Convert FILES to MP3, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your FILES file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert FILES to MP3
Converting multiple audio files to MP3 in a single batch saves significant time when you need a consistent format for a music collection, podcast archive, or audio asset library. Common source formats include WAV, FLAC, AIFF, OGG, M4A, and WMA. The conversion runs in your browser using a WebAssembly-compiled audio codec, so none of your files are uploaded and there is no server-side size cap.
Browser-based batch processing works within the memory limits of your device. For very large archives (hundreds of files or very long audio), processing in smaller groups or using a dedicated desktop tool like FFmpeg or Handbrake may be faster and more reliable.
Select multiple audio files
Use the file picker to select all files you want to convert, or drag and drop a group of files. The tool queues them for processing.
Choose output quality
Set a bitrate that suits your use case. 128 kbps is suitable for voice; 192 kbps is standard for music; 320 kbps is the MP3 ceiling for archival quality.
Convert the batch
Click Convert. Each file is processed sequentially in your browser using WebAssembly. Progress is shown per file and overall.
Download all MP3 files
When the batch completes, download the converted MP3s individually or as a ZIP archive, depending on the tool's options.
Frequently asked questions
Are my audio files uploaded to a server?
No. The conversion uses a WebAssembly-compiled version of an audio codec running in your browser. Your files are processed in local memory and never transmitted.
What is the maximum number of files I can convert at once?
There is no hard limit, but browser memory is finite. For most desktop computers, batches of 50 to 100 typical music files (each under 100 MB) run without issue. Larger batches may cause the browser tab to use substantial RAM.
What formats can I convert to MP3?
Supported source formats include WAV, FLAC, AIFF, OGG Vorbis, M4A/AAC, WMA, and OPUS. FLAC and WAV are lossless sources that produce the best MP3 output quality.
What bitrate should I use for music versus podcasts?
For music, 192 kbps provides a good balance between quality and file size. For podcasts and voice recordings, 128 kbps mono is more than sufficient and cuts file size roughly in half compared to 192 kbps stereo.
Will metadata (track title, artist, album art) be preserved?
ID3 tag preservation depends on the source format and tool version. WAV and FLAC files often have limited or no embedded tags. M4A files typically have rich metadata that may or may not survive conversion. Check tags in a player like VLC after conversion.