Trim 3GPP — Free Online Tool
Trim a 3GPP video or audio file to an exact start and end time — directly in your browser, with no upload required. Uses stream copying to cut your .3gp file without re-encoding, preserving the original H.264 video and AAC audio quality while keeping file sizes small for mobile playback.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your 3GPP file here
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Free — no uploads, no signups. Your files never leave your browser.
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 FFmpeg's stream copy mode (-c copy) to trim your 3GPP file, which means the H.264 video and AAC audio streams are extracted and repackaged into a new .3gp container without any re-encoding. The -ss flag seeks to the specified start point and -to defines the end point, and the output is written with the -movflags +faststart flag so the moov atom is placed at the front of the file — a requirement for progressive streaming on mobile networks and 3G-compatible devices. Because no decoding or encoding occurs, the trim operation is extremely fast and there is zero generational quality loss. Note that because 3GPP video is keyframe-based, the actual cut point may be adjusted slightly to the nearest keyframe when using stream copy, which is standard behavior for this type of operation.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary. In the browser version, this runs via FFmpeg.wasm (WebAssembly), executing the same logic as the desktop FFmpeg CLI entirely within your browser without sending any data to a server. |
-i input.3gp
|
Specifies the input file — your source .3gp file containing H.264 video and/or AAC audio streams in the 3GPP mobile container format. |
-ss 00:00:00
|
Sets the trim start time to the beginning of the file (0 seconds). Placed after -i, this performs a slower but more accurate seek within the 3GPP stream, ensuring the output begins precisely at the nearest keyframe to the specified time. |
-to 00:00:10
|
Sets the trim end point to 10 seconds into the file. The output .3gp file will contain only the content between the -ss start time and this timestamp. To trim to a different end point, replace this value with your desired time in HH:MM:SS format. |
-c copy
|
Instructs FFmpeg to copy all streams (both the H.264 video and AAC audio) without re-encoding. This makes the trim nearly instantaneous and ensures no additional quality degradation occurs in the already-lossy 3GPP streams. |
output.3gp
|
Defines the output filename and container. The .3gp extension tells FFmpeg to write the trimmed streams into a new 3GPP container, maintaining full compatibility with mobile devices, 3G networks, and legacy players that expect this format. |
Common Use Cases
- Trim a 3GPP video recorded on an older mobile phone to remove blank footage at the start or end before sharing via MMS or messaging apps
- Cut a specific highlight clip from a longer 3GP sports or event recording to keep file sizes small enough for 3G network transmission
- Extract a short segment from a 3GPP video captured by a dash cam or security camera that uses the 3GP format natively
- Shorten a 3GPP audio recording (such as a voice memo saved in .3gp format on an Android device) to isolate a specific spoken segment
- Prepare a trimmed 3GP clip for upload to a legacy mobile platform or embedded system that only accepts short 3GPP files with strict duration limits
- Remove unwanted content from a 3GPP file downloaded from an old Nokia or early Android device before archiving or converting it further
Frequently Asked Questions
No. This tool uses -c copy (stream copy mode), which means the H.264 video and AAC audio data inside the .3gp container are not decoded or re-encoded — they are simply repackaged into a new file. This means there is no additional quality loss beyond what already existed in the original lossy 3GPP file. The trade-off is that cut points are snapped to the nearest keyframe, so the trim may be off by a fraction of a second.
When using stream copy mode (-c copy), FFmpeg cannot cut mid-frame — it must align the cut to the nearest keyframe (I-frame) in the H.264 video stream. 3GPP files recorded on mobile devices often have keyframes spaced several seconds apart, so the actual start point may shift by up to a few seconds. If you need frame-accurate trimming, you would need to re-encode the video, which this tool avoids to preserve quality and speed.
Yes. 3GPP supports audio-only files, commonly used for voice recordings on Android and older mobile devices. The -c copy flag copies all streams present in the file — if there is only an AAC or MP3 audio stream and no video stream, the tool will trim and repackage just the audio without any issues. The output will be a valid .3gp audio file.
Yes. The output file retains the same H.264 video and AAC audio codecs as the input, and the -movflags +faststart flag ensures the moov atom is placed at the beginning of the file. This is important for 3G-compatible streaming and progressive playback on mobile devices, as it allows the file to begin playing before it is fully downloaded — exactly how the original 3GPP format was designed to work.
In the FFmpeg command, -ss 00:00:00 sets the start time and -to 00:00:10 sets the end time, both in HH:MM:SS format. For example, to trim from 30 seconds in to 1 minute 15 seconds, you would use -ss 00:00:30 -to 00:01:15. You can also use decimal seconds, such as -ss 00:00:05.500 for a start point at 5.5 seconds. If you want to specify a duration instead of an end time, replace -to with -t followed by the desired duration.
Yes. On the desktop, you can wrap the FFmpeg command in a shell loop to process multiple files. On Linux or macOS, a bash loop such as 'for f in *.3gp; do ffmpeg -i "$f" -ss 00:00:00 -to 00:00:10 -c copy -movflags +faststart "trimmed_$f"; done' will apply the same trim to every .3gp file in a folder. On Windows, a similar FOR loop in Command Prompt or PowerShell achieves the same result. This is especially useful for files over 1GB that exceed the browser tool's processing constraints.
Technical Notes
3GPP (.3gp) is a simplified variant of the MPEG-4 Part 12 container format, originally designed to fit within the constraints of 3G mobile networks — low bandwidth, limited storage, and resource-constrained playback hardware. The format typically carries H.264 (AVC) video encoded with libx264 and AAC audio, both of which are lossy codecs. When trimming with -c copy, no new encoding pass occurs, so CRF and audio bitrate settings are irrelevant — the existing encoded data is preserved exactly. The -movflags +faststart flag reorganizes the container's moov atom to the file header, which is critical for 3GPP files intended for mobile streaming, as players on mobile networks begin buffering from the start of the file. One known limitation of 3GPP is that it does not support subtitle tracks, chapter markers, or multiple audio tracks, so there is no metadata of that kind to preserve or lose during trimming. Because 3GPP files are typically recorded at low bitrates (often under 500 kbps total) for 3G compatibility, the trimmed output files will be proportionally small — a 10-second trim of a typical 3GP file will often be well under 1MB.