Audio to MP3 Converter
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Supports: AAC, AC3, AIF, AIFC, AIFF, AMR +14 more
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Turn almost any audio file into a universally playable MP3. This converter accepts 20 input formats — AAC, AC3, AIF, AIFC, AIFF, AMR, AU, CAF, DSS, FLAC, M4A, M4B, MP3, OGA, OGG, Opus, VOC, WAV, WEBA, and WMA — and lets you set the bitrate, sample rate, and channels before you download. MP3 is a lossy format, but it plays on essentially every phone, car stereo, browser, and media player ever made, which is why it stays 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 Bitrate: Leave Quality Preset on a high setting like "Highest" or "Very High" for transparent results, or switch to Constant Bitrate to choose an exact value such as 192 or 320 kbps (the Constant Bitrate default is 128 kbps). Variable Bitrate, Custom Bitrate, and Specific file size are also available.
- Set Sample Rate and Channels (optional): Use Audio Sample Rate (Original, 44100 Hz for CD quality, 48000 Hz, or lower) and Audio Channel (Original, Stereo, Mono) — for example, Mono roughly halves the size of a spoken-word recording. A Trim control lets you keep only part of the track.
- Convert and Download: Click "Convert" and save your MP3. No sign-up, no watermark.
Popular Audio to MP3 Conversions
- WAV to MP3 — shrink big uncompressed masters into shareable files
- FLAC to MP3 — make lossless archives playable on any device
- M4A to MP3 — move Apple audio into a universal format
- AAC to MP3 — swap the Apple/streaming codec for the safe default
- OGG to MP3 — convert open-source Ogg Vorbis audio
- WMA to MP3 — free legacy Windows Media audio from Windows-only players
- OPUS to MP3 — turn modern low-bitrate Opus into broadly compatible audio
- MP4 to MP3 — pull the audio track out of a video
Why Convert to MP3?
MP3 (MPEG-1/MPEG-2 Audio Layer III) was standardized as part of ISO/IEC 11172-3 in 1993, and its core patents had all expired by 2017. That long history is exactly why it is the most compatible audio format in existence: decoders are baked into virtually every operating system, browser, car head unit, Bluetooth speaker, and portable player.
People convert to MP3 for three practical reasons: compatibility (an M4A, WMA, or Opus file that stalls on an older car stereo or cheap player will just work as MP3), size (a lossless WAV or FLAC drops to a fraction of its size), and sharing (email, messaging apps, and podcast hosts all accept MP3 without a second thought). If you only want to shrink a file while keeping its current format, use the audio compressor instead of converting.
MP3 Bitrate and Quality Guide
| Bitrate (CBR) | Best for | Transparency |
|---|---|---|
| 96 kbps | Voice memos, spoken-word podcasts | Audible artifacts on music |
| 128 kbps | Casual listening, streaming | Acceptable for most casual ears |
| 192 kbps | Music you'll keep, decent earbuds | Hard to fault for most people |
| 256 kbps | Quality music libraries | Near-transparent for most listeners |
| 320 kbps | The MP3 maximum, archival music | Indistinguishable from source for most listeners |
MPEG-1 Audio Layer III caps out at 320 kbps and supports 32, 44.1, and 48 kHz sample rates (MPEG-2 extensions add lower rates for voice). Variable Bitrate (VBR) presets — such as 170–210 kbps — let the encoder spend more bits on complex passages and fewer on quiet ones, often matching a Constant Bitrate file's quality at a smaller size. Re-encoding a 128 kbps file at 320 kbps does not recover lost detail; bitrate only sets a ceiling.
MP3 vs Other Audio Formats
| Format | Type | Typical size (3-min track) | Best for |
|---|---|---|---|
| MP3 | Lossy | ~3–7 MB | Universal playback and sharing |
| AAC / M4A | Lossy | ~3–6 MB | Apple devices; cleaner below 128 kbps |
| WAV | Uncompressed PCM | ~30 MB | Editing masters, zero quality loss |
| FLAC | Lossless | ~15–20 MB | Archiving at full fidelity |
| OGG / Opus | Lossy | ~2–5 MB | Open-source apps, web and voice |
| WMA | Lossy | ~3–6 MB | Legacy Windows Media |
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 output bitrate to the source rather than inflating it.
What's the difference between Constant Bitrate (CBR) and Variable Bitrate (VBR)?
CBR uses the same bitrate for every second of audio, so file size is predictable and playback is rock-solid on old hardware — pick it for maximum compatibility. VBR lets the encoder raise the bitrate during busy passages and lower it during quiet ones, which usually gives the same perceived quality in a smaller file. This converter offers both, plus a Custom Bitrate field and a Specific file size target if you need to hit an exact number.
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 a FLAC source 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.
What audio formats can I convert to MP3 here?
Twenty: AAC, AC3, AIF, AIFC, AIFF, AMR, AU, CAF, DSS, FLAC, M4A, M4B, MP3, OGA, OGG, Opus, VOC, WAV, WEBA, and WMA. That covers Apple's M4A/AIFF/CAF, lossless FLAC and WAV, Windows WMA, Ogg/Opus from open-source apps, and voice formats like AMR and DSS. To keep a file in its current format but make it smaller, use the audio compressor.
Should I convert to MP3 or to AAC/M4A?
AAC (usually in an M4A container) generally sounds a little better than MP3 at the same low bitrate and is the default across Apple Music and iPhone Voice Memos, so it is the better choice inside the Apple ecosystem. MP3 wins on raw compatibility — if the file has to play on an unknown or older device, MP3 is the safer bet. For a lossless target instead, see convert audio to WAV.
Does converting to MP3 keep my metadata and album art?
Common tags — title, artist, album, and year — are carried into the MP3's ID3 tags wherever the source file provides them, and embedded cover art usually transfers too. A few unusual source containers store metadata in ways that don't map cleanly to ID3, so if a specific tag or artwork matters, check the output and re-add it if needed.
Is the MP3 output really playable everywhere?
For practical purposes, yes. Because MP3 was standardized in 1993 and its patents have expired, decoders ship in virtually every operating system, browser, car head unit, and portable player. The main exception is very old or niche hardware limited to a single vendor codec, which is exactly the kind of device this conversion helps you escape from.
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.