Best Audio Format for Editing

Why the editing format matters

Most audio editing decisions don't hinge on format — volume adjustments, cuts, fades, and EQ work the same whether you're working on a WAV or an MP3. The format choice matters for one specific reason: what happens when you save.

If you open an MP3, make an edit, and save back as MP3, the encoder runs again. The file that went in was already compressed. The file that comes out has been compressed twice. Each encode discards audio data. Over multiple edit cycles, this accumulates into audible degradation — high frequencies smear, the stereo image narrows, transients sound soft. On a voice recording it might produce a hollow, slightly hollow quality; on music it's most obvious in cymbals and reverb tails.

Working in WAV sidesteps this entirely. WAV stores uncompressed PCM. There's no encoder. Saving a WAV is writing raw samples to disk — no quality cost, no matter how many times you do it.

WAV: the default choice for editing

WAV is the audio equivalent of a TIFF in photography — large, uncompressed, and the format that professional tools are built around. The main characteristics that make it the right editing format:

• →Universal DAW support. Audacity, Adobe Premiere, DaVinci Resolve, Logic Pro, Pro Tools, Reaper — every audio editor reads and writes WAV without any plugin or codec installation.
• →No quality loss on save. PCM is not encoded or decoded — it's stored as-is. The 10th save is identical to the 1st.
• →Accurate waveform display. Because there's no lossy compression, waveform visualisation in editors is accurate. What you see is what's there.
• →Supports high sample rates and bit depths. 96 kHz / 32-bit float for professional work; 44.1 kHz / 16-bit (CD quality) for standard outputs. The format handles both.

The only downside is size. A one-hour stereo recording at CD quality is about 600 MB as WAV. For archival or long-term storage between sessions, FLAC is the practical alternative.

FLAC: for storage between sessions

FLAC (Free Lossless Audio Codec) compresses audio losslessly — like a ZIP file for audio data. The result is 40–60% smaller than WAV with zero quality difference. A 600 MB WAV becomes roughly 250–350 MB as FLAC.

FLAC works well for storing project audio between sessions: exporting your working files to FLAC overnight, or archiving finished source material. Most DAWs and editors can import FLAC; some can't export it natively (in which case you export WAV and convert with a tool like QuickAudioConvert afterward).

FLAC is not as well-supported for real-time editing operations as WAV on some systems, because the decompressor adds a small processing overhead. For storage it's excellent. For the active working timeline, WAV is still the path of least resistance.

AIFF: the Mac alternative

AIFF (Audio Interchange File Format) is Apple's equivalent of WAV — uncompressed PCM in an Apple-developed container. It is technically identical in quality to WAV. Logic Pro and GarageBand use AIFF natively; many Apple users encounter it in exports from those tools.

For editing purposes, WAV and AIFF are interchangeable. On macOS-only workflows, AIFF is perfectly valid. For cross-platform projects — or if you're sending files to Windows users or non-Apple tools — WAV is safer.

What to do when you only have an MP3

If your source file is an MP3 and you don't have the original lossless version, convert to WAV before editing. This isn't a quality upgrade — the audio is still MP3-quality after conversion. But it means further edits and saves won't add additional compression artefacts on top of what's already there.

The rule is: lock in the MP3 quality ceiling by converting to WAV once, then edit from the WAV and export once at the end. This is better than the alternative of editing the MP3 directly and re-encoding it multiple times.

Export format after editing

What you export depends on where the file is going, not on the editing format: