before moderation calls an external provider. After a PASS, the job enters the generation queue and displays a job page. Processing time varies with clip duration, generation-mode selection, provider demand, and technical conditions. The service has no verified fixed-speed promise.

When AI lip sync succeeds, review the entire output. Check mouth timing, facial edges, teeth, beard detail, frames around occlusion, scene transitions, audio placement, and unintended changes. Do not publish consequential content merely because a provider returned a completed status.

AI Lip Sync for Common Creator Tasks

Correct a spoken line

An approved presenter video may contain an outdated product term or an audio mistake. AI lip sync can support a targeted correction when reshooting is impractical and the presenter has authorized the edit. Keep the replacement line close in pacing to the original visual performance.

AI lip sync does not guarantee that a radically longer sentence will look natural in the same time window. Large duration changes can produce rushed, slowed, looped, or clipped visual behavior depending on the selected mode. The final UI must explain the exact behavior before submission.

Localize creator and marketing video

A translated recording can make a video understandable in another market, but conventional dubbing leaves the mouth speaking the original language. AI lip sync can reduce that mismatch in an authorized localization pipeline. Human review remains important for translation quality, timing, cultural meaning, and disclosure.

The MVP AI lip sync flow works from provided audio. It does not claim automatic translation, voice replication, or legal clearance for a campaign. Teams should keep approved source and consent records outside the tool and validate each localized output before distribution.

Update a course or product walkthrough

Course creators often need to change one explanation without recreating the surrounding visual lesson. AI lip sync can be tested on a clean talking-head segment with a newly recorded line. Product teams can use the same approach for an authorized demo whose terminology has changed.

For AI lip sync tutorials and education, altered-media disclosure may still be appropriate or required. The output is not original evidence of what a speaker said. Keep the edited version separate from archival footage and avoid misleading viewers about the time or context of the statement.

Test dialogue for an authorized synthetic character

AI lip sync may work on some human-like generated characters, but the MVP does not promise support for animals or nonhuman faces. Stylized proportions, exaggerated expressions, unusual teeth, and frame-to-frame design changes can create artifacts. Start with a short test before committing credits to a longer sequence.

Basic AI Lip Sync

Basic AI lip sync is the lower-cost tier for straightforward short-form footage. It estimates one credit per output second. Promotional registration credits can be used only with Basic and expire seven days after grant. Each promotional job is limited to 15 seconds.

Choose Basic AI lip sync for a first test with one clearly visible speaker, a stable shot, and clean speech. It is not presented as the “best” tier, and it does not guarantee a particular resolution, processing speed, success rate, or lack of artifacts. Those claims require production evidence.

If the source is outside Basic AI lip sync limits, the product should stop with a useful explanation. It must not silently send the request to a costly complex-scene model. A new upload or explicitly priced future option is safer than an unexpected cost.

High Fidelity AI Lip Sync

High Fidelity AI lip sync is the higher-cost tier and estimates nine credits per output second. The current provider candidate is intended for work where facial presentation and source detail matter, but final capabilities remain subject to the technical spike and commercial approval.

Choose High Fidelity AI lip sync only when the additional credit rate fits the project. High Fidelity does not create rights, consent, or a safety exception. It also does not promise multiple active speakers, severe obstruction, extreme angles, any fixed output resolution, or any specific delivery time.

Basic and High Fidelity AI lip sync should be compared using the same authorized samples, with settings, test date, failures, and review criteria published. Until those materials exist, this site will not claim one tier is more accurate by a measured percentage.

Credit Examples

AI lip sync estimates help users understand the difference before generation. The ledger reserves credits at submission, consumes them once after provider success, and releases them after a blocked safety check or covered failure. The provider spike must verify any case where billed duration differs from the estimate.

Moderation REVIEW or REJECT is not an AI lip sync generation attempt and consumes no generation credits. If safety infrastructure is unavailable, the job stays blocked and the user can return later. This rule cannot be weakened to improve conversion.

Where AI Lip Sync Can Struggle

AI lip sync can struggle when the mouth is hidden for several frames, the face leaves the shot, or the speaker turns fully away. It may also struggle with very small faces, low-quality compression, motion blur, unusual frame rates, or edits that interrupt face tracking.

AI lip sync can produce inconsistent teeth, lip shape, facial hair, skin texture, or blending around the edited region. A result can look acceptable at normal size but reveal artifacts in a close crop. Review on the target device and platform rather than relying on a small preview.

