Free 3GP to MP4 Converter: No Sign-up, Files Never Uploaded
Convert 3GP to MP4 free, right in your browser. There is no sign-up or login, no watermark, and nothing is uploaded: your videos never leave your device.
The video and audio tracks are read, decoded and encoded again for the MP4 container, which takes real work from your processor. MP4 uses lossy compression, so each save trades some detail for a smaller file.
Depending on your browser, this pair can need a conversion engine, a one-time download of about 31 MB. The page shows the size before it starts, and your browser keeps the engine for next time.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Add your 3GP files by dragging them onto the converter or by using the file picker.
- Check that MP4 is the selected target format; it is already chosen on this page.
- Open the options if you want to change resolution, frame rate and quality, or keep the defaults.
- Press Convert and watch the progress shown for each file.
- On the first run the page may pause while the conversion engine downloads.
- Download each result, or take them all together as one ZIP when you converted several files.
Features
- Reads .3gp, .3g2 and writes .mp4.
- Free, with no watermark added to the result.
- No sign-up and no login.
- Your files are never uploaded and never leave your device.
- Batch conversion with a ZIP download for several results.
- The input is recognised by its content, not only by its file name.
- A one-time engine download is cached by your browser.
Supported formats
About the formats
About 3GP
Small-file video container defined by 3GPP for early mobile phones.
Low resolution by design.
About MP4
The most widely supported video format: plays on phones, browsers, TVs and editors.
Usually H.264 video with AAC audio.
Based on Apple’s QuickTime format and standardised by MPEG.
3GP vs MP4
3GP uses lossy compression; MP4 uses lossy compression.
3GP does not support transparency, and MP4 does not.
3GP files use the .3gp extension and MP4 files use .mp4, so the converted file gets a new name with the new extension.
Privacy: how it works
- Your 3GP files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- Some conversions use a WebAssembly engine that your browser downloads once, the first time you need it. Only the engine is fetched, never your file, and the page shows the approximate size before it starts. Your browser caches it, so later conversions skip the download.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
Tips
- Try a short clip first to check quality and size before you convert a long video.
- Keep the original resolution unless you need a smaller file; shrinking the frame is the quickest way to cut size.
- Close other heavy tabs while converting, because the work uses your own memory and processor.
- Convert one large file at a time on a phone or a low-memory computer.
- MP4 uses lossy compression, so each save trades some detail for a smaller file.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your 3GP files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there. Some conversions load a small conversion engine the first time you use them. That download is the only network traffic, it contains no file of yours, and your browser keeps it for next time.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow or fail on a weak phone or an older computer. Close other heavy tabs and convert 3GP files one at a time if a big batch struggles.
What is the difference between 3GP and MP4?
3GP uses lossy compression; MP4 uses lossy compression. 3GP does not support transparency, and MP4 does not. 3GP files use the .3gp extension and MP4 files use .mp4, so the converted file gets a new name with the new extension.
Can I convert many 3GP files at once?
Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.
Will anything be lost when I convert 3GP to MP4?
MP4 uses lossy compression, so each save trades some detail for a smaller file.
Can I convert MP4 back to 3GP?
Yes. Open the MP4 to 3GP page and use the same steps. Converting back does not undo any loss from the first conversion.
Why does 3GP to MP4 download something the first time?
Some pairs use a WebAssembly engine because browsers cannot do the job alone. The engine downloads once, contains none of your files, and is cached afterwards.