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MP3 Converter Online

Convert audio files to MP3, WAV and many more audio formats online. No file transfer needed!

* As we're using the very latest browser technologies, we only support the last two desktop versions of Chrome for now. More browsers will be supported soon.

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MP3 Converter Online

Our online audio converters are unique: they don’t need to transfer your audio files to a remote server in order to convert them, the audio conversion is done by the browser itself! Check out the “No data transfers” section below to learn more.

The other online converters typically send your audio files to a server in order to convert them and then the converted files are downloaded back to your computer. This means that in comparison to other online converters our audio converters are fast, economical on data transfers, and anonymous (your privacy is totally protected since your audio data is not transferred over the internet).

You can convert an unlimited amount of audio files without having to install any software, without having to sign up, and without having to transfer your files.

We hope you enjoy it!

We don't transfer your data

No data transfers!

We don’t transfer your data (files, location data, audio and video feeds) over the internet! All the operations performed by our tools are done by your browser itself. We use the latest web technologies (WebAssembly and HTML5) to develop tools that are fast and that protect your privacy. As opposed to most other online tools, we don’t need to transfer your files or other data over the internet to remote servers. With iotools' free online tools, no installation is required and your data never leaves your device!

Audio formats information

MP3

MP3 (otherwise known as MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) uses lossy data compression, meaning that it discards part of the audio data it encodes. The audio data discarded by MP3 compression corresponds to sound that is not audible by most humans. This type of compression involves a quality loss, but one that is unnoticeable by most people. MP3 compression normally achieves between 80% and 95% file size reduction.

WAV

WAV (Waveform Audio File Format) is the main format used by Windows and files in this format usually contain raw uncompressed audio. The underlying encoding is the linear pulse-code modulation (LPCM) format, also used for CDs where the audio is sampled at 44100 Hz with 16 bits per sample.

M4A

M4A (or MP4, stands for MPEG 4 Audio) uses the Advanced Audio Coding (AAC) standard to provide lossy audio compression, meaning that it involves some level of quality loss which however is usually inaudible. The audio quality is better than with MP3 at equal file sizes. Apple’s iTunes opens M4A files but those are typically encoded with the Apple Lossless Audio Codec (ALAC) for lossless data compression, meaning that no audio data and quality is lost.

FLAC

FLAC (Free Lossless Audio Codec) is a lossless audio coding format meaning that its audio compression involves no quality loss. File sizes can be reduced by up to 70% using FLAC without any sound quality loss.

OGG

OGG is an audio container format of which the underlying audio is typically coded with the free Xiph.org codecs: Vorbis or Opus for lossy audio compression and FLAC for lossless audio compression.

AIFF

AIFF (Audio Interchange File Format) was developed by Apple and commonly used on Mac computers. The underlying audio data in most AIFF files is uncompressed pulse-code modulation (PCM) meaning that file sizes can be large in comparison to lossy audio compression such as MP3 and M4A.


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