Audio to MP3 Converter
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Supports: AAC, AC3, AIF, AIFC, AIFF, AMR +13 more
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Turn almost any audio file into a universally playable MP3. This converter accepts 19 input formats — AAC, AC3, AIF, AIFC, AIFF, AMR, AU, DSS, FLAC, M4A, M4B, MP3, OGA, OGG, Opus, VOC, WAV, WEBA, and WMA — and lets you set the exact bitrate, sample rate, and channels before you download. MP3 is lossy, but it plays on essentially every phone, car stereo, browser, and media player ever made, which is why it remains the safe default for sharing music and voice.
How to Convert Audio to MP3
- Upload Your Audio File: Drag and drop your file onto the page or click "+ Add Files." You can queue several files and convert them in one batch.
- Pick a Quality Preset (or set a bitrate): Leave Quality Preset on "Very High (Recommended)" for transparent results, or open Constant Bitrate to choose an exact value such as 192 or 320 kbps. The default is 128 kbps.
- Adjust Sample Rate or Channels (optional): Use Audio Sample Rate (Original, 44100 Hz, 48000 Hz, etc.) and Audio Channel (Original, Stereo, Mono) if you need a specific output — for example, Mono to halve the size of a spoken-word recording.
- Convert and Download: Click "Convert" and save your MP3. No sign-up, no watermark.
MP3 Bitrate and Quality Guide
| Bitrate | Best for | Roughly how transparent |
|---|---|---|
| 96 kbps | Voice memos, podcasts where size matters most | Audible compression on music |
| 128 kbps | General streaming, casual listening (the default) | Fine for most casual listeners |
| 192 kbps | Music you'll keep, good earbuds | Hard to fault for most people |
| 256 kbps | High-quality music libraries | Near-transparent for most listeners |
| 320 kbps | The maximum MP3 supports — archival music | Most listeners can't distinguish it from the source |
MPEG-1 Audio Layer III caps out at 320 kbps and supports 32, 44.1, and 48 kHz sample rates (MPEG-2 adds lower rates for voice). Pushing a 128 kbps file back up to 320 kbps does not recover detail — bitrate only sets a ceiling.
Frequently Asked Questions
Will converting FLAC or WAV to MP3 reduce the audio quality?
Yes, but usually not in a way you'll hear. FLAC and WAV are lossless, and MP3 is a lossy format that discards data your ears are least likely to notice. At 256 or 320 kbps the result is near-transparent for most listeners, while the file shrinks dramatically — a lossless track that's 30 MB as WAV often lands around 7 MB as a 320 kbps MP3. Keep your lossless original if you want a perfect archive.
If my source is already a low-bitrate MP3 or AAC, can I improve it by exporting at 320 kbps?
No. Quality lost during the first lossy encode is gone for good, and re-encoding at a higher bitrate only makes a larger file that still sounds like the low-quality source (sometimes slightly worse, since it now carries two rounds of compression artifacts). Match the bitrate to the source instead of inflating it.
What audio formats can I convert to MP3 here?
Nineteen: AAC, AC3, AIF, AIFC, AIFF, AMR, AU, DSS, FLAC, M4A, M4B, MP3, OGA, OGG, Opus, VOC, WAV, WEBA, and WMA. That covers Apple's M4A/AIFF, lossless FLAC and WAV, Windows WMA, Ogg/Opus from open-source apps, voice formats like AMR and DSS, and more. To shrink a file while keeping its current format instead of converting it, use the audio compressor.
Which bitrate should I pick for a podcast or voiceover versus music?
For speech, 96–128 kbps in Mono is plenty and keeps files small. For music you intend to keep, 192–320 kbps in Stereo is the sweet spot. In our testing, a 4-minute stereo song re-encoded from FLAC at 320 kbps produced a clean MP3 of roughly 9–10 MB, while the same track at 128 kbps came in near 3.8 MB.
Is the MP3 output really playable everywhere?
For practical purposes, yes. MP3 was standardized in 1993 (ISO/IEC 11172-3) and its core patents have since expired, so decoders are built into virtually every operating system, browser, car head unit, and portable player. If you need a specific lossless target instead, see convert audio to WAV.
What happens to my uploaded file after the conversion?
Your file is uploaded over an encrypted (TLS) connection, processed on our servers, and the output is returned to you. Uploaded files are deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.