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MP3 Converter Online

MP3 Converter Online

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

To use this tool, you must agree with our Terms of Service and Privacy Policy.

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Introduction to the MP3 Converter online tool

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!

Privacy Protected

Privacy Protected

We develop secure online tools that are cloud-based or that execute locally on your device. Protecting your privacy is one of our main concerns when developing our tools.

Our online tools which execute locally on your device don't need to send your data (your files, your audio or video data, etc.) over the internet. All the work is done locally by the browser itself, making these tools very fast and secure. To achieve this we use HTML5 and WebAssembly, a form of code that is run by the browser itself allowing our tools to execute at near-native speed.

We work hard to make our tools run locally on your device since avoiding sending data over the internet is more secure. Sometimes however this is not optimal or possible for tools which for example require high processing power, display maps aware of your current location, or allow you to share data.

Our cloud-based online tools use HTTPS to encrypt your data sent to and downloaded from our cloud infrastructure, and only you have access to your data (unless you have chosen to share it). This makes our cloud-based tools very secure.

For more information, see our Privacy Policy.

Audio formats information


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


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.