Audio Format Converter
Convert local audio to MP3, WAV, OGG, or AAC in the browser. Your files are never uploaded to our servers. ToolkitPoint processes them on your own computer, so confidential documents stay with you.
Processed in your browser. Your files are not uploaded.
How to use Audio Format Converter
- Pick one or many audio files (M4A, AAC, FLAC, OGG, WAV, MP3 or WMA) with "Choose local audio files"; a table shows each file's codec, bitrate, cover art and a quality check.
- Choose "Output format": MP3, "M4A / AAC" (a real .m4a file), WAV, FLAC or OGG Vorbis.
- Leave "Bitrate" on "Match the source" or pick 128 to 320 kbps; the menu is disabled for WAV and FLAC because they are lossless. Optionally set the sample rate, channels or loudness normalization.
- Keep "Keep tags", "Keep cover art" and "Copy without re-encoding when the source already matches" ticked unless you want a fresh encode; read any yellow quality warnings in the table.
- Press "Convert", then download each result (with a built-in player) or the ZIP for several files.
Worked example
Select three lossless FLAC files, choose MP3 at 256 kbps, and press Convert. Each file keeps its tags and cover art, the table shows no lossy-to-lossy warnings, and you download converted-audio.zip with three MP3 files.
When to use this tool
- Converting a WMA voice memo to MP3 for a phone that cannot play WMA.
- Making a lossless FLAC archive copy from a WAV recording.
- Levelling several podcast clips to a similar loudness before publishing.
Important limitations
Conversion runs through FFmpeg WebAssembly in your browser, one file at a time; files larger than 250 MB are skipped and very large batches can exhaust device memory. Converting lossy audio (for example AAC to MP3) cannot restore detail already discarded, so the page warns about it.
Frequently asked questions
Which formats ignore the Bitrate menu?
WAV is uncompressed PCM and FLAC is lossless, so the menu is disabled for them. MP3, M4A and OGG Vorbis follow the chosen kbps, or the source's own bitrate when "Match the source" is selected.
Does converting MP3 to FLAC improve quality?
No. Lossy detail already discarded cannot return. FLAC will store the decoded MP3 exactly, at a larger size. The quality table warns about this, and about lossy-to-lossy conversions and bitrate upscaling.
When is a file copied instead of re-encoded?
When the source codec already matches the output (for example MP3 to MP3 or AAC to M4A), "Match the source" is selected, and you have not changed sample rate, channels or loudness. The audio data is copied unchanged, so quality is identical and it takes moments. Untick the option to force a fresh encode.
Are tags such as artist and title kept?
Yes, tags are copied from the source when "Keep tags" is ticked. Cover art is kept for MP3, M4A and FLAC output when the source has an embedded JPEG or PNG; WAV and OGG output do not carry it here.
What does the normalization option do?
It applies a loudness filter aimed at -16 LUFS with a -1.5 dB true-peak ceiling and a loudness range of 11, in one pass, so results are an estimate rather than a mastering-grade match. It forces a re-encode.
Can I convert many files at once?
Yes. Select several files; they are converted one after another on your computer and offered as a ZIP. There is no daily limit, but each file must be under 250 MB and large batches use a lot of memory and time.