Convert STP to 3GP Online
STP and 3GP serve different purposes. Convert STP to 3GP here when you need legacy mobile video, feature-phone recordings.
How to convert STP to 3GP
- Upload your STP file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose 3GP as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert STP to 3GP?
People convert STP to 3GP mainly for compatibility. Widely supported by CAD software. 3GP, by contrast, is built for legacy mobile video, feature-phone recordings, and obsolete on modern phones; convert to MP4 for playback.
STP vs 3GP: key differences
| STP | 3GP | |
|---|---|---|
| File type | CAD | lossy |
| Typical use | engineering CAD, manufacturing | legacy mobile video, feature-phone recordings |
| Compatibility | Widely supported by CAD software. | Obsolete on modern phones; convert to MP4 for playback. |
Tips for a clean STP to 3GP conversion
- Widely supported by CAD software.
- Use the highest-quality source STP you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original STP until you have checked the converted 3GP opens the way you expect.
Frequently asked questions
How do I convert STP to 3GP?
Upload your STP file to the converter on this page, make sure 3GP is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this STP to 3GP converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting STP to 3GP reduce quality?
3GP uses lossy compression, so the converted file is re-encoded. Quality loss is minimal at sensible settings, but keep the original STP if you may need to convert again later.
What is a STP file?
STP is the .stp extension of the STEP CAD exchange format. Its technical name is STEP File and it is typically used for engineering CAD, manufacturing.
What is a 3GP file?
3GP is a low-bandwidth format designed for older mobile phones. Its technical name is 3GPP Multimedia and it is typically used for legacy mobile video, feature-phone recordings.
Can I convert STP to 3GP on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.