WEBA to M4A Converter

How to Convert WEBA to M4A Online

1. Upload Your WEBA File: Drag and drop or click "Add Files" to select WEBA (WebM Audio) files. WhatsApp/Discord voice notes saved from the desktop apps, MediaRecorder browser captures, yt-dlp Opus rips, and Web Audio API exports all work. Batch is supported — drop a whole folder of voice notes in one pass.
2. Pick AAC Bitrate (M4A's codec): Default is constant bitrate at 128 kbps AAC. Pick a quality preset (Lowest through Highest) for one-click selection, target a percentage of the source size or an exact file size, or set a custom CBR/VBR rate (24, 48, 64, 96, 128, 192, 256, 320 kbps). Voice WEBA from web recorders is typically 24-48 kbps mono — there's no benefit to picking 320 kbps. 64-96 kbps mono AAC is the sweet spot for voice; 128-192 kbps stereo for music captures.
3. Set Sample Rate, Channels, and Trim (Optional): Choose 48000 Hz to preserve Opus's native rate exactly, or downsample to 16000/22050 Hz for voice. Pick mono or stereo — mono cuts file size roughly in half and matches WhatsApp/Discord voice-note sources. Optionally trim with start time and duration in seconds or HH:MM:SS.sss to cut a single segment from a longer recording.
4. Convert and Download: Click Convert. Files process in your browser session and download individually or as a ZIP — no sign-up, no watermark.

Why Convert WEBA to M4A?

WEBA is the audio-only variant of WebM — an Opus or Vorbis stream wrapped in a Matroska-derived container. It shows up wherever browsers touch audio: MediaRecorder captures from web apps, Discord and WhatsApp voice notes saved from their desktop/web clients, yt-dlp rips of YouTube, and Web Audio API exports. M4A is Apple's preferred audio container — an MPEG-4 wrapper around AAC introduced with iTunes in 2001. The reason to convert WEBA → M4A is almost always Apple compatibility, since iOS, iTunes, and Apple Music refuse to play .weba files natively:

• iPhone, iPad, and Apple Watch playback — iOS has no built-in WebM/Opus support outside Safari 17+. Voice Memos, Apple Music, the Files app preview, and CarPlay all expect M4A/AAC. Converting once means the file opens with a tap on every Apple device.
• Forwarding voice notes to iPhone users — WhatsApp Web and Discord export voice messages as .weba (Opus inside WebM). Email or AirDrop a .weba to an iPhone user and it won't play. M4A plays everywhere on iOS without a third-party app.
• iTunes / Apple Music library import — iTunes refuses to import .weba files (the import dialog silently skips them). M4A imports cleanly with metadata, the file appears in playlists, and syncs across devices via iCloud Music Library.
• iMovie, GarageBand, Final Cut, Logic Pro — Apple's creative apps accept M4A/AAC natively but reject WebM audio on import. Converting once unlocks the entire Apple media-creation workflow for podcast clips, voiceovers, and game audio.
• Discord recording exports — Craig and other Discord recording bots can export per-user tracks as Opus-in-WebM. Re-encoding to M4A makes those tracks editable in Logic Pro / GarageBand and importable to podcast hosting platforms.
• AAC-preferring Bluetooth headphones and car stereos — AirPods and many newer head units decode AAC natively over Bluetooth (better sound than the SBC fallback). An M4A streams at full quality where a .weba file has to be transcoded by the phone first.

If you want a more universal target instead of Apple-specific, see WEBA to MP3; for an editing-grade target see WEBA to WAV.

WEBA vs M4A — Format Comparison

Source Bitrate Quick Guide (What's Inside Your WEBA)

If you don't know what's inside, 128 kbps stereo AAC is a safe universal default and yields files about 20% smaller than 128 kbps MP3 at the same perceived quality.

AAC Bitrate Choice (Inside the M4A)

Frequently Asked Questions

Will my WhatsApp Web voice notes convert correctly to M4A?

Yes. WhatsApp Web saves voice messages as Opus inside a WebM container with the .weba extension. The converter decodes the Opus stream and re-encodes to AAC inside an M4A wrapper. Since voice notes are mono and recorded around 24 kbps, 64-96 kbps mono AAC is the right target — picking 320 kbps just makes the file larger without adding any quality back. The resulting M4A plays natively in iPhone Voice Memos, Apple Music, iMessage attachments, and CarPlay.

Will I lose quality converting WEBA to M4A?

Some loss occurs because both Opus/Vorbis (inside WEBA) and AAC are lossy codecs — you're transcoding lossy → lossy. At 192-256 kbps AAC the loss is inaudible to almost everyone, even on good headphones. For voice notes (where the WEBA source is already 24-48 kbps), there's no audible difference between 64 kbps mono AAC and 256 kbps — the source quality caps what's recoverable. Match or modestly exceed the source bitrate; don't try to "upgrade" by picking a much higher rate.

Why can't iPhones play WEBA files natively?

iOS and macOS Music/Voice Memos/Files don't ship WebM container support. Safari 17 (iOS 17, macOS Sonoma) added Opus playback inside the browser, but the rest of the system still refuses .weba. Third-party apps like VLC for iOS will play them, but Apple Music, Voice Memos, the Files app preview, iMessage, and CarPlay all reject the format. Converting to M4A is the only way to get one-tap playback across the Apple stack.

What sample rate should I pick for an Opus WEBA?

48000 Hz. Opus internally always operates at 48 kHz — even when the source was recorded at 16 kHz (WhatsApp voice) or 44.1 kHz, the codec resamples internally. Picking 48 kHz on output skips an unnecessary resampling step. For voice-only sources where you want a smaller file, 16000 or 22050 Hz mono is fine — speech is intelligible far below 48 kHz.

Should I pick CBR or VBR for AAC?

VBR (variable bitrate) spends more bits during complex passages and fewer during silence — better quality-per-byte at the same average rate, ideal for music. CBR (constant bitrate) has predictable file size and is required by some podcast hosts (Apple Podcasts accepts both, but a few legacy aggregators still want CBR). For WhatsApp/Discord voice notes or audiobooks, CBR mono at 64-96 kbps is the cleanest default. For music going into your iTunes library, VBR at the equivalent of ~190 kbps matches Apple's iTunes Plus standard.

Does this work for Vorbis-in-WEBA as well as Opus-in-WEBA?

Yes. The converter detects the codec inside the WEBA container automatically and decodes either Opus or Vorbis to PCM, then re-encodes to AAC inside the M4A wrapper. Modern Chrome/Firefox MediaRecorder and yt-dlp default to Opus; older browser captures and a handful of legacy web apps still emit Vorbis. Both decode cleanly.

Can I trim part of a WEBA recording before converting?

Yes. Use the trim section to enter a start time and duration. Both fields accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Useful for pulling a single sentence from a long voice note before forwarding to a non-WhatsApp user, isolating one speaker's segment from a Discord recording, or cutting a single song from a YouTube concert rip. Trim runs before AAC encoding so you don't pay the encoding cost on parts you discard.

Will track titles and tags transfer from WEBA to M4A?

Often, yes. WEBA uses Matroska-style tags; M4A uses MPEG-4 atoms. Common fields — title, artist, album, year, track number — map across when present. Embedded album art transfers when the WEBA carries it. WhatsApp, Discord, and MediaRecorder voice notes don't write meaningful metadata, so the resulting M4A won't either, which is normal and expected.

Should I pick AAC or ALAC inside the M4A?

AAC (Advanced Audio Coding) is lossy and produces typical music-sized files (3-6 MB for a 3-minute track). It's what you want for everyday listening, podcasts, and Apple Music compatibility. ALAC (Apple Lossless) is mathematically lossless. Since your WEBA source is already lossy (Opus or Vorbis), ALAC just preserves the lossy artifacts in a much larger file — there's no archival benefit. For any WEBA source, AAC is the right answer; pick the bitrate based on whether the source is voice or music.