Online Audio Converter

Convert common audio formats in a batch with codec, quality, and channel controls.

Max file size 250 MB

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How to Use the Online Audio Converter

Move common audio files into AAC, AIFF, ALAC, AMR, FLAC, M4A, MP3, OGG, WAV, or WMA for playback, editing, archiving, or sharing. New files inherit the shared setup, and each file can override its codec, rate control, sample rate, channels, effects, or trim.

1
Choose an output format
Keep MP3 or choose AAC, AIFF, ALAC, AMR, FLAC, M4A, OGG, WAV, or WMA for the destination.
2
Configure the batch
Select an output codec, then adjust its verified VBR or CBR, sample rate, channel, volume, effect, and trim controls where supported.
3
Check compatibility and metadata
Open a representative result in the receiving app and listen for artifacts. Confirm sample rate, channels, text tags, and whether missing cover artwork or source-specific fields matter to the workflow.

Choose an online audio converter format by purpose

An online audio converter is most useful when the next player, editor, archive, or upload service has a clear requirement. The format with the largest file is not automatically the best result.

MP3 for broad sharing: MP3 is practical for websites, messaging, downloads, and devices that need a compact audio file. It is lossy, so keep a lossless original when the recording will be edited or exported again.
AAC or M4A for modern delivery: AAC provides efficient lossy audio, while M4A is a common container for AAC or ALAC in Apple and mobile workflows. Choose the output requested by the destination instead of treating AAC and M4A as interchangeable labels.
WAV or AIFF for editing: These outputs can store uncompressed PCM for editors and interchange systems that expect sample-based audio. They are much larger than MP3 or AAC and do not restore detail if the input was already lossy.
FLAC or ALAC for lossless storage: Use a lossless format when the source is lossless or when another edit must avoid a lossy generation. FLAC is common across many systems, while ALAC is useful in Apple-oriented libraries. Confirm player support before choosing either.
OGG, AMR, or WMA for a stated need: OGG can carry supported Vorbis or Opus audio, AMR serves narrow voice workflows, and WMA remains relevant to some Windows systems. These are deliberate compatibility choices, not general upgrades from MP3.

Recommended online audio converter settings

The online audio converter filters controls according to the output codec. Start with the source values and change them only for a listening, editing, or delivery requirement.

Speech and transcription: For MP3, 96 or 128 kbps is often enough for a clear single voice. Mono can support a lower bitrate when stereo carries no useful information, but switching to mono does not reduce a fixed-bitrate file by itself. Leave Audio Sample Rate on Auto unless a service specifies another.
Podcasts and general listening: Use 128 or 192 kbps MP3 for spoken programs with music or ambience. Retain stereo when channel placement matters. AAC can achieve a useful result at compact rates, but use it only when the receiving app accepts the chosen output container.
Music delivery: Use 192 to 320 kbps MP3 and keep stereo for a good music source. A higher setting reduces additional encoding loss but cannot improve a low-bitrate input. Avoid repeated MP3 to AAC to MP3 conversions.
Editing and archive copies: Leave Audio Sample Rate on Auto and Audio Channels on Auto (codec compatible), then choose WAV, AIFF, FLAC, or ALAC according to the next tool. A supported source layout may be retained, while an incompatible rate or layout must be mapped to what the output codec accepts. For FLAC, compression level changes encoding effort and storage efficiency, not decoded quality.
A required sample rate: Select 44.1 or 48 kHz only when the destination calls for it. Raising the rate does not create high-frequency detail; lowering it can remove content. Unsupported codec, sample-rate, and channel combinations are hidden or rejected rather than silently substituted.

Estimate audio size before choosing an output

Duration and data rate provide a more useful estimate than the source extension. Lossless compression varies with the material, while fixed-bitrate lossy audio is easier to estimate.

MP3 at 96 kbps: Expect about 0.72 MB per minute. This is a compact speech setting, not a good universal choice for detailed stereo music.
MP3 at 192 kbps: Expect about 1.44 MB per minute. It is a practical middle point for general listening and mixed programs.
MP3 at 320 kbps: Expect about 2.4 MB per minute. Use it to limit added loss from a good source, not to repair a compressed recording.
16-bit stereo PCM at 44.1 kHz: Expect about 10.6 MB per minute before container overhead. A 48 kHz version is about 11.5 MB per minute. Higher bit depth, sample rate, or channel count increases uncompressed size.
FLAC and ALAC: Lossless size depends on the signal, bit depth, sample rate, and channels. Quiet or predictable material often compresses better than dense noise. The output can still be several times larger than a lossy delivery file.

These are decimal megabyte estimates. VBR choices, tags, and container overhead can move the final number. Leave headroom when a form rejects files above a strict limit.

Protect quality, tags, and the source recording

Every lossy conversion removes information according to the output codec and settings. Use the online audio converter once from the best available source. If a WAV or FLAC master exists, create MP3 or AAC delivery copies from that master rather than from an older compressed derivative.

Common artist, title, album, and track fields may map between compatible metadata systems, but custom fields do not always have equivalents. The current audio conversion does not preserve embedded cover artwork. Check a representative file before processing a music library that depends on tags or artwork.

Volume, fade, reverse, and trim controls render changes into the result. They are useful for a delivery copy, but they are not compatibility fixes. Preserve the untouched input when later editing may need the original level, timing, channel layout, or full duration.

For a mixed batch, apply one output format and settings that suit most files, then use a row override for a source with a different trim, channel layout, or sample rate. The source files can differ even though the destination is shared.

Troubleshoot audio output

A successful encode confirms that a file was written. Playback, library metadata, and production requirements still need a quick check in the intended destination.

The file is too large or sounds worse

Check whether the output is uncompressed or lossless. WAV, AIFF, FLAC, and ALAC can be much larger than MP3 or AAC without improving a lossy input. For a smaller delivery copy, choose an appropriate lossy format and bitrate.

If artifacts are audible, return to the best source, raise the bitrate, and remove unnecessary resampling or channel changes. Listen for metallic speech, watery high frequencies, unstable stereo, and clipped peaks.

The file fails or loses expected data

Start with Audio Codec and Audio Sample Rate on Auto, Audio Channels on Auto (codec compatible), no effects, and no trim. A damaged, encrypted, incomplete, or unsupported source can still fail even when its extension appears in the accepted list.

If the destination rejects a completed file, confirm the exact format, codec, sample rate, and channel requirements. The online audio converter only presents supported choices, but the receiving app may accept a narrower subset.

Choose a more specific input, a different output, or another common audio and video task.

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