Is this WAV to OPUS converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple WAV files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

What bitrate will the converted audio use?

We default to 192 kbps for MP3, 128 kbps for OGG/Opus, and 320 kbps for M4A/AAC. These settings are perceptually transparent — most listeners can't tell the difference in a blind test.

Will my metadata (ID3 tags, album art) be preserved?

Yes, when both formats support it. Tags carry over on conversions like MP3→M4A or FLAC→MP3. WAV has limited tag support, so some metadata may not transfer.

At what bitrate should I encode WAV to Opus?

For music, 96–128 kbps Opus is perceptually transparent. For voice-only content (podcasts, voice memos), 32–48 kbps is sufficient and sounds excellent.

Is Opus supported in browsers for web audio?

Yes — all major browsers support Opus playback via the Web Audio API and HTML5 element. It's the recommended format for WebRTC voice and audio streaming.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

WAV to Opus Converter — Free, Online, No Upload

How to convert WAV to OPUS online

1
Drop your WAV file
Drag and drop your Waveform Audio File Format file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Waveform Audio File Format → Opus Interactive Audio Codec entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your OPUS
Your Opus Interactive Audio Codec file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

WAV vs OPUS: format overview

WAV

Waveform Audio File Format

Microsoft and IBM · 1991

Compression: none
Transparency: No

✓ Lossless — no quality degradation
✓ Universal DAW compatibility for production
✗ Extremely large file sizes

OPUS

Opus Interactive Audio Codec

IETF / Xiph.Org · 2012

Compression: lossy
Transparency: No

✓ Best low-bitrate quality of any audio codec
✓ Royalty-free and open standard (RFC 6716)

WAV magic bytes: 52 49 46 46 xx xx xx xx 57 41 56 45

OPUS magic bytes: 4F 67 67 53 (Ogg container)

Why convert WAV to OPUS?

WAV at CD quality uses about 1,400 kbps of bandwidth — which is fine for a local hard drive but completely impractical for streaming, WebRTC, or anything delivered over a network. When the audio needs to travel in real time — voice calls, live streaming, browser-based audio playback — the source format needs to change.

Opus was specifically engineered for this problem. At 64 kbps, Opus sounds as good as a 128 kbps MP3. At 96 kbps, it's perceptually transparent for music in most listening conditions. For voice-only content — podcasts, voice memos, narration — 32 kbps Opus sounds excellent. This makes WAV-to-Opus the right conversion for web audio delivery, embedding audio in PWAs, WebRTC applications, and anywhere bandwidth efficiency matters. Discord, WhatsApp, and Zoom all use Opus internally for exactly this reason. All major browsers support Opus playback via the Web Audio API and HTML5 audio element natively.

Because WAV is lossless, the Opus encoder gets clean source audio — this is the best possible starting point for an Opus encode. The resulting file will be 95% or more smaller than the WAV source. The only limitation is platform support: iTunes and Apple Music don't handle Opus natively, so M4A or MP3 remains the better choice for Apple-centric workflows. For everything web-facing, Opus is the right call.

Quality & file size: WAV to OPUS

Typical file sizes: WAV 30–50 MB → OPUS 1–3 MB.

Both WAV and OPUS use lossy compression. We transcode at high quality settings (equivalent to OPUS's recommended web quality) to minimize generational loss.

Color depth: WAV supports standard color, OPUS supports standard color.

Transparency: WAV does not support transparency. OPUS does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WAVfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.