Free MP3 Converter — convert audio & video to MP3 online

An MP3 converter is a free audio converter and audio file converter that converts audio files to MP3 and MP3 to WAV, MP3 to AAC, MP3 to M4A, MP3 to FLAC and 12 more formats. This MP3 converter online runs 100% in your browser with ffmpeg.wasm — no uploads, no signup, no watermark. It is the fastest online MP3 converter and free audio converter for batch jobs up to 300 MB per file.

To convert audio to MP3 with this online MP3 converter: 1) Drop files (WAV, M4A, FLAC, OGG, etc.) or click to browse — batch supported. 2) Choose MP3 as output and pick a bitrate (64, 96, 128, 192, 256, 320 kbps). 3) Click Convert — watch conversion progress, duration, bitrate, sample rate and channels with before/after previews. 4) Download MP3s individually or via Download all. All processing is client-side, so your files never leave your device.

Yes — this free audio converter and MP3 converter online is 100% free, no signup, no watermark, no limits on conversions. As a true audio file converter it runs locally with ffmpeg.wasm, so you can use it as often as you want without uploading to a server.

You can convert audio to MP3 from 16 input formats: MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, AIFF, WMA, WEBM, MKA, MP2, ALAC, AC3, CAF, 3GP and any ffmpeg-supported audio. Simply drop WAV, M4A, FLAC, OGG, etc. and choose MP3 with your preferred bitrate.

Yes — use this audio converter to do MP3 to WAV for lossless editing in Audacity, Premiere, etc. Drop your MP3s, select WAV as output (PCM 16-bit), keep original sample rate or choose 44.1/48 kHz, then Convert and download. WAV is uncompressed, so files will be larger than MP3 but ideal for editing.

Yes. This MP3 converter handles MP3 to M4A, MP3 to AAC and MP3 to FLAC in one batch. Choose M4A/AAC for Apple devices and streaming, or FLAC for lossless archiving. Drop MP3s, pick the output format, convert and use the before/after preview to verify, then download.

Yes — this tool works as an MP4 to MP3 converter. Drop MP4, MOV, WEBM or 3GP video files and it extracts the audio track and encodes it to MP3 at your chosen bitrate. You can also use it to convert video soundtracks from other containers. Everything runs locally in your browser, so video files convert fast without being uploaded.

Yes — this audio file converter supports full batch conversion with queue management. Drop many files, see file name, size, format, conversion progress and success/error status per file, preview before/after, and use Remove, Retry, Cancel and Reset controls. Download converted files individually or via Download all. Queue stays responsive even with large batches.

Choose the MP3 bitrate based on quality vs file size: 64–96 kbps for voice/small files, 128 kbps for good general quality, 192 kbps balanced for most music, 256–320 kbps for highest quality and archiving. This MP3 converter offers 64, 96, 128, 192, 256, 320 kbps — selected only when output is MP3.

MP3 is lossy, so convert audio to MP3 at low bitrates can reduce quality versus lossless WAV/FLAC. At 192–320 kbps the difference is transparent for most listeners, while 64–128 kbps trades quality for smaller files. Because conversion is client-side, you can test bitrates quickly, keep the original, and compare previews before downloading.

Yes — 300 MB per file. You’ll see a clear error if a file is too large before conversion starts. This limit keeps client-side processing with ffmpeg.wasm fast and stable. For larger files, trim or split the audio first, then drag & drop again. Temporary files are auto-deleted after conversion and on page close for privacy.