Seamless AI Audio
Transform your visuals into complete multimedia experiences with advanced audio and voice synchronization. Create promotional videos with background music, generate talking avatars, and streamline your video production workflow.
Sound & Speech Integration
One-click background music and voiceover integration that brings your content to life
Background Music
Add professional background music to your videos with our extensive library of royalty-free tracks. Perfect for promotional content, social media posts, and marketing materials.
AI Voiceover
Generate natural-sounding voiceovers in multiple languages with emotional tone control. Create talking avatars with automated narration for engaging content.
Complete Production
Streamline your video production workflow with integrated audio tools. Create promotional videos with background music or talking avatars with narration in one go.
AI Lipsync Generator
Create realistic lip-synced videos with AI-powered speech synthesis. Upload a video and add natural-sounding speech with our advanced TTS technology.
Start CreatingActor Studio
Choose from our pre-defined avatars to create talking characters with synchronized speech
Professional
Business presentations
Casual
Social media content
Creative
Artistic projects
Educational
Learning content
Entertainment
Fun and engaging
Custom
Upload your own
How It Works
Create professional audio-visual content in just a few simple steps
Upload Your Content
Upload your video or image, or choose from our pre-defined avatars in the Actor Studio.
Add Audio
Select background music, generate AI voiceover, or upload your own audio file for synchronization.
Generate & Download
Our AI processes your content and creates a professional video with synchronized audio.
Sound Effects in Action
Watch how our revolutionary sound effects technology automatically adds cinematic audio to any scene
This scene was fully created and voiced using the Posternity Editor
You only need to write what you want for the sound effect. If your video includes a moving vehicle—like the train in this example—the Posternity Editor will automatically add appropriate sound effects. Explosion scenes will be matched with explosion sounds, and natural elements like wind or waves will also trigger fitting ambient effects.
Vehicle Sound Effects
Trains, cars, planes, and motorcycles are automatically detected and matched with authentic engine sounds, brakes, and movement audio.
Action & Explosion Effects
Dramatic scenes with explosions, gunfire, and impacts are automatically enhanced with professional sound design and audio effects.
Natural Ambient Sounds
Environmental scenes with wind, water, fire, and weather are enriched with realistic ambient soundscapes and atmospheric audio.
Why Choose Posternity Lip Sync?
Create realistic lip-synced videos with AI-powered speech synthesis and advanced TTS technology
15+ Natural Voices
Choose from a diverse library of natural-sounding voices including male, female, and various accents. Perfect for any content type and audience.
Perfect Lip Synchronization
Our advanced AI technology ensures perfect synchronization between speech and lip movements, creating realistic and professional results.
Lightning Fast Processing
Generate lip-synced videos in minutes, not hours. Our optimized AI processes your requests quickly while maintaining the highest quality standards.
Multiple Video Formats
Support for MP4, AVI, MOV, and other popular video formats. Upload any video and our AI will handle the rest with perfect compatibility.
Advanced TTS Technology
State-of-the-art Text-to-Speech technology with natural intonation, emotion, and pronunciation for the most realistic speech synthesis.
Smart Speech Recognition
Our AI understands context, emotions, and natural speech patterns to create perfectly synchronized lip movements that look completely natural.
Perfect For Every Use Case
From content creation to education, marketing to entertainment — add realistic speech to any video
Content Creation
Add realistic speech to your videos for TikTok, Instagram, YouTube, and more
Marketing & Ads
Create compelling product demos, promotional videos, and brand content with speech
Education & Training
Add voiceovers to educational content, tutorials, and training materials
Entertainment
Create engaging videos with synchronized speech for entertainment and creative content
Ready to Transform Your Content?
Start creating professional audio-visual content with AI-powered tools