Can I convert audio to MP3 for free?

Yes. Audio-Join.com uses lamejs to encode MP3 up to 320 kbps entirely in your browser.

Are files uploaded to a server?

No. All processing is 100% in your browser. Files never leave your device.

🔄 Audio Converter

Convert any audio file to MP3, WAV, M4A, OGG, OPUS, FLAC, AAC or WebM — preview, trim, then convert instantly in your browser

🔗 Audio Merger 🔄 Audio Converter

Click to upload audio files

MP3, WAV, M4A, AAC, OGG, FLAC, WMA, OPUS — drag & drop supported

⚠ Max 50 MB per file

Files to Convert 🔊 Preview · ✂ Trim · convert individually or all at once

Convert To

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⚡ Why Use Audio-Join.com Converter?

Our free online audio converter transforms any audio file into your desired format entirely in your browser — including preview, trim, and convert — your files are never uploaded to any server.

🔊

Preview Before Converting

Play any uploaded file to confirm it's the right one before conversion.

✂️

Trim Before Converting

Set start and end points with a visual waveform. Only the trimmed section gets converted.

📦

Batch Convert

Upload multiple files and convert all at once with one click.

🔒

100% Private

Files never leave your device. No upload, no storage, no tracking.

📋 How to Convert Audio Files Online

Step 1 — Upload: Click the upload area or drag and drop audio files. Each file must be under 50 MB. You can upload multiple files for batch conversion.

Step 2 — Preview (optional): Click the 🔊 icon next to any file to play it in your browser before converting.

Step 3 — Trim (optional): Click ✂ to open the trim panel. Drag the green handles on the waveform to set start and end points. Preview the trimmed section before converting.

Step 4 — Choose format: Select MP3, WAV, M4A, OGG, OPUS, FLAC, AAC, or WebM. For MP3 choose quality (96–320 kbps).

Step 5 — Convert & Download: Click Convert. A player appears under each file when done — preview the converted audio, then download it. Use Download All for batch files.

🎵 Supported Conversion Formats

Output Format	Quality	Best For
MP3	Up to 320 kbps	Universal — plays everywhere
WAV	Lossless 16-bit PCM	Professional, editing, archiving
M4A	Lossless / AAC	iPhone, iPad, iTunes, Apple Music
OGG	Opus codec	Open format, web use
OPUS	Best at low bitrate	Voice, podcasts, small files
FLAC	Lossless compressed	Audiophiles, archiving
AAC	Varies by browser	Mobile, streaming
WebM	Opus codec	Web streaming

❓ Frequently Asked Questions

How do I convert audio files online for free?

Upload your file at Audio-Join.com, select output format, optionally trim, and click Convert. Everything runs in your browser — no account or payment needed.

Can I trim audio before converting?

Yes! Click the ✂ icon next to any file. A visual waveform appears — drag the green handles to set start and end trim points. Preview the trimmed section before converting. Only the trimmed portion gets converted.

Can I preview the converted audio before downloading?

Yes. After conversion, an audio player appears under each file so you can listen to the result before deciding to download it.

Can I convert MP3 to WAV without losing quality?

Yes. WAV uses raw lossless PCM — no compression. The decoded audio is written directly to WAV with no quality loss.

How do I convert audio to M4A for iPhone?

Select M4A as output and click Convert. Our pure JavaScript MP4 writer creates a proper M4A file playable on iPhone, iPad, Mac, and iTunes.

Can I convert multiple files at once?

Yes! Upload as many files as needed. Click Convert All and each file is processed sequentially. Download individually or use Download All.

Are my audio files uploaded to a server?

No. All conversion happens 100% in your browser using the Web Audio API. Files are never uploaded, stored, or transmitted anywhere.

What is the file size limit?

Each file can be up to 50 MB. No limit on the number of files per session.