Audio Joiner

About Audio Joiner

This online audio joiner allows you to merge and combine multiple audio files into one audio file directly in your browser. Simply select your audio files, drag to reorder them, and merge. All processing happens locally for complete privacy. See also our Audio Trimmer and Audio Normalizer.

What audio formats are supported?

You can upload MP3, WAV, OGG, AAC, and M4A audio files. The output can be in MP3, WAV, OGG, AAC, or match the first audio file's format.

How do I merge audio files?

Click to select multiple audio files or drag and drop them. The audio files will be merged in the order shown. You can drag audio files up or down to reorder them before merging.

What is the file size limit?

The total combined size of all audio files should not exceed 100MB. This ensures smooth processing in your browser. For larger audio files, consider using desktop audio editing software.

Will merging affect audio quality?

Audio files are re-encoded to ensure compatibility and seamless joining. You can choose the output quality (High: 320kbps for MP3, Medium: 192kbps, Low: 128kbps) to balance quality and file size.

Can I merge audio files of different formats?

Yes! All audio files are automatically converted to the same format during merging to ensure compatibility. You can choose the output format (MP3, WAV, OGG, AAC, or match first audio).

Is my audio file safe?

Absolutely! All audio processing happens directly in your browser using FFmpeg.wasm (WebAssembly). Your audio files are never uploaded to any server. Everything stays private on your device.

Can I preview before downloading?

Yes! After merging, you can preview the merged audio file directly in the player before downloading it.

How long does merging take?

Merging time depends on the total audio length and your device performance. Typically, merging 2-3 short audio files takes 15-30 seconds. Longer or more audio files will take proportionally longer.

Can I merge music files or songs?

Yes! This tool is perfect for merging music files, songs, podcast segments, or any audio files. Just upload your files and merge them in your desired order.

What quality settings should I use?

Use 'High' (320kbps for MP3) for best audio quality. Use 'Medium' (192kbps) for balanced quality and file size. Use 'Low' (128kbps) for smaller file sizes when quality is less critical.

Crossfade vs silence gap: which should I use?

Crossfade overlaps the end of one track with the start of the next for a seamless, gapless blend — ideal for DJ mixes, gapless albums and music playlists. A silence gap inserts a few quiet seconds between tracks instead, which suits audiobook chapters, podcast segments (intro + episode + outro) or any content that needs a clear pause. They are mutually exclusive; set one slider above 0 and the other resets to 0.

How does loudness normalization (LUFS) work and which preset should I pick?

Enable 'Normalize loudness' to auto-level quiet and loud tracks to one consistent volume using EBU R128 loudnorm, so listeners never reach for the volume knob. Pick the target to match your delivery platform: -14 LUFS for streaming (Spotify, YouTube), -16 LUFS for podcasts (Apple Podcasts standard), or -23 LUFS for TV/broadcast (EBU R128). There is also a simple peak-normalize option (-1 dB) when you only want headroom control without LUFS leveling.

What output sample rate and bitrate should I use for podcast vs broadcast delivery?

Use 'Output Sample Rate' to force a uniform, spec-compliant rate instead of inheriting whatever the first clip happens to be. Choose 44.1 kHz for music distribution (Spotify) and 48 kHz for podcast and video/broadcast deliverables. For bitrate, 192 kbps MP3/AAC is a solid podcast voice setting, 256-320 kbps suits music, and WAV (PCM) is best when a producer asks for a lossless master. A typical podcast deliverable is -16 LUFS at 48 kHz; broadcast is -23 LUFS at 48 kHz (EBU R128).