Cut Opus

How to Cut Opus Audio Online

1. Upload Your Opus File: Drag and drop or click "Add Files" to select your .opus audio. The cutter accepts WhatsApp, Discord, and Telegram voice exports as well as Opus tracks ripped from YouTube or generated by web recorders. Batch trimming is supported — queue multiple files and apply different cut points to each.
2. Set Start Time and Duration: Under Audio Trim, enter a Start value (default 0) and a Duration value (default 10 seconds). Both fields accept plain seconds (e.g. 12.5) or HH:MM:SS.sss (e.g. 00:01:32.250). The output keeps everything between Start and Start+Duration; everything outside the window is dropped.
3. Adjust Codec, Bitrate, Sample Rate, or Channel (Optional): Expand Advanced Options to change Audio Codec (Opus is the default; AAC, FLAC, MP3, Vorbis, and PCM are also available if you want to re-encode while you cut), Constant Bitrate (8–510 kbps; 64 kbps default), Audio Sample Rate (8000, 12000, 16000, 24000, 44100, or 48000 Hz), or Audio Channel (Mono, Stereo, or Original). Leave these alone to keep the source codec untouched and produce a stream-copy cut with no quality loss.
4. Cut and Download: Click "Cut". Files process on our edge servers, then download as .opus. No sign-up, no watermark, and no email gate.

Why Cut Opus Files?

Opus is the default voice codec for WhatsApp, Discord, Telegram, and WebRTC, and it powers most modern in-browser audio recorders. Voice notes and screen-recorded audio frequently arrive as long, single-take .opus files where only one stretch in the middle matters. Trimming on-device avoids re-encoding overhead and keeps the codec's low-bitrate efficiency intact.

• Pull a quote from a voice memo — A 4-minute Discord or WhatsApp voice message often contains one 20-second insight worth saving or forwarding. Cutting in the browser preserves the original Opus stream so the recipient hears the same audio they would have heard inside the chat app.
• Clip a podcast highlight — Opus is increasingly used by podcast publishers for low-bandwidth distribution (the IETF defines Opus for both speech and music in RFC 6716). Pulling a one-minute segment for a social share or transcript footnote is a one-step cut.
• Remove silence at the head or tail of a recording — Browser-based voice recorders often capture 1–3 seconds of dead air before the speaker starts. Trimming that off shrinks the file and tightens the listening experience without re-encoding.
• Split a long meeting recording — Cut a 90-minute Opus capture from a Google Meet, Jitsi, or BigBlueButton export into per-topic clips for easier review or transcription handoff.
• Prepare a ringtone or notification sound — Modern Android (since Android 10) plays Opus natively for ringtones; cut a 5–15 second slice and drop it directly onto the device.
• Fix an over-long voice note before forwarding — WhatsApp and Telegram both deliver voice messages as Opus-in-Ogg. Cutting before re-sharing saves bandwidth on the recipient side and avoids the awkward 4-minute scrub bar.

Opus vs Other Audio Formats — Quick Comparison

Property	Opus	MP3	AAC	OGG Vorbis
Standardized	IETF RFC 6716 (2012)	ISO/IEC 11172-3 (1993)	ISO/IEC 14496-3 (1997)	Xiph.Org (2000)
Bitrate range	6–510 kbps	8–320 kbps	8–529 kbps	~32–500 kbps
Sample rates	8 / 12 / 16 / 24 / 48 kHz	8–48 kHz	8–96 kHz	8–192 kHz
Latency floor	5 ms	~50 ms	~20 ms	~30 ms
Voice quality at 24 kbps	Excellent	Poor	Fair	Fair
Music quality at 96 kbps	Excellent	Fair	Good	Good
License	Royalty-free	Royalty-free since 2017	Patented (royalties may apply)	Royalty-free
Browser support	Chrome, Firefox, Edge, Safari 11+	Universal	Universal	Chrome, Firefox, Edge

Opus wins decisively at low bitrates and for real-time voice; MP3 and AAC remain better choices when the destination device or workflow specifically requires them.

Bitrate Guide for Cut Opus Output

Use case	Recommended bitrate	Notes
Voice memo / podcast speech (mono)	24–32 kbps	Indistinguishable from source for human voice
Stereo music (background, podcast intros)	64–96 kbps	Transparent for most listeners
High-fidelity music	128–160 kbps	Audiophile-grade Opus stereo
Archival / mastering	192–256 kbps	Use only if downstream tools demand headroom
Re-encoding to a different codec	Match source ±10%	Avoid raising bitrate; you cannot recover detail

If you do not need to re-encode, leave Audio Codec on its default and the cut will be a stream copy — bit-exact within the kept range.

Frequently Asked Questions

Will cutting an Opus file lose audio quality?

If you keep Audio Codec on the default (Opus passthrough) and do not change Bitrate or Sample Rate, the cutter performs a stream copy and the output is bit-exact for the kept range. Quality only degrades if you switch the output codec or force a different bitrate, which triggers a re-encode.

My WhatsApp voice message ends in .opus but Telegram exports .ogg — can I cut both here?

Yes. WhatsApp delivers Opus inside an Ogg container with the .opus extension; Telegram uses the same Opus-in-Ogg encoding but conventionally writes .ogg. The cutter accepts the .opus extension directly. For Telegram's .ogg voice notes, use the OGG cutter — it handles the same underlying Opus stream.

What is the maximum file size or duration I can cut?

There is no hard duration limit imposed by the format; Opus packets can be combined into arbitrarily long files. In practice the cutter handles voice memos and podcast episodes up to several hours. Very large files take longer to upload than they do to cut, since trimming a copy at the byte/packet level is fast.

How precise are the start and duration values?

Cuts are accurate to the millisecond in the input field (HH:MM:SS.sss). Internally Opus encodes audio in 2.5 / 5 / 10 / 20 / 40 / 60 ms frames per RFC 6716, so the actual cut snaps to the nearest packet boundary — typically within 20 ms of the requested time. For voice this is imperceptible; for music edits on the beat, allow a small lead-in.

Can I convert the cut clip to MP3 or WAV at the same time?

Yes. Pick MP3, WAV, or another target under Audio Codec before cutting, and the trim and conversion happen in one pass. Or use the dedicated Opus to MP3 or Opus to WAV tools if you want defaults tuned for that target format.

Does the cut Opus play on iPhone and macOS?

Native Opus playback in iOS and macOS arrived with Safari 11 (2017). Files Cut here open directly in QuickTime Player on macOS Big Sur and later, and play in Safari on iOS 11+. Older devices may need to convert to Opus to M4A (AAC inside an MP4 container) for universal Apple compatibility.

Can I cut multiple Opus files at once with different start times?

Yes — drop multiple files into the queue and the cut points apply per file. If you need the same trim across many files (for example, removing the first 3 seconds from a folder of recordings), enter the values once and run them in batch.

Why is my output file slightly larger or smaller than (duration × source bitrate / 8)?

Opus uses variable bitrate by default, so per-second size depends on signal complexity. Silence and unvoiced sections compress aggressively; complex music passages do not. The container also adds a small header (~80 bytes) and per-page overhead in Ogg-wrapped files. Expect ±5–15% versus the naive estimate.

Can I cut with the audio still playing in a preview before exporting?

Use the Opus playback in your browser to scrub and identify timestamps, then enter them in the Start and Duration fields here. For trimming with a visual waveform, the Audio Cutter tool offers a graphical timeline that accepts Opus and writes the same format on the way out.