AI lip sync is not currently promised for songs. Singing changes timing, sustained vowels, expression, and jaw motion. It is also not promised for multiple people speaking in the same shot. Those features require separate samples, routing, interface controls, and pricing.

AI lip sync may be unsuitable when a video is intended as evidence, an official statement, a political message, a public-safety announcement, or a sensitive personal communication. The AI Abuse Policy prohibits deceptive and unauthorized use even when a file passes automated moderation.

Safety Is Part of the Product Flow

An AI lip sync tool can change what a person appears to say. That makes authorization and context essential. The service prohibits non-consensual intimate content, sexual deepfakes, exploitation of minors, deceptive impersonation, fake endorsements, political manipulation, fraud, harassment, extortion, and rights infringement.

The safety model does not prove that an AI lip sync request is lawful. It classifies risk signals in the video and may make mistakes. Users must still obtain consent and comply with copyright, privacy, publicity, platform, employment, advertising, and synthetic-media rules.

Reports and appeals need operational routes before launch. Do not send suspected child sexual abuse material, passwords, card data, or unnecessary intimate media to support. Use only the approved reporting details in the final AI Abuse Policy.

AI Lip Sync Questions

Do I need an account for AI lip sync?

Yes. You can browse this page without signing in, but upload and generation require an account. A verified new user may receive 30 credits for Basic mode once, valid for seven days and restricted to 15 seconds per promotional job.

Can AI lip sync replace any language?

The workflow is driven by audio rather than a text-language selector, but production support must be validated. Clear speech and good source footage still matter. The service does not promise translation or pronunciation quality.

Can AI lip sync process multiple speakers?

Reliable multiple-speaker selection is outside the MVP promise. Use a clip with one clearly visible speaker. Do not assume that High Fidelity or a higher credit rate automatically supports a conversation scene.

Is AI lip sync suitable for singing?

Singing is not a launch promise. It requires dedicated testing across vocal style, sustained sounds, expressions, and music. Submit spoken dialogue for the initial workflow.

What happens if the safety check fails?

AI lip sync generation does not start. REVIEW, REJECT, and unavailable moderation remain blocked, use no generation credits, and should offer an appropriate replace-file, retry-later, or appeal action.

What happens if AI lip sync generation fails?

A covered provider failure with no usable output should release or restore reserved credits. Unsupported files, user cancellation after processing starts, or subjective dissatisfaction may not qualify. The final Refund Policy controls.

Are files deleted immediately?

Users should be able to delete eligible media, and the architecture targets short-term storage. The exact automatic retention and provider deletion rules are not frozen, so this page does not promise a deadline.

Can I use AI lip sync commercially?

The service does not grant any source or output rights. You need authorization for all media, people, voices, music, and intended uses. Written provider approval for this end-user SaaS is also pending, so no commercial-license claim is made.

Start with Footage You Can Evaluate

Choose a short, authorized shot with one visible speaker. Record clean replacement speech, sign in, compare Basic and High Fidelity credit estimates, and confirm the rights statement. AI lip sync starts only after the safety check passes.

Pricing v0, provider routing, accepted files, output limits, processing behavior, retention, and paid checkout remain subject to production validation.

AI Lip Sync Submission Checklist

AI lip sync begins with an authorized source video. AI lip sync requires the rights to the replacement audio. AI lip sync upload requires sign-in. AI lip sync generation cannot start anonymously. AI lip sync works best for a short, single-speaker evaluation. AI lip sync needs a mouth that remains visible.

AI lip sync compares Basic and High Fidelity estimates before submission. AI lip sync promotional use is Basic-only. AI lip sync promotional jobs are limited to 15 seconds. AI lip sync promotional credits expire after seven days. AI lip sync grants 30 registration credits only once. AI lip sync paid use follows the current pricing page.

AI lip sync checks the video before provider dispatch. AI lip sync sends only a PASS decision to generation. AI lip sync blocks REVIEW and REJECT decisions. AI lip sync blocks a moderation outage. AI lip sync safety blocks consume no generation credits. AI lip sync cannot treat an unknown decision as approval.

AI lip sync output needs frame-by-frame review. AI lip sync can show mouth, timing, texture, or blending artifacts. AI lip sync does not supply source-media rights. AI lip sync does not approve deceptive uses. AI lip sync reports and appeals must follow the published policy. AI lip sync should begin with the smallest clip that can answer the user's quality question.