Convert 3GP to captions

Sonix transcribes your 3GP file and creates closed captions that make your content accessible to everyone.

ADA compliant
5-min turnaround
Accessible
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding 3GP files

What is a 3GP file?

Mobile video format optimized for MMS and cellular networks

The 3GP file was created by the 3rd Generation Partnership Project Group (3GPP). It is primarily designed for transmitting multimedia files taken by cell phone videos and sending them over the Internet.
3GP is the required, standard format for media files sent using Multimedia Messaging Service (MMS) and Multimedia Broadcast Multicast Services (MBMS). Thus, the 3GP video container format was developed with the intention to save on disk space, bandwidth, and data usage, which is why they're often seen created from, and transferred between, mobile devices.

Common Uses

  • Cell phone video recordings
  • MMS multimedia messages
  • Low-bandwidth video streaming

Audio Quality

Highly compressed for mobile; audio quality may be limited

Transcription Tips for 3GP

  • Convert to MP4 for better processing if quality allows
  • Audio quality varies significantly by device

Where 3GP Files Come From

  • Older smartphones
  • Feature phones
  • MMS applications
10x
Faster than real-time
Get your 3GP captions in minutes
99%
Accuracy rate
Industry-leading AI for 3GP files
53+
Languages
Captions in any language
30+
Export formats
SRT, VTT, and TTML
How It Works

Create captions from 3GP in 6 steps

Step 1

Create account

Sign up for Sonix's free trial. Includes 30 minutes free.

Step 2

Upload file

Upload your 3GP file from your computer or cloud storage.

Step 3

Select language

Choose from 54+ languages spoken in your file.

Step 4

Auto-transcribe

Sonix AI transcribes your 3GP with word-level timestamps.

Step 5

Edit captions

Fine-tune timing and formatting for accessibility.

Step 6

Export

Download closed captions in SRT and VTT formats.

Common Questions

Everything about 3GP captions

Can you create closed captions from 3GP files?

Yes! Sonix transcribes your 3GP file with precise timestamps and creates closed captions in standard formats.

What's the difference between subtitles and closed captions?

Closed captions include non-speech elements like [music], [applause], and speaker identification. They're designed for deaf and hard-of-hearing viewers.

Are Sonix captions ADA compliant?

Yes! Sonix captions meet accessibility requirements when properly reviewed and edited. Our editor helps ensure timing and accuracy standards.

What caption formats are supported?

Export captions as SRT, VTT, or TTML. Each format has specific use cases.

Can I add sound descriptions?

Yes! Use our editor to add [music], [laughter], and other non-speech descriptions for full accessibility.

Do captions help with SEO?

Absolutely! Captions make your video content searchable and improve accessibility, both of which can boost SEO rankings.

Why Sonix

Accessible captions from 3GP files

Accessibility First

Create captions that make your content accessible to deaf and hard-of-hearing viewers.

ADA Compliant

Meet accessibility requirements with properly formatted closed captions.

Sound Descriptions

Add non-speech elements like [music] and [applause] for full context.

SEO Benefits

Captions make video content searchable and improve discoverability.

Related

More ways to convert 3GP files

Other 3GP conversions

3GP to Text

Convert now

3GP to PDF

Convert now

3GP to DOCX

Convert now

3GP to SRT

Convert now

3GP to VTT

Convert now

3GP to Subtitles

Convert now

Add Subtitles to 3GP

Convert now

Other file formats

RM to text
WMV to text
MPG to text
OGX to text
AVI to text
WEBM to text
MXF to text
M2V to text
VOB to text
MK3D to text
See all supported file formats
Reviews

Trusted by accessibility teams

4.98 rating from 211 reviews

Time is money, and that is exactly what Sonix is saving. Time! So it's worth every penny!!
PW
Patrick W.
Fredericksberg, Denmark
Fast, easy transcription. Also the ability to edit in the software with the recording before exporting is a great feature. I have already recommended you to a friend.
SK
Sam K.
Miami, FL USA
This is the best software I've used for transcription. Really happy about that!
LP
Lakshmi P.
Bengaluru, India
I LOVE Sonix. It's saving my life. I'm working on a project with almost NO budget, interviewing a bunch of people and the Sonix transcriptions are accurate, and are so easy and int...
NS
Nelson S.
Brooklyn, NY USA
I am completely blown away by this platform. I am already telling everyone about it!
DA
Douglas A.
Tillamook, OR, USA
Sonix is a very user-friendly platform, and they are very transparent about what is included in the monthly fee... It's transcribed very fast and is quite ...
CM
Chrissy M.
Portland, OR, USA
I was cleaning up the transcription of the recording of my Brazilian client. Sonix did a surprisingly good job. Sonix's accuracy in transcription is great.
LH
Laurence H.
New York, NY USA
The transcript came through almost word perfect from a video file. Your system is absolute MAGIC!
BS
Brian S.
Cheltenham, United Kingdom
Read more testimonials
Get Started

Create 3GP captions now

Try Sonix free with 30 minutes of transcription. No credit card required.

99% accuracy. Every word matters.

AI transcription and translation in 54+ languages.

Product
TranscriptionTranslationSubtitlesAI Analysis
Solutions
EnterpriseHealthcareLegalEducation
Resources
PricingAPI DocsSecurity FeaturesContact
Let our support team help you with all of your automated transcription questions. Pictured: Christine Lee

Need help getting started?

Browse our Help Center , tutorials , and video guides .

Visit Help Center
Popular Resources
How to record a google meetWhat is a m4a fileHow can I add subtitles to my video easily?How to record a phone callHow to convert mp3 to text?What does a transcriptionist do?