Does MP4 to 3GP upload my file or text to Tool-You servers?

No. MP4 to 3GP runs in this browser tab. Files stay on the device. Limit note: MPEG-4 video plus mono AAC. QCIF/CIF/VGA optional. Missing muxer fails visibly. Max 100 MB.

Should I use MP4 to WebM instead of MP4 to 3GP?

Use MP4 to 3GP when you need Encode MP4 for older 3GP phones. Use MP4 to WebM when you need Convert MP4 to WebM. They share a category (Video) but not the same job.

MP4 to 3GP

Encode MP4 for older 3GP phones.

Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file.

What MP4 to 3GP does

Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file.

MP4 to 3GP sits in the Video group on purpose. It is not MP4 to WebM (Convert MP4 to WebM.) and not Compress Video (Shrink an MP4 in the browser.). Choose this page when you need Encode MP4 for older 3GP phones. If you stretch MP4 to 3GP into a neighbor’s job, the result will look wrong even though the site chrome looks the same.

How to use MP4 to 3GP

Stay on this MP4 to 3GP page (/mp4-to-3gp). Do not switch to MP4 to WebM unless you actually want Convert MP4 to WebM..
Add the file type MP4 to 3GP accepts. Hint from the path: mp4 to 3gp. Encode MP4 for older 3GP phones.
Set only the options that match MP4 to 3GP. Neighbor Compress Video does something else (Shrink an MP4 in the browser.). Tool note: Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file.
Run MP4 to 3GP in this tab. Browser memory still applies: MPEG-4 video plus mono AAC. QCIF/CIF/VGA optional. Missing muxer fails visibly. Max 100 MB.
Download or copy the result from MP4 to 3GP. If it is the wrong job, open MP4 to WebM instead.

When not to use MP4 to 3GP

Skip MP4 to 3GP when a neighbor tool matches better — start with MP4 to WebM or Compress Video — or when the description already warns the job will fail. In the tool’s own words: Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file.

Questions about MP4 to 3GP

What does MP4 to 3GP do that other Video pages on this site do not?: Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file. Short version: Encode MP4 for older 3GP phones.
Does MP4 to 3GP upload my file or text to Tool-You servers?: No. MP4 to 3GP runs in this browser tab. Files stay on the device. Limit note: MPEG-4 video plus mono AAC. QCIF/CIF/VGA optional. Missing muxer fails visibly. Max 100 MB.
Should I use MP4 to WebM instead of MP4 to 3GP?: Use MP4 to 3GP when you need Encode MP4 for older 3GP phones. Use MP4 to WebM when you need Convert MP4 to WebM. They share a category (Video) but not the same job.
What are the limits of MP4 to 3GP?: MPEG-4 video plus mono AAC. QCIF/CIF/VGA optional. Missing muxer fails visibly. Max 100 MB. Also: Local ffmpeg.wasm encode of MP4 into MPEG-4 + AAC 3GP. Pick QCIF, CIF, VGA, or keep size. If the wasm build cannot mux 3GP, conversion fails instead of faking a file.