join audio files different formats online

Join audio files of different formats: MP3 + WAV + OGG in the same output

Combining files of different formats is possible because the tool decodes each file to raw PCM independently before concatenating. MP3, WAV, OGG and FLAC — they all become Float32 sample streams in memory. The only complication is when files have different sample rates (e.g. 44100 Hz and 48000 Hz), which requires resampling.

Drag audio files here or click to selectMP3, WAV, OGG, FLAC, AAC, M4A — select multiple files

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What happens when sample rates are different

When the second track has a different sample rate from the first, the tool automatically resamples to the first track's rate using linear interpolation. For speech and podcast audio, the quality difference is imperceptible. For high-fidelity music, it is recommended to convert all tracks to the same rate first.

Common format combinations

Voice in WAV + background music in MP3

Input: narration.wav (48 kHz) + background.mp3 (44.1 kHz)
Expected output: WAV unido a 48 kHz com reamostragem do MP3

For best quality, keep the higher rate (48 kHz) as the base.

Safe use

Input: context + tool result
Expected output: interpreted with limits and next steps

Use the result as technical or educational support, keeping the tool limits explicit in the workflow.

Full tool FAQ

What is crossfade and when should I use it?

Crossfade is a transition technique where the end of one track fades out while the beginning of the next fades in, creating a smooth overlap. It is ideal for continuous music mixes, soundtracks, or podcasts where abrupt cuts would sound jarring.

What happens when tracks have different sample rates?

How many files can I join at once?

Can I change the order of tracks after adding them?

What is sample rate and which is most common?

What is the difference between WAV and MP3?

Can I use this tool to create music compilations?

Why is my exported file larger than the originals combined?

Frequently asked questions

Does linear resampling affect audio quality?

Linear interpolation is the simplest resampling method. For small rate differences (44.1 kHz to 48 kHz), it may introduce slight smoothing in high frequencies. For podcast, narration, and speech content use, the difference is imperceptible. For professional music production, use a high-quality resampling software like SoX or Reaper.

Does this page replace official or professional review?

No. It helps explain the scenario and use the tool more safely, but real decisions should consider official sources, full context and qualified guidance when needed.