What languages does the Lip Sync API support?

We currently support 29 languages including English, Spanish, French, German, Italian, Portuguese, Japanese, Korean, Mandarin Chinese, Hindi, Arabic, and more. Each language has custom-trained phoneme models for accurate lip-sync. Contact us if you need a language not on this list.

Can I use my own avatar images or videos?

Yes, the API accepts both static images and video clips as avatar inputs. For images, we generate natural head movement alongside lip-sync. For videos, we preserve original head motion while adjusting only the mouth region for seamless integration.

How accurate is the lip synchronization?

Our lip-sync achieves sub-frame accuracy (within 16ms) and has been rated as 'indistinguishable from real speech' by 94% of viewers in blind tests. The AI models individual phoneme transitions rather than just word-level sync, capturing the nuances that make speech look natural.

What's the maximum audio length supported?

Standard API calls support audio up to 10 minutes. For longer content like webinars or courses, use our batch processing endpoint which handles files up to 2 hours. Processing time scales linearly—a 60-minute video takes approximately 30 minutes to process.

August Ads

Built to improve CTR, CPC, and ROAS

Frame-Perfect Lip Synchronization at Scale Lip Sync API

Transform any audio into perfectly synchronized video with our AI-powered Lip Sync API. Upload an audio file and avatar, receive a video with natural mouth movements that match every syllable. Ideal for dubbing, localization, and dynamic video personalization.

Use Lip Sync API

Stop stressing over fresh creatives.

Build a repeatable system to keep your TikTok, Meta, and Shorts ads performing.

Winning ads don't last forever.

Creative fatigue is just part of the game. Keep your campaigns alive with a reliable flow of new hooks and visuals every single week.

Beat the rising costs.

When ad costs spike, slow iteration drains your budget. React instantly and swap out tired ads the second performance dips.

Ditch the guesswork.

Get out of the Ads Manager weeds. Rely on a clear-cut Keep / Kill / Replace workflow that tells you exactly what to create next.

Winning ads don't last forever.

Creative fatigue is just part of the game. Keep your campaigns alive with a reliable flow of new hooks and visuals every single week.

Beat the rising costs.

When ad costs spike, slow iteration drains your budget. React instantly and swap out tired ads the second performance dips.

Ditch the guesswork.

Get out of the Ads Manager weeds. Rely on a clear-cut Keep / Kill / Replace workflow that tells you exactly what to create next.

The Ultimate Creative Testing Loop.

See it in action

Watch how August Ads transforms a product link into scroll-stopping video ads in under 2 minutes.

Beat Ad Fatigue. Scale Winning Creatives.

Stop guessing what converts and stop waiting weeks for influencers. Generate endless variations of native, scroll-stopping video ads on autopilot—all from a single platform.

Ad Creation

Instant UGC Ads

Paste your product link and let our engine do the rest. August Ads instantly generates 5-10 native, ready-to-test UGC variations in seconds. Use 500+ hyper-realistic creators to deliver perfect hooks without the influencer management headache, shipping delays, or retakes.

UGC ad example with AI presenter on mobile

UGC ad creative example generated by August Ads

UGC ad variation generated by August Ads

Avatar Creation

Tireless Digital Creators

Build a custom brand ambassador or choose from our curated library. Our avatars emote, speak, and move with perfect lip-sync, giving you a dedicated content team that shoots 24/7. Perfect for rapid A/B testing different demographics and delivery styles.

Ad Creation

Cinematic Product B-Roll

Turn a single, flat product photo into dynamic, studio-quality video shots. Seamlessly mix these premium visuals into your UGC ads to elevate your brand perception while keeping production costs at absolute zero.

Product shot video frame generated from a product image

Product demo frame with AI-generated lighting

Research & Analysis

Viral Hook & Trend Analyzer

Never start from a blank page. Your AI strategist spies on competitor ad libraries, flags rising TikTok/Reels trends, and writes proven, psychological hooks tailored specifically to your product. Steal the winning formulas before your competitors do.

