WAV to MP3 at 128 kbps. The right size for podcasts, web, email.
If you already know 128 kbps is what you want — podcast upload, web embed, email attachment, voice memo to a friend — this page skips the bitrate menu and just does it. Drop a WAV (or any audio), get back a 128 kbps CBR MP3, no upload.
drop your WAV file
Also accepts FLAC, AIFF, M4A — anything we can decode. Batch supported.
When 128 kbps is exactly right
- Podcast uploads — Most podcast hosts default to 128 kbps stereo or 96 kbps mono. 128 stereo is the safe pick.
- Web embeds — Streaming an MP3 from a website page. Smaller is faster; 128 hits the sweet spot.
- Email attachments — A 20-minute interview at 128 kbps is ~19 MB. Fits Gmail's 25 MB cap with room to spare.
- Voice memos for sharing — Whether through iMessage, Telegram, or just a Dropbox link.
- Audiobook chapters — At 128, an hour is 58 MB. Manageable per chapter on phones.
- Discord uploads on free tier — 128 stereo gives you ~10 minutes under the 10 MB cap. For longer, use our Discord compressor.
When to bump up
- Music meant to be listened to on good headphones — go 192 or 256.
- Demos to a label, DJ pool, mastering engineer — they want 320 or lossless.
- Archive copies — keep the WAV or use FLAC. Don't archive at 128.
When to bump down
- Long-form voice recordings (lectures, sermons, audiobooks) — 96 kbps mono is half the size with no audible loss. Use the compressor.
- Quick voice notes — 64 kbps mono is fine.
FAQ
How much smaller is the MP3?
Roughly 10× smaller than a 16-bit stereo 44.1 kHz WAV. A 5-minute WAV (~50 MB) becomes a 5-minute MP3 (~5 MB) at 128 kbps.
Is 128 CBR the same as 128 VBR?
No. CBR (constant bitrate) keeps the bitrate at exactly 128 the whole way. VBR ("V5" in LAME terms averages around 130 kbps) varies — uses more bits for complex parts. CBR is more compatible with old players and some podcast platforms; VBR is slightly more efficient. This tool outputs CBR.
Will my podcast host re-encode it anyway?
Some do (Spotify normalizes loudness and may re-encode), some don't (most Anchor/Buzzsprout style hosts pass through). 128 is a safe upload regardless — you're handing them a small, broadly compatible file.
Why is the MP3 not labeled "128 kbps" in my player?
It is — but some players show the average bitrate. 128 CBR averages 128. If your tool says "VBR avg 245" that's a different file; check the upload, you might have grabbed the 320 page by mistake.
Can I batch-convert a whole folder?
Yes. Drop multiple files, we'll convert all of them and hand you a zip.
Does anything upload?
No. The encoding runs in WebAssembly in your browser tab.
Why convert WAV to MP3 at 128 kbps specifically?
128 kbps is the unofficial podcast standard, the default for most web embeds, and small enough to attach to emails and DMs without thinking. It's about 1 MB per minute of stereo audio — roughly 1/10th the size of a WAV. For spoken word, it's audibly transparent. For casual music, it's fine.
Is 128 kbps high enough for music?
For casual listening on phone speakers, earbuds, or laptop speakers — yes. For critical listening on good headphones, you might notice slight thinness on cymbals and reverb tails. If you care about that listener, go to 192 or 256 instead.
What's the file size for a 30-minute podcast at 128 kbps?
Roughly 30 MB stereo, 15 MB if you force mono. That fits comfortably under Gmail's 25 MB attachment cap for mono, and most podcast hosts (Anchor, Buzzsprout, Transistor) handle it without trouble.
Why not just use the universal converter?
You can — our /wav-to-mp3 page has the full bitrate menu. This page exists for when you already know 128 is what you want and don't want to pick from a list every time.
Will it work for big WAV files?
Up to about 500 MB per file on a typical laptop. That's roughly 50 minutes of stereo 44.1 kHz 16-bit WAV. For longer recordings, split first with our audio cutter.