Is this WEBM 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 WEBM 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.

Is WebM to Opus extraction lossless?

Yes — modern WebM files use Opus audio. Extracting to a standalone .opus file is a container remux with no re-encoding, so quality is bit-for-bit identical to the source.

Where can I use standalone Opus files?

VLC, MPV, Discord, Chrome/Firefox/Edge, Android, and most modern streaming stacks support Opus files. It's not supported by iTunes or the iOS Music app.

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.

WebM to Opus Converter — Free, Online, No Upload

How to convert WEBM to OPUS online

1
Drop your WEBM file
Drag and drop your WebM Video 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 WebM Video 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.

WEBM vs OPUS: format overview

WEBM

WebM Video Format

Google (On2 Technologies) · 2010

Compression: lossy
Transparency: No

✓ Royalty-free codec (VP8/VP9/AV1)
✓ Excellent web streaming support
✗ Not supported on iOS/Safari natively

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)

WEBM magic bytes: 1A 45 DF A3

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

Why convert WEBM to OPUS?

WebM files bundle video and audio together in a single container, and when you only need the audio from a WebM recording — a browser call, a video lecture, a screen capture — carrying the video data is wasteful. Stripping the video and keeping only the Opus audio track gives you a smaller, purpose-built audio file that the browser's audio stack can handle efficiently.

Opus is already the audio codec inside most WebM files, which means converting WebM to Opus often requires nothing more than a remux — extracting the audio stream and placing it in an OGG container without any re-encoding. This preserves the original Opus audio exactly, with no quality loss. The resulting .opus file is the most compact audio format available for the quality it provides.

Opus audio files are natively supported in Chrome, Firefox, and modern Linux media players. They are the native format for Discord, WhatsApp voice messages, and WebRTC systems. If your target is a web app, a communication platform, or an open-source audio pipeline, Opus is the right output. Note that native iOS and older Safari support for Opus is limited — if you need to reach Apple devices, AAC or M4A are better choices. For everything else, this is the most efficient extraction you can do from a WebM file.

Quality & file size: WEBM to OPUS

Typical file sizes: WEBM 50–200 MB → OPUS 1–3 MB.

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

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

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

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WEBMfiles 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.