Audio Converter
Convert audio files between formats: MP3, WAV, OGG, AAC, FLAC & more. Fast, free online audio conversion with quality preservation. No limits.
Supports MP3, WAV, AAC, MP4, etc.
About Audio Converter
Free Online Tool
Audio Converter
Convert any audio file to MP3, WAV, AAC, M4A, FLAC, or OGG — with full control over output bitrate. No account, no upload limit on conversions, no watermark on output.
How to Use This Tool (30 Seconds)
- 1Upload Your Audio File: Click the upload zone and select your source file. MP3, WAV, AAC, M4A, FLAC, OGG, AIFF, and OPUS are all accepted as input formats.
- 2Choose Your Output Format: Select the target format from the format buttons — MP3, WAV, AAC, M4A, FLAC, or OGG. Each format shows its codec and typical use case inline.
- 3Select a Bitrate: Pick your output quality from the bitrate dropdown. Options range from 64 kbps (small file, voice-only) up to 320 kbps (maximum quality). For lossless formats like WAV and FLAC, bitrate selection is replaced by bit depth.
- 4Convert and Download: Hit 'Convert.' Processing runs in-browser and your converted file downloads automatically — named with the correct extension and ready to use.
Bitrate, Sample Rate & Audio Quality — The Exact Relationship
For lossy formats (MP3, AAC, OGG), output quality is governed by the bitrate formula — the number of bits used to represent one second of audio:
// Bitrate determines file size and perceived quality
fileSizeMB = (bitrate kbps × duration seconds) ÷ 8,000
// Example: 3-minute song at 128 kbps
fileSizeMB = (128 × 180) ÷ 8,000 = 2.88 MB
// Same song at 320 kbps
fileSizeMB = (320 × 180) ÷ 8,000 = 7.2 MB
// Lossless: quality defined by bit depth × sample rate
WAV 16-bit/44.1kHz = 1,411 kbps (CD quality)
FLAC 24-bit/96kHz = ~4,608 kbps (studio master)
A critical rule: converting a low-bitrate source to a higher bitrate never recovers lost quality. Converting a 96 kbps MP3 to 320 kbps produces a 320 kbps file with 96 kbps audio quality — the encoder fills the extra bits with redundant data. Always convert from the highest-quality source available.
Format Comparison — Codec, Quality & Use Case
| Format | Codec | Type | Recommended Bitrate | Best Use Case |
|---|---|---|---|---|
| MP3 | MPEG-1 Layer III | Lossy | 192–320 kbps | Universal sharing, podcasts, music |
| WAV | PCM | Lossless | 1,411 kbps (16-bit) | Editing, studio work, broadcast |
| AAC | Advanced Audio Codec | Lossy | 128–256 kbps | Streaming, YouTube, Apple devices |
| M4A | AAC in MPEG-4 | Lossy | 128–256 kbps | iTunes, iPhone, Apple ecosystem |
| FLAC | Free Lossless Audio | Lossless | 700–1,400 kbps | Archival, audiophile, master copies |
| OGG | Vorbis | Lossy | 128–192 kbps | Web apps, games, open-source platforms |
Bitrate Selection Guide — What Each Level Sounds Like
64 kbps
Voice calls, speech-only podcasts. Noticeable compression on music.
96 kbps
Acceptable for spoken word. Music sounds thin and loses high frequencies.
128 kbps
Standard streaming quality. Good for casual music listening, small file size.
192 kbps
Near-transparent for most listeners. Recommended minimum for music distribution.
256 kbps
High quality. Indistinguishable from lossless for most ears on most speakers.
320 kbps
Maximum MP3 quality. Use for final masters, audiophile distribution, archiving.
⚡ Pro Tip
AAC produces noticeably better audio quality than MP3 at the same bitrate — particularly below 192 kbps. A 128 kbps AAC file sounds closer to a 192 kbps MP3 due to AAC's more efficient psychoacoustic model, which better identifies and discards frequencies humans can't distinguish. If your target platform supports AAC (YouTube, Spotify, Apple Music, and all modern browsers do), choose AAC over MP3 at any bitrate below 256 kbps. Reserve MP3 only when maximum device compatibility with older hardware is a hard requirement.
Frequently Asked Questions
Q: Can I convert FLAC to MP3 without losing quality?
Converting FLAC to MP3 always introduces lossy compression — FLAC is lossless and MP3 is not. However, at 320 kbps the quality difference is imperceptible to most listeners on standard headphones or speakers. The practical quality loss is real but inaudible in normal listening conditions.
Q: What is the best format for music streaming platforms?
Spotify, Apple Music, and YouTube all accept MP3 and AAC. For uploads, AAC at 256 kbps is the optimal choice — it matches the bitrate these platforms use internally for high-quality streaming and avoids a second lossy re-encode on the platform's end.
Q: Why does my converted file sound worse than the original?
You are likely converting from an already-lossy source (MP3, AAC) to another lossy format. Each lossy conversion discards audio data permanently. For best results, always convert from a lossless source (WAV or FLAC). If a lossless source isn't available, match the output bitrate to the source bitrate rather than increasing it.
Q: What is the difference between AAC and M4A?
AAC is the audio codec — the compression algorithm. M4A is the file container that holds AAC-encoded audio. They are technically the same audio quality; M4A is simply the standard file extension Apple uses for AAC audio in the MPEG-4 container. Converting between them involves no re-encoding and no quality change.
Q: Which format should I use for voice memos or speech recordings?
MP3 at 96–128 kbps is sufficient for voice-only recordings — speech doesn't require the wide frequency range that music needs. This keeps file sizes small without any perceptible quality loss for spoken word content.
Q: Does converting to WAV or FLAC improve audio quality?
No. Converting a lossy file to a lossless format creates a lossless container around lossy audio data. The file size increases significantly but the audio quality stays identical to the lossy source. Lossless formats only preserve quality when the source was recorded or mastered losslessly from the start.
Q: Is OGG compatible with all devices and platforms?
OGG Vorbis has broad support on Android, Linux, and web browsers but limited native support on iOS and older Windows applications. Use OGG for web apps, HTML5 game audio, and open-source platforms. For general-purpose sharing where device compatibility is unknown, MP3 or AAC are safer choices.