Audio to MP3 Converter
Convert multiple audio files to MP3 with adjustable bitrate, sample rate, trimming, volume and fades – all in your browser.
Drop your audio or video files below. Pick the part you want and get a standard MP3 in seconds.
or drag and drop them anywhere on this panel
Every audio and video format
MP3, WAV, FLAC, M4A, OGG, MP4, WEBM and more. Anything your browser can read directly is converted automatically.
Bulk upload, many files at once
Select several files together. Each one gets its own waveform and row, and Add more files lets you keep going.
Private by design
Files are converted inside your browser and are never uploaded anywhere.
MP3 output settings
Configure output settings for all files. They apply to every conversion below.
Drag on a waveform to select a part, drag the handles to fine-tune it, and click once to set the play position. With no selection the whole file is converted.
How to Convert Audio to MP3 Online
What Is the Audio to MP3 Converter?
The IndiPiano Audio to MP3 Converter is a free online tool for converting supported audio files into MP3 for music sharing, practice recordings and everyday listening. Convert individual files or a batch, trim unwanted sections and customise the output without installing software or creating an account. Your audio is processed on your device rather than uploaded to a conversion server.
Add Files, Preview and Select a Section
Choose your files or drag them into the converter. Common inputs include WAV, M4A, AAC, OGG, FLAC and WebM, depending on your browser’s decoding support. Preview each recording and use its waveform to select the part you want to keep. Drag the selection boundaries or enter start and end times for more precise trimming, or leave the selection unchanged to convert the whole recording.
Customise MP3 Quality and Sound
Choose a constant bitrate from 32 to 320 kbps, select a sample rate from 16 to 48 kHz, and keep the detected mono/stereo configuration or choose your own. Higher bitrates generally retain more detail during encoding, while lower settings reduce file size. The converter adjusts the effective bitrate to suit the sample rate. Set output volume from 25% to 300% and add fade-in or fade-out transitions of up to 30 seconds.
Convert and Download Your Files
Convert one file or use Convert all to MP3 to process the queue with your chosen settings. Follow each file’s progress, then download the finished MP3 files individually or together in a ZIP archive. Waveform previews and estimated output sizes help you prepare song excerpts, rehearsal tracks and recordings for sharing. The app uses browser audio decoding and LAME MP3 encoding; choosing a higher bitrate cannot restore detail already missing from the source recording.
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