Audio Converter — Convert MP3, WAV, M4A & OGG Online

What is an Audio Converter?

An Audio Converter (ऑडियो कन्वर्टर) changes the format of an audio file — for example from WAV to MP3, from M4A to MP3, or from MP3 to WAV — while keeping the sound as close as possible to the original. Different devices, apps and services expect different formats: an old car stereo plays only MP3, audio editing software works best with WAV, Apple devices prefer M4A, and some web apps use OGG/Opus. When a file will not play or upload, converting it to the right format is the fix.

This converter handles the four formats you are most likely to need: MP3, WAV, M4A (AAC) and OGG (Opus). It reads almost any audio your browser can decode — including the soundtrack of video files — lets you choose a bitrate from 96 to 320 kbps, and converts up to 30 files in one go with a ZIP download at the end.

Conversion runs entirely in your browser. MP3 files are produced with the lamejs encoder; WAV, M4A and OGG are produced through the browser's WebCodecs encoders via the open-source Mediabunny library. Nothing is uploaded.

Key Features

• Four output formats: MP3, WAV, M4A (AAC) and OGG (Opus).
• Wide input support: MP3, WAV, M4A, AAC, OGG, OPUS, FLAC and audio inside MP4/WebM/MOV videos.
• Bitrate choice from 96 to 320 kbps for compressed formats.
• Batch conversion of up to 30 files.
• ZIP download of the whole batch.
• Re-convert with a different format or bitrate in one click.
• Automatic support check for AAC and Opus encoding in your browser.
• Clear results: source format, new format, size and duration for each file.
• Memory-friendly: files are decoded and encoded in chunks.
• Private and free: no upload, no sign-up, no limits.

How to Convert Audio — Step by Step

1. Open the converter on your computer or phone.
2. Choose the output format. If a note appears saying your browser cannot encode it, pick MP3 or WAV.
3. Choose the bitrate (not needed for WAV).
4. Add your files with the upload box or by dragging them in.
5. Watch each file convert; the new size appears when it is done.
6. Change settings and click Re-convert if you want to compare.
7. Download individual files or the ZIP.

Audio Formats Compared

Choosing the Right Bitrate

Bitrate is the amount of data used per second. For music, 192 kbps MP3 is transparent for most listeners on phones and normal speakers; 256–320 kbps leaves extra headroom for good headphones. AAC and Opus are more efficient than MP3, so 128–192 kbps in those formats often sounds as good as 192–256 kbps MP3. For speech — podcasts, lectures, audiobooks, voice notes — 96–128 kbps is plenty and keeps files small. Remember that bitrate only controls how much of the source quality is kept; it cannot add quality that the source does not have.

Lossy vs Lossless — What Really Happens When You Convert

Lossless formats such as WAV and FLAC store the audio exactly; converting between them never changes the sound. Lossy formats such as MP3, AAC (M4A) and Opus (OGG) save space by removing details that are hard to hear. Each time audio is encoded into a lossy format, some information is discarded for good. That is why converting a lossy file to WAV does not restore quality, and why converting from one lossy format to another loses a little more each time. The best practice is simple: keep a lossless or high-bitrate master, and create lossy copies from it for each purpose — small MP3s for sharing, AAC for Apple devices, Opus for web apps.

Sample rate and channels matter too. This converter keeps the original sample rate where the output format allows it, and MP3 encoding uses 44.1 or 48 kHz. Surround audio is mixed down to stereo for MP3, which is what most listeners need.

Troubleshooting

• "Your browser cannot encode AAC/Opus" — choose MP3 or WAV, or use Chrome or Edge, which support both.
• A file shows an error — it may be damaged, protected (for example DRM-protected music) or in a format your browser cannot decode.
• WAV files are huge — that is normal for uncompressed audio (about 10 MB per minute). Use MP3 or M4A for sharing.
• Conversion is slow — very long files and large batches take longer on phones; try smaller batches or a computer.

Why Choose the Prompt Minds Audio Converter?

Online converters usually upload every file, which is slow for WAV files and a privacy risk for personal recordings, and many limit you to one file at a time. This converter works locally, handles batches of 30 and shows exactly what each file became. It also checks your browser's capabilities up front instead of failing halfway, and it tells you honestly that converting cannot improve quality.

Which Format for Which Device?

When in doubt, MP3 at 192 kbps is the format most likely to play everywhere. Choose WAV only when another program needs uncompressed audio, because the files are roughly ten times larger.

10 Real-World Use Cases

1. Shrinking WAV recordings to MP3 for sharing.
2. Converting iPhone voice memos (M4A) to MP3 for Android or Windows.
3. Preparing WAV files for audio editing software.
4. Making MP3s for a car stereo or old music player.
5. Converting FLAC albums to MP3 for phone storage.
6. Creating OGG audio for web games and apps.
7. Standardising podcast episodes to one format and bitrate.
8. Extracting audio from videos in bulk.
9. Making M4A files for Apple Music libraries or iPhone ringtones.
10. Reducing lecture recordings to small 96 kbps files.

Common Mistakes to Avoid

• Mixing up M4A and MP4. M4A is an audio-only MP4 file; if a device rejects it, convert to MP3 instead of renaming the extension.
• Converting a whole library at the lowest bitrate. You cannot get quality back later; keep originals and choose at least 128 kbps for music.
• Converting MP3 to WAV expecting better sound. The file gets bigger, not better.
• Chaining lossy conversions. MP3 → AAC → MP3 loses quality each time.
• Using 320 kbps for speech. It wastes space; 96–128 kbps is enough.
• Renaming files instead of converting. Changing ".wav" to ".mp3" does not convert anything.
• Forgetting tags. Check titles and cover art after converting music.

Quick Glossary

• Lossless: a format that keeps every detail of the audio, such as WAV or FLAC.
• Lossy: a format that removes hard-to-hear detail to save space, such as MP3, AAC or Opus.
• Bitrate: data per second of audio, written in kbps.
• Sample rate: how many samples per second the audio contains, usually 44.1 or 48 kHz.
• Codec: the method used to compress the audio, such as MP3, AAC or Opus.

Browser Support and Limits

MP3 and WAV output work in all modern browsers. M4A (AAC) and OGG (Opus) output need your browser's audio encoders: Chrome and Edge support both on most systems, Safari supports AAC, and Firefox supports Opus; the tool checks automatically. Input formats depend on what your browser can decode. Each file can be up to 500 MB and a batch up to 30 files. An internet connection is needed once to load the processing libraries.

Audio Converter — Key Facts

Frequently Asked Questions

Explore More Prompt Minds Tools

Audio Converter works great alongside our other free tools. Every Prompt Minds tool runs entirely in your browser — no sign-up, no uploads, no watermarks. Browse all free tools.