Audio Joiner
Combine multiple audio files into one seamless track. Add professional crossfades, adjust volume levels, and create perfect audio compilations online for free.
音声結合 - 複数の音声ファイルを結合
複数の音声ファイルをクロスフェードオプション付きでシームレスなトラックに結合
オーディオファイルをアップロード
任意の形式（MP3、WAV、OGG、M4A）で複数のオーディオファイルを追加
配置と設定
ファイルをドラッグして並び替え、クロスフェード時間を調整してスムーズな移行を実現
結合とダウンロード
結合をクリックしてファイルを結合し、結果をプレビューしてWAVとしてダウンロード
プロのヒント: DJミックスやシームレスな移行にはクロスフェードを使用します。0秒に設定すると、重複なしで単純に連結されます。
What is an Audio Joiner?
An audio joiner (also called audio merger or audio combiner) is a tool that lets you combine multiple audio files into a single, continuous track. Unlike simply placing files back-to-back, our AI-powered audio joiner adds professional crossfades between tracks, automatically matches volume levels, and creates seamless transitions. This is perfect for creating DJ mixes, podcast compilations, meditation playlists, audiobook chapters, or any situation where you need to merge multiple audio files into one cohesive piece. Our browser-based tool works with all common audio formats including MP3, WAV, M4A, and FLAC, processing everything locally for maximum privacy and speed.
How to Use the Audio Joiner
Upload Your Audio Files
Select multiple audio files from your device. Drag and drop to reorder them. Supports MP3, WAV, M4A, FLAC, and other common formats. No file count limits.
Customize Transitions
Choose crossfade duration (0-10 seconds), adjust volume levels for each track, and preview transitions. Our AI automatically suggests optimal settings based on your audio.
Export Your Merged Track
Download your combined audio file in high-quality MP3 or WAV format. All processing happens in your browser - your files never leave your device.
主な機能
最適な用途
DJ Mix Compilation
Create seamless DJ mixes by combining multiple tracks with automatic beatmatching and crossfades. Perfect for mixtapes and radio shows.
Podcast Production
Merge intro music, multiple segments, ads, and outro into one complete podcast episode with professional transitions.
Audiobook Chapters
Combine multiple audiobook chapters into a single file for easier listening. Add subtle crossfades between chapters for smooth transitions.
Meditation & Relaxation
Create long meditation sessions by joining multiple ambient tracks, nature sounds, or guided meditations with seamless transitions.
よくある質問
How many audio files can I join together?
There's no limit on the number of files you can join. However, very long compilations (3+ hours) may take longer to process depending on your device's performance.
What audio formats does the audio joiner support?
We support all common audio formats including MP3, WAV, M4A, FLAC, OGG, and AAC. You can even mix different formats in the same project - we'll handle the conversion automatically.
Will the audio quality degrade when merging files?
No. We use lossless processing techniques to preserve the original audio quality. When exporting to MP3, you can choose the bitrate (up to 320kbps). For maximum quality, export as WAV.
How do crossfades work in the audio joiner?
Crossfades gradually fade out the ending of one track while fading in the beginning of the next track, creating a smooth transition. You can adjust the crossfade duration from 0 seconds (no fade) to 10 seconds (long, gradual transition).
Can I adjust the volume of individual tracks?
Yes! Each track has its own volume slider. We also provide an automatic volume normalization feature that balances all tracks to similar loudness levels.
Is my audio uploaded to a server?
No. All audio processing happens entirely in your browser using Web Audio API. Your files never leave your device, ensuring complete privacy and faster processing.
Can I use the merged audio commercially?
You can use our tool to merge any audio, but the copyright of the output depends on the input files. If you own the rights to all source files, you own the rights to the merged output. For royalty-free music, use our AI Music Generator.
What's the difference between audio joiner and audio cutter?
Audio joiner combines multiple files into one, while audio cutter splits or trims a single file. Often you'll use both: cut individual tracks to the perfect length, then join them together into a compilation.
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