Audio Converter
Convert your audio and video files into MP3, WAV, M4A, FLAC, and more. Processed entirely inside your browser for ultimate speed and privacy.
Choose an Audio or Video file
Or drag and drop your file here
Processed securely on your device. No files are uploaded to our servers.
audio.mp3
Original Size: 0 MB
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Loading Audio Engine
Fetching local processing core...Converting File...
Encoding locally...How to Convert Audio Files Online
Change your audio files to MP3, WAV, M4A, FLAC, and more. Even extract audio directly from video files in three easy steps.
Upload Your File
Select an audio file or an MP4 video from your device. Because processing happens locally, there are no upload wait times to worry about.
Choose Format
Select your desired target format. Choose MP3 for maximum compatibility, or WAV/FLAC if you need to retain uncompressed, studio-quality sound.
Convert & Download
Hit the convert button. Our WebAssembly engine instantly re-encodes the file to your exact specifications, preparing it for immediate download.
Why Use Our Audio Converter?
Supports All Major Formats
Whether you need an M4A for Apple devices, an OGG for a web project, or a lossless FLAC for archiving, our tool handles the most popular codecs effortlessly.
100% Private (No Uploads)
Traditional tools force you to upload personal recordings to their servers. We use WebAssembly to convert your file directly inside your browser. Your data never leaves your device.
Extract Audio from Video
Need the soundtrack from a video clip? Just upload an MP4 or MKV file. Our converter will automatically strip away the video track and save the audio in the format you chose.
Smart Quality Control
When converting to compressed formats like MP3, you can explicitly set the bitrate. When converting to lossless formats like WAV, the system automatically preserves max fidelity.
Frequently Asked Questions
Yes, it is entirely private. Toolszu uses modern WebAssembly technology to process your audio file entirely within your browser's memory. The file is never uploaded to our servers, making it 100% safe for personal and confidential recordings.
If you want maximum compatibility across all devices and smaller file sizes, choose MP3. If you are doing professional audio editing and need uncompressed, perfect quality, choose WAV. For Apple devices, M4A is highly optimized.
WAV and FLAC are "lossless" audio formats. This means they do not use standard bitrate compression to reduce file size. They are designed to be an exact mathematical copy of the original audio stream, so bitrate selection is intentionally disabled for them.
Because the conversion happens entirely within your web browser, it relies on your device's RAM. We recommend uploading files under 100MB to prevent your browser from running out of memory and crashing during the encode.
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