Sync Every Device.
Perfectly Aligned.
Multi-device audio and video synchronization with sample-accurate FFT cross-correlation. Import, analyze, sync, and export — all in one beautiful tool.
v2.2.2 · Free & Open Source
Features
Everything You Need for Perfect Sync
Multi-Device Sync
Sync recordings from any combination of cameras, microphones, Zoom recorders, and phones. All devices aligned to a shared timeline.
Video Support
Import MP4, MOV, MKV, AVI, and more. Audio is extracted automatically via ffmpeg — no manual conversion needed.
FFT Cross-Correlation
Uses Fast Fourier Transform cross-correlation for sample-accurate alignment. Confidence scores tell you how reliable each match is.
Batch Processing
Handle dozens of clips across multiple tracks. Background processing with live progress, ETA, and cancel support.
Smart Grouping
Drag and drop files — AudioSync automatically groups them by device name and creation metadata into separate tracks.
Max for Live Plugin
Includes a Max for Live JavaScript plugin for transient alignment directly within Ableton Live sessions.
Workflow
Four Steps to Perfect Sync
Import
Create tracks for each recording device and add your audio or video files. Drag-and-drop or use the file picker. Video audio is extracted automatically. Supports WAV, AIFF, FLAC, MP3, MP4, MOV, MKV, and many more formats.
Analyze
One click runs FFT cross-correlation at 8 kHz — 36x faster than full resolution while maintaining sub-millisecond precision. Watch live progress with per-clip confidence scores and ETA.
Sync
Each track's clips are stitched into a single continuous audio stream at full resolution. Silence fills the gaps between clips, and crossfades smooth the transitions.
Export
Export one synced audio file per track — all the same length and perfectly aligned. Choose WAV, AIFF, or FLAC with 16/24/32-bit depth. Drop the files into any DAW or video editor.
Use Cases
Built for Real Production Workflows
Film & Video Production
Multi-camera shoots with separate audio recorders. Sync the main camera, B-roll cameras, and boom mic recordings into a perfectly aligned timeline.
Live Music Recording
Mix board recording plus audience mics, phone recordings, and instrument DIs. Every source aligned to the same timeline for mixing.
Podcast & Multi-Mic
Each host records locally on their device. AudioSync aligns all recordings even when they started at different times.
Field Recording
Multiple recorders placed in different locations. Sync ambient recordings, wildlife mics, and contact mics for spatial audio.
Content Creation
YouTube, TikTok, Twitch — sync your main camera, screen recording, and external mic without manual alignment in your editor.
Ableton Live Integration
Use the included Max for Live plugin for transient-level alignment directly inside your Ableton Live session.
Compatibility
Works With Your Files
Audio Formats
Video Formats (audio extracted via ffmpeg)
Audio Quality
High-Quality Audio Processing
Professional-grade audio pipeline that preserves every bit of your original recordings.
24-bit / 32-bit Float
Full bit-depth preservation throughout the entire processing pipeline. No quality loss from import to export.
Polyphase Resampling
SciPy-powered sample rate conversion with minimal artifacts. Professional-quality resampling when needed.
Lossless Formats
Native WAV, AIFF, and FLAC export. No lossy re-encoding anywhere in the pipeline.
Sample-Rate Preservation
Exports at your project's highest native sample rate. 44.1k, 48k, 96k, 192k — whatever your source files use.
Non-Destructive
Your original files are never modified. Analysis runs on 8 kHz copies; full-res audio is only read during export.
Scientific Precision
NumPy + SciPy powered DSP engine. FFT cross-correlation with sub-millisecond temporal accuracy.
Download
Free to Download & Use
No subscriptions, no watermarks, no limitations. AudioSync Pro is completely free for everyone.
Requires ffmpeg for video file support · Python 3.10+ for building from source
Faster than full-resolution analysis with 8 kHz downsampling
Sub-millisecond temporal precision for sample-accurate alignment
Full-res audio never loaded into memory during analysis phase