Closed Beta

Augustus Agent: Data-Driven Iteration

Plug in your Meta and TikTok ad accounts and let Augustus analyze the data. It sees exactly why an ad won or lost, then automatically surfaces high-intent angles, stronger hooks, and smarter scripts for your next test. Early beta users are reporting dramatically lower CPCs and higher ROAS by letting Augustus drive their creative strategy.

The Scale

2,000+

Creatives Generated Daily

Marketers are using August Ads right now to pump out rapid-fire variations and find their next winning hook.

The Proof

+50M

Views on August Ads

Our AI doesn't just make videos; it makes native, algorithm-friendly content that actually stops the scroll.

Founder-Level Support

You aren't dealing with a faceless support desk. Our team of performance marketers and builders are in the trenches with you to help you win faster.

The Lip Sync Problem Is Harder Than It Looks

Traditional lip-sync solutions produce robotic, uncanny results that immediately signal 'fake' to viewers. Getting natural-looking mouth movements requires modeling thousands of phoneme transitions, facial muscle movements, and timing subtleties. DIY approaches using open-source models result in glitchy outputs that damage brand perception rather than enhance it.

Open-source lip-sync models produce uncanny valley results that make videos look obviously fake

Frame-by-frame manual lip-sync editing takes hours per minute of video content

Audio-visual synchronization drift causes mouth movements to fall out of sync over time

Different languages have unique phoneme sets requiring specialized models for each

Real-time lip-sync for interactive applications requires specialized low-latency infrastructure

Natural Lip Sync That Viewers Trust

August Ads Lip Sync API uses proprietary neural networks trained on millions of hours of natural speech. Our models capture the subtle micro-expressions, timing variations, and phoneme transitions that make lip-sync feel authentic. The result: videos where viewers focus on your message, not the technology behind it.

Phoneme-Accurate Synchronization

Our AI models every phoneme transition in real speech. Mouth shapes match not just words but individual sounds, creating synchronization that passes the 'uncanny valley' test even on close-up shots.

Multi-Language Support

Native support for 29 languages with language-specific phoneme modeling. Create localized video content without reshooting—just provide translated audio and our API handles the rest.

Emotion Preservation

Lip-sync adjustments preserve and enhance emotional expression. Happy audio produces smiling mouth shapes; serious content maintains appropriate gravitas in facial movements.

Sub-Frame Accuracy

Synchronization accuracy within 1/60th of a second ensures zero perceptible drift even in long-form content. Your 30-minute webinar stays perfectly synced from start to finish.

How the Lip Sync API Works

Upload Audio & Avatar

Send your audio file (MP3, WAV, or M4A) along with the avatar video or image you want to animate. Specify the target language for optimal phoneme modeling.

AI Processing

Our neural network analyzes the audio waveform, extracts phonemes, and generates corresponding mouth shapes frame-by-frame. Facial expressions are adjusted to match audio emotion and intensity.

Download Synced Video

Receive your lip-synced video via download URL or webhook notification. Output includes the original avatar with perfectly synchronized mouth movements matching your audio.

Who Uses the Lip Sync API

Localization Companies

Dub video content into multiple languages without expensive reshoots. Original actor footage gets new audio tracks with matching lip movements for each target market.

Reduce video localization costs by 80% while maintaining authentic lip-sync that international audiences trust.

E-Learning Platforms

Create instructor-led courses in any language from a single recording. The same teacher appears to speak fluently in Spanish, German, Japanese, and more.

Expand course accessibility globally without hiring native-speaking instructors for every language.

Personalized Video Platforms

Generate thousands of personalized sales videos where the spokesperson says each prospect's name and company naturally, with perfect lip-sync.

Scale personalized video outreach that feels genuinely custom, increasing response rates by 3-5x over generic videos.

Before vs After August Ads Lip Sync API

Aspect	Without August Ads	With August Ads
Lip Sync Quality	Robotic mouth movements that immediately look artificial	Natural lip-sync indistinguishable from original recordings
Localization Speed	Weeks of manual editing or expensive reshoots per language	Minutes to generate perfectly synced content in any of 29 languages
Scalability	Each personalized video requires individual manual work	Generate thousands of personalized lip-synced videos automatically

Frequently Asked Questions

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Start using the Lip Sync API today with 5 free synchronizations. Full API documentation and language support guides available immediately.

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