SOUND FLIPPER GUIDES
Supported audio formats and current limits
Check Sound Flipper's qualified input subsets, eight output formats, precision rules, rate restrictions and honest desktop testing limits.
What the inspector accepts
The preview inspects actual content rather than trusting a filename. Qualified mono/stereo inputs include PCM WAV, native FLAC, uncompressed integer AIFF (AIFF-C is not supported), supported MP3, M4A with AAC-LC, ALAC or mapping-family-0 Opus, AAC-LC/ADTS, Ogg Vorbis, Ogg Opus and a restricted audio-only WebM subset. Video, DRM, ambiguous multiple audio tracks, unknown layouts and unsupported representations are refused.
Native FLAC input requires supported 16/24-bit audio and usable sample-count/checksum information. ALAC is qualified at 16/24-bit integer precision. WAV and AIFF preservation paths cover their supported 16/24/32-bit integer representations; float WAV is retained as float. An extension alone never guarantees support.
The tested Opus-in-M4A music-export layout may include one timed subtitle track and recognized C2PA provenance metadata. Conversion omits these extras with a warning; supported common tags and cover art follow your selected metadata policy. Video, additional audio tracks, fragmented files and external media remain unsupported.
Output choices
The table below is generated from the same capability registry as the converter. It describes the qualified export policy. Input-to-output combinations also have to pass the precision and timing checks shown before conversion.
- MP3
Easy to play and share. High-quality LAME encoding.
LAME CBR up to 320 kbps; encoder quality 0. The source sample rate can limit the bitrate.
- M4A (AAC)
A compact, widely supported file for phones and music apps.
AAC-LC two-loop encoding, up to 320 kbps stereo or 160 kbps mono; rate-dependent limits are shown.
- WAV
Uncompressed audio for editing and compatibility.
Preserves supported integer or float samples. Lossy sources become float32 WAV.
- FLAC
Lossless compression for keeping a high-quality master.
Compression level 8; 16-bit and 24-bit integer audio.
- M4A (ALAC, lossless)
Lossless audio in an M4A file.
Preserves supported 16-bit and 24-bit integer samples.
- AIFF
Uncompressed integer audio for compatible editing tools.
Preserves supported 16-bit, 24-bit and 32-bit integer samples.
- Opus
Efficient modern audio; check that your destination supports it.
128 kbps mono or 256 kbps stereo VBR, complexity 10. Output is 48 kHz; SoXR precision 28 if needed.
- Ogg Vorbis
High-quality VBR audio for compatible players.
libvorbis quality 8; supported source rates 8–96 kHz are preserved.
Important precision and timing boundaries
Lossy sources decode to float32 WAV. The basic conversion path will not silently turn those float samples into integer FLAC, ALAC or AIFF. It also refuses 32-bit integer input for lossy encoding or 24-bit-only output paths. Use a supported WAV/AIFF preservation route when those boundaries apply.
Vorbis output is limited to the listed supported source rates between 8 and 96 kHz. Opus output is explicitly 48 kHz. Raw AAC/ADTS retains decoded priming and padding because its admitted form does not declare an original gapless length. WebM must have a contiguous admitted timeline: irregular recorder timestamps, lacing and some tiny Opus files are refused. These are current qualification limits, not claims that the formats themselves lack those features.
Resource ceilings and practical testing
The interface allows up to ten files and three output configurations, with one active conversion. Individual input/output ceilings are 1 GiB, duration is bounded to two hours, and temporary session storage is capped at 2 GiB subject to browser quota. Without browser-private filesystem storage, the public preview conservatively limits the source and predicted decoded WAV to 8 MiB each and retains at most 32 MiB of outputs. Lower-level module ceilings are not a promise that the combined workflow can use them all at once. Actual available memory and disk space may require smaller files.
Automated desktop tests cover Chromium, Firefox and Linux WebKit. Physical mobile and hardware Safari tests have not been performed for this preview. See the recorded quality evidence; do not read a limit as a promise that every phone can process the maximum.