Is this OPUS to OGG 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 OPUS 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.

Both Opus and OGG Vorbis use the OGG container — what's different?

The container (.ogg file) is the same, but the codec inside is different. Opus (.opus or .ogg with Opus codec) uses the IETF Opus codec; OGG Vorbis uses the older Xiph Vorbis codec. Some players only recognise one or the other.

Will quality be lost converting Opus to OGG Vorbis?

Yes — both are lossy codecs, so re-encoding causes a small quality reduction. To minimise this, set OGG Vorbis quality high (q7–q8, approximately 224–256 kbps).

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.

Opus to OGG Vorbis Converter — Free, Online, No Upload

How to convert OPUS to OGG online

1
Drop your OPUS file
Drag and drop your Opus Interactive Audio Codec 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 Opus Interactive Audio Codec → Ogg Vorbis entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your OGG
Your Ogg Vorbis file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

OPUS vs OGG: format overview

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)
✗ Not supported on iOS/macOS natively

OGG

Ogg Vorbis

Xiph.Org Foundation · 2000

Compression: lossy
Transparency: No

✓ Royalty-free — no licensing fees
✓ Better quality than MP3 at same bitrate

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

OGG magic bytes: 4F 67 67 53

Why convert OPUS to OGG?

Opus and OGG Vorbis both use the OGG container format, which causes genuine confusion: a file ending in .ogg might contain Vorbis audio or Opus audio, and not every player correctly identifies which is which. Older media players, some game engine audio loaders, and certain streaming tools that were built for Vorbis explicitly may reject or misdecode Opus-in-OGG files. When the target system specifically expects Vorbis — and not just the .ogg extension but the Vorbis codec inside — conversion is the solution.

Game engines are the most common scenario. Unity's audio importer, older versions of Godot, and some audio middleware tools were built around OGG Vorbis specifically. If you have Opus audio from a streaming capture, a Discord export, or a WebRTC recording that needs to be imported as a game audio asset, converting to OGG Vorbis ensures the game engine's importer recognises and correctly decodes the file. Some legacy Android media players and Linux audio libraries that predate widespread Opus adoption also fall into this category.

Both Opus and OGG Vorbis are lossy codecs, so transcoding between them introduces a small quality reduction. Use high OGG quality settings (q7–q8, approximately 224–256 kbps) to keep the impact minimal. If the original uncompressed audio is available, encoding it directly to OGG Vorbis will always produce better results than this route.

Quality & file size: OPUS to OGG

Typical file sizes: OPUS 1–3 MB → OGG 2–5 MB.

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

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

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

Frequently asked questions

Privacy: how FormatDrop handles your files

Your OPUSfiles 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.