To use Wav2Lip online, upload one clear face video, add the new speech as audio or text, and generate. A stable close-up and clean speech make timing easiest to judge. FreeLipSync positions this page as a faster, accuracy-focused online workflow, but it is an independent service—not the original Wav2Lip project—and this page does not claim a head-to-head benchmark win without a same-input, same-hardware baseline.
What you need
- Video: one authorized speaker with a sharp, unobstructed mouth.
- Speech: uploaded audio, browser-recorded audio, or text with a preset or authorized cloned voice.
- Tool: Wav2Lip Online.
The test speaker is fictional and was created for this tutorial. Do not replace a real person's speech without permission, and disclose altered dialogue when viewers could mistake it for an authentic recording.
Exact source video
Original source line:
This is the original dialogue clip. The pace is steady, with clear pauses between each short phrase.
Exact consonant-and-pause input
Exact English audio used for the result
Bright blue paper bags pop beside the table. Please pause, breathe, and bring back the package before the bell. My best practice is to keep every pause clear and every consonant crisp.
The line deliberately repeats B, P, and M sounds because they require visible lip closure. It also includes pauses to expose unwanted mouth movement during silence.
Unedited result
This is the complete direct result with its generated audio. No manual mouth retiming or replacement was added after generation.
Open the dedicated video watch page
Step-by-step workflow
- Choose a stable face video — Keep one speaker visible, sharp, and mostly forward-facing.
- Open the tool — Upload the video or select the dedicated close-up sample.
- Choose Audio or Text — Audio accepts uploads or browser recording; Text uses an existing preset or authorized cloned voice.
- Generate without changing the test — Preserve source, input, and settings for repeatability.
- Review critical frames — Inspect lip closure on B/P/M, silence between phrases, identity, and clip boundaries.
Text mode and audio mode
Choose Audio when you already have the final speech performance and want its exact timing. Choose Text when the line is still changing or you need a voice from the existing language lists. Clean speech and short controlled tests make both paths easier to evaluate.
Free accepts up to 20 seconds of audio or 133 text code points. Starter Generate Pro accepts up to 3 minutes or 800 code points. Pro supports up to 60 minutes or 16,000 code points. Spending a Pro Video changes high-resolution eligibility, not these plan-specific input ceilings.
Reproducible speed and accuracy comparison method
Use the following method before making a comparative claim:
- Run the exact source video and exact 11-second audio displayed above through each implementation.
- Use the same machine class, region, network, output resolution, and warm-up policy.
- Record five completed runs per implementation. Report median submit-to-result time and every failed run.
- Preserve unedited outputs and inspect the same timestamps for B/P/M closure, silence, first frame, final frame, and identity stability.
- If automated sync metrics are added, publish the metric implementation, face-detection failures, and raw scores beside human review.
The current page supplies the FreeLipSync input and raw output needed for that protocol. It does not publish a measured comparison against the original Wav2Lip implementation yet, because an equivalent same-hardware baseline has not been completed. “Fast and accurate” here describes the product goal and test design, not a quantified superiority claim.
Inputs that improve accuracy
- Keep the mouth large enough to inspect but avoid an extreme crop.
- Prefer stable head motion and a continuous shot.
- Remove long leading silence and loud background music.
- Test stop consonants and pauses, not only vowels.
- Avoid hands, microphones, subtitles, or props covering the lower face.
Limits
The workflow retimes visible speech on an existing face video. It does not translate language, rewrite the script automatically, create scene motion, or guarantee realistic results when several speakers, cuts, occlusions, or strong profiles appear. If the new audio is much longer than the source, the visual motion beyond the source performance may feel repetitive.
Pricing is not per second or minute
Free generation deducts no Pro Video, and downloads are watermark-free subject to the free sign-in and resolution rules. Starter uses one Pro Video for one high-resolution result rather than charging duration credits. Active Pro subscribers have unlimited Pro Video generation entitlement.
The 2026 AI video pricing report calculates about $0.25 per effective output minute for Starter when all 20 included results average one minute. That figure is a normalized market comparison, not FreeLipSync's billing unit.
Troubleshooting
- Closed-mouth sounds stay open: use a sharper source and stronger, cleaner consonants.
- The mouth moves during pauses: remove background noise and trim ambiguous silence around the phrase.
- The face changes: reduce source motion, cuts, occlusion, and compression.
- The result feels slow to arrive: measure from submission to playable result over repeated runs; one run is not a reliable benchmark.
Questions people ask
Is this affiliated with the original Wav2Lip project?
No. FreeLipSync is an independent online service.
Can I type the replacement speech?
Yes. Switch to Text and choose a language-matched preset or authorized cloned voice.
Where is the accuracy benchmark?
The exact input, output, and reproducible method are published above. A head-to-head numeric claim should wait for an equivalent baseline under the same test conditions.
Run the test yourself
Use the dedicated source sample and exact transcript above, preserve the settings, and compare repeat runs rather than selecting one favorable output.
