Convert to MP3, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your MP3 file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert to MP3
MP3 is the most compatible audio format available. It plays on every phone, car stereo, smart speaker, media player, and streaming service without any special software. Whatever audio or video format your file is currently in, converting it to MP3 guarantees it will play wherever you need it.
BoltConverter converts to MP3 from more than 20 audio and video formats including MP4, WAV, AAC, FLAC, OGG, MOV, WMA, and others. Many conversions run directly in your browser without uploading anything. For formats that require server-side processing, files are deleted immediately after download. The default output quality is 192 kbps, which is transparent for music listening.
Choose your source format
Select the format you are converting from: MP4, WAV, AAC, FLAC, MOV, OGG, and many others are supported. Click the matching link.
Upload your file
Drag your audio or video file onto the upload area, or click to browse. Some conversions run in your browser; others use our server.
Click Convert
Start the conversion. Browser-based conversions complete in seconds; server-side conversions for large files may take up to a minute.
Download the MP3
Click Download to save your MP3. Server-side files are deleted immediately after download.
Frequently asked questions
Which formats can I convert to MP3?
BoltConverter supports MP4 to MP3, WAV to MP3, AAC to MP3, FLAC to MP3, OGG to MP3, MOV to MP3, WMA to MP3, M4A to MP3, and more. See the full list on this page.
What bitrate is the MP3 output?
The default output bitrate is 192 kbps, which is high enough to be indistinguishable from the source for most music.
Are my audio files uploaded to a server?
It depends on the format. Some conversions (like WAV to MP3) run entirely in your browser using WebAssembly, so nothing is uploaded. For other formats, the file is sent to our server and deleted immediately after you download the result.
Can I extract audio from a video file?
Yes. Upload an MP4, MOV, or other video file and the converter will extract the audio track and save it as an MP3.
Is there a file size limit?
Browser-based conversions have no size limit. Server-side conversions accept files up to 2 GB.