Trim OGG — Free Online Tool
Trim an OGG audio file to a precise start and end point, preserving your existing Vorbis, Opus, or FLAC stream without re-encoding. This tool cuts OGG containers with stream copying, so there is no quality loss and processing is near-instant even for large files.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
When trimming an OGG file, FFmpeg seeks to the specified start timestamp and copies the audio stream bytes directly into a new OGG container without decoding or re-encoding. Because OGG uses page-based framing, the cut happens on the nearest Ogg page boundary to your specified timestamps rather than at a perfectly exact sample boundary — this is a property of the OGG container format itself. For Vorbis and Opus streams (which are lossy), this stream-copy approach means no additional generation loss is introduced. For FLAC-in-OGG streams, the lossless audio data is preserved bit-for-bit within the trimmed segment. Metadata tags embedded in the OGG headers are carried over to the output file.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary. In the browser-based version of this tool, FFmpeg runs as a WebAssembly module (FFmpeg.wasm) entirely within your browser — no file data is sent to a server. |
-i input.ogg
|
Specifies the input OGG file. FFmpeg reads the Ogg page structure to identify the audio codec (Vorbis, Opus, or FLAC) and parse the stream headers before processing begins. |
-ss 00:00:00
|
Sets the trim start point to the beginning of the file (00:00:00). Placed before -i, this uses fast input-seeking to jump directly to the nearest Ogg page boundary at or before the specified timestamp, making it efficient even for large files. |
-to 00:00:10
|
Sets the trim end point to 10 seconds into the file. FFmpeg stops reading and writing stream data at the Ogg page boundary nearest to this timestamp. Change this value to any HH:MM:SS timestamp to adjust the length of your trimmed clip. |
-c copy
|
Instructs FFmpeg to copy all streams (audio, and any other logical bitstreams present) without decoding or re-encoding. This preserves the original Vorbis, Opus, or FLAC quality exactly, and makes trimming nearly instantaneous regardless of file size. |
output.ogg
|
Specifies the output filename with the .ogg extension, telling FFmpeg to write the trimmed data into a new OGG container. The output retains the same codec, quality level, and metadata as the input. |
Common Use Cases
- Cut a long Vorbis music recording down to a specific song or movement without re-encoding and degrading the lossy audio quality
- Extract a clean segment from an Opus voice recording — such as a single interview answer — for use in a podcast or audio collage
- Remove silence or unwanted intro/outro sections from an OGG audiobook chapter before distribution
- Trim a FLAC-in-OGG lossless archive recording to isolate a specific performance passage while keeping it fully lossless
- Prepare a short OGG audio loop from a longer source file for use in a browser-based game, since OGG Vorbis has broad HTML5 audio support
- Extract a ringtone-length clip from an OGG music file to stay within mobile platform size limits
Frequently Asked Questions
No. The -c copy flag instructs FFmpeg to copy the existing Vorbis, Opus, or FLAC audio stream directly without decoding or re-encoding it. Because no additional lossy compression pass is applied, the trimmed segment is bit-for-bit identical to the corresponding portion of the original file. The only caveat is that the cut point is snapped to the nearest Ogg page boundary rather than an exact sample, which may introduce a few milliseconds of imprecision at the very start or end of the clip.
OGG is a page-based container format — audio data is grouped into Ogg pages that typically span several milliseconds each. When using stream copy (-c copy), FFmpeg cannot cut in the middle of a page, so the trim points are rounded to the nearest page boundary. For most use cases (music clips, podcast segments) this is imperceptible. If you need sample-accurate trimming, you would need to re-encode the stream, which will introduce one additional lossy compression pass for Vorbis or Opus.
Modify the values after -ss and -to in the command. Both flags accept timestamps in HH:MM:SS format or plain seconds (e.g., -ss 30 -to 90 trims from 30 seconds to 90 seconds). You can also replace -to with -t to specify a duration instead of an end time — for example, -ss 00:01:00 -t 00:00:30 extracts 30 seconds starting at the one-minute mark. When -ss is placed before -i as in this command, FFmpeg uses fast keyframe-level seeking, which is efficient but means the start point snaps to a page boundary.
Metadata tags (artist, title, album, etc.) stored in the Vorbis comment header are preserved during the stream copy. However, chapter markers embedded in the OGG file may be affected by trimming — chapters that fall entirely outside the selected time range are dropped, and the timestamps of remaining chapters are not automatically recalculated relative to the new start point. If accurate chapter navigation in the output file matters, you will need to manually edit the chapter metadata after trimming.
Yes. The command works identically for all three codec types that OGG supports — libvorbis (lossy), libopus (lossy), and FLAC (lossless). The -c copy flag simply passes through whatever audio stream is present without inspecting or altering it. You can confirm which codec your file uses by running ffprobe input.ogg before trimming.
Yes. On Linux or macOS you can use a shell loop: for f in *.ogg; do ffmpeg -i "$f" -ss 00:00:00 -to 00:00:10 -c copy "trimmed_$f"; done. On Windows Command Prompt, use: for %f in (*.ogg) do ffmpeg -i "%f" -ss 00:00:00 -to 00:00:10 -c copy "trimmed_%f". Each file is processed sequentially and the near-instant stream copy speed makes batch jobs very fast even for large collections.
Technical Notes
OGG is a streaming-oriented container, meaning audio data is interleaved in pages with granule position timestamps that drive seeking. When FFmpeg stream-copies a trimmed segment, the granule positions in the output pages are adjusted so playback starts correctly from position zero, ensuring compatibility with players that rely on these timestamps for seeking. The Vorbis codec stores a codebook in the stream header; because stream copy preserves the original header pages, the output file remains fully decodable by any standard Vorbis player. Opus streams in OGG follow RFC 7845, which specifies a pre-skip value in the header; stream copying preserves this value correctly. FLAC-in-OGG follows a slightly different page structure than native FLAC files, but FFmpeg handles this transparently. One known limitation: very precise sample-accurate editing requires re-encoding, at the cost of one additional lossy generation for Vorbis and Opus (FLAC remains lossless regardless). Multiple audio tracks within a single OGG file (multiplexed logical bitstreams) are all copied when using -c copy, preserving the multi-track structure in the output.