Audio Converter. MP3 Converter

Convert audio files on your phone — in batches, in the background, and entirely offline.

Pick files, choose a format and bitrate, and start. Conversions keep running when you switch apps or lock the screen, and a batch that gets interrupted picks up where it left off. Your titles, artists, albums and cover art are carried across to every converted file.

Converts from almost anything MP3, AAC and M4A, WAV, AIFF, FLAC, ALAC, Ogg Vorbis and Opus, WavPack, WMA, APE (Monkey's Audio), TTA, Musepack, RealAudio, and DSD (.dsf and .dff). That includes the files Android itself can't play — 24-bit and 32-bit WAV, float WAV, ADPCM, and AIFF — all handled directly. Every input format is free.

Output formats
• MP3 — 128 to 320 kbps, encoded with LAME
• M4A (AAC)
• WAV — uncompressed, 16-bit PCM
• FLAC, ALAC, Opus and AIFF — with Audio Converter Pro

Built for batches Select a whole album or a folder's worth of files at once. Each file shows its own progress and outcome, and a failed file never stops the rest of the batch. Choose the output folder yourself, and optionally delete the originals once every file has converted successfully.

Tags and artwork travel with the music Title, artist, album, track number and cover art are read from the source and written into the output, whichever container it ends up in — ID3 for MP3, iTunes-style tags for M4A and ALAC, Vorbis comments for FLAC and Opus.

Private by design
The app has no internet permission at all. No ads, no analytics, no account, no tracking, and no file ever leaves your phone. It can't, even if it wanted to.

Audio Converter Pro
Everything above is free, with no daily limit and no watermark.
Pro adds:
• FLAC, ALAC, Opus and AIFF output • Unlimited files per batch (free batches are 15 files)
• Two conversions at a time Available as a monthly or yearly subscription, or a one-time lifetime purchase.