Trim 3GP — Free Online Tool
Trim a 3GP video or audio file to a specific start and end time, keeping the original H.264 video and AAC audio streams intact without re-encoding. Ideal for cutting clips from mobile-recorded 3G footage while preserving the compact, low-bandwidth container format.
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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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Settings
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
This tool uses a stream copy operation (-c copy) to extract the specified time range from the 3GP file without decoding or re-encoding the H.264 video or AAC audio streams. FFmpeg simply seeks to the start point (-ss) and reads until the end point (-to), then writes those packets directly into a new 3GP container. Because no re-encoding occurs, the trim is nearly instantaneous and introduces zero additional quality loss — the output is a binary-accurate slice of the original compressed data. Note that because stream copy must align to keyframes, the actual start of the output clip may be adjusted slightly to the nearest keyframe before your requested start time.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary. In this browser-based tool, FFmpeg runs as a WebAssembly module (FFmpeg.wasm) locally in your browser — no file ever leaves your device. |
-i input.3gp
|
Specifies the input 3GP file. FFmpeg reads the 3GP container, identifying the H.264 video stream and AAC audio stream inside, along with the container's total duration and metadata. |
-ss 00:00:00
|
Sets the trim start time to the beginning of the file (00:00:00). Change this timestamp to seek to any point in the 3GP file — FFmpeg will align to the nearest H.264 keyframe at or before this time when using stream copy. |
-to 00:00:10
|
Sets the absolute end point of the trim to 10 seconds into the 3GP file. Unlike -t (which specifies a duration), -to specifies an exact timestamp in the source file, so the output clip will span from the -ss point to this point. |
-c copy
|
Instructs FFmpeg to copy both the H.264 video stream and the AAC audio stream directly into the output 3GP container without re-encoding. This makes the trim near-instant and lossless in terms of quality. |
output.3gp
|
The output filename with the .3gp extension, telling FFmpeg to wrap the copied H.264 and AAC streams in a new 3GP container. The result is a valid 3GP file containing only the trimmed time range, compatible with mobile players and legacy 3G devices. |
Common Use Cases
- Cut a specific moment from a 3GP video recorded on an older Nokia, Samsung, or other 3G-era mobile phone before sharing it online
- Remove dead air or accidental footage from the beginning or end of a 3GP clip captured on a feature phone camera
- Extract a short highlight from a long 3GP sports or event recording to share via MMS or a legacy messaging app
- Trim a 3GP audio recording (e.g., a voice memo saved in 3GP format) to isolate only the relevant spoken content
- Prepare a short 3GP clip for embedding in a mobile web page or streaming over a low-bandwidth 3G connection where file size is critical
- Isolate a specific segment from a 3GP dashcam or security camera recording for evidence or archival purposes
Frequently Asked Questions
No. This tool uses -c copy, which copies the H.264 video and AAC audio streams directly without decoding or re-encoding them. There is no additional generation loss from the trim operation itself. The only quality present in the output is exactly the quality that was already encoded in the original 3GP file.
When using stream copy mode, FFmpeg cannot cut mid-frame — it must start the clip at a keyframe (I-frame) in the H.264 video stream. If no keyframe exists at your exact requested start time, FFmpeg will seek back to the nearest preceding keyframe. This is a fundamental property of H.264 compression in 3GP files and is not a bug. If you need frame-accurate trimming, the tool would need to re-encode the video, which would increase processing time and introduce some quality loss.
Yes. Because the operation is a stream copy, the output 3GP file contains the exact same H.264 video stream and AAC audio stream as the source, at the same bitrate, resolution, and quality settings. No codec conversion takes place; only the container's time range is changed.
Replace the values after -ss and -to with your desired timestamps in HH:MM:SS format or in seconds. For example, to trim from 30 seconds to 1 minute 15 seconds, use -ss 00:00:30 -to 00:01:15. You can also use decimal seconds like -ss 12.5 -to 47.3. The -ss flag sets the start point and -to sets the absolute end point (not a duration).
Yes. On Linux or macOS you can write a shell loop: for f in *.3gp; do ffmpeg -i "$f" -ss 00:00:00 -to 00:00:10 -c copy "trimmed_$f"; done. On Windows PowerShell you can do something similar with a foreach loop. This is especially useful for batch-trimming a folder of 3GP clips from the same event to a uniform length.
Standard 3GP metadata atoms (such as creation time stored in the mvhd box) are generally preserved in stream copy mode because FFmpeg retains the container-level metadata by default. However, some proprietary manufacturer-specific metadata tags embedded by older mobile phones may not survive the remux. If metadata preservation is critical, verify the output with a tool like MediaInfo after trimming.
Technical Notes
3GP is a subset of the MPEG-4 Part 12 container standard, specifically designed for 3G mobile networks, and typically carries H.264 (AVC) video and AAC-LC audio at low bitrates and small resolutions (commonly 176×144 QCIF or 320×240 QGP). Because 3GP shares the same underlying ISO Base Media File Format as MP4, FFmpeg handles it very reliably. The stream copy trim (-c copy) works well here because H.264 and AAC are natively supported in the 3GP container with no codec translation required. One known limitation is keyframe alignment during stream copy, which can cause slight start-point drift as described in the FAQs. The special scaling filter (-vf scale=trunc(iw/2)*2:trunc(ih/2)*2) is defined for this format to ensure dimensions are always even numbers — a requirement of the H.264 encoder — but it is not applied during a stream copy trim since no re-encoding occurs. 3GP does not support embedded subtitles, chapter markers, transparency, or multiple audio tracks, so none of those features are relevant to this operation. File sizes after trimming are proportional to the duration cut: a 10-second trim from a 60-second 3GP file will produce roughly one-sixth the original file size.