Convert 3GP to MKV Online Free
Convert 3GP mobile video files to Matroska MKV format for modern media player compatibility, Kodi libraries, and open-format video archiving. ChangeThisFile handles conversion with FFmpeg on secure servers.
ChangeThisFile converts 3GP to MKV free using FFmpeg on secure servers. Your mobile 3GP uploads with encrypted transfer, converts server-side to Matroska format, and is auto-deleted after download. No signup required — private and completely free.
Convert 3GP to Matroska
Drop your 3GP file here to convert it instantly
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Convert to Matroska instantly
3GP vs Matroska: Format Comparison
Key differences between the two formats
| Feature | 3GP | MKV (Matroska) |
|---|---|---|
| Full Name | 3rd Generation Partnership Project | Matroska Video |
| Designed For | Mobile video sharing | Desktop media archiving |
| Video Codec | H.263, H.264, MPEG-4 | H.264, H.265, VP9, AV1 |
| Audio Codec | AMR-NB, AAC | AAC, FLAC, AC-3, Opus |
| Subtitle Support | None | SRT, ASS, PGS and more |
| File Size | Very small | Varies (quality-dependent) |
| Modern Player Support | Limited | VLC, Kodi, MPC-HC, and more |
| Multi-Track Support | No | Yes |
When to Convert
Common scenarios where this conversion is useful
Kodi and HTPC Media Library
Convert 3GP mobile recordings to MKV for inclusion in Kodi, Plex, or other home theater software that treats MKV as the primary video format.
Long-Term Mobile Video Archive
Preserve old 3GP mobile video recordings in the open Matroska format for better long-term compatibility with modern media players and systems.
Adding Subtitle Tracks
Convert 3GP to MKV to then mux in subtitle files (SRT, ASS) using MKVToolNix, taking advantage of Matroska's superior subtitle capabilities.
Modern Desktop Playback
Move 3GP clips from a phone archive to desktop format by converting to MKV, playable in VLC and most modern media players without plugins.
Consistent Video Library Format
Standardize a mixed collection of 3GP mobile clips into MKV format for organized, consistent library management.
How to Convert 3GP to Matroska
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1
Upload Your 3GP File
Click or drag your 3GP mobile video to the upload area. The file is transmitted to ChangeThisFile's servers using HTTPS encryption.
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2
Server-Side MKV Conversion
FFmpeg processes your 3GP into a Matroska MKV container, transcoding H.263 or H.264 video to H.264 and audio to AAC for modern media player compatibility.
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3
Download Your MKV File
Your Matroska MKV is ready to download when conversion finishes. The original 3GP is permanently deleted from our servers immediately after.
Frequently Asked Questions
MKV is a modern, open container widely supported by VLC, Kodi, and all major media players. Converting 3GP to MKV provides better desktop playback, subtitle support, and future-proof archiving.
The quality is limited by the source 3GP resolution and bitrate. MKV can contain the same data, but converting doesn't add quality that wasn't in the 3GP source.
Yes. Use MKVToolNix or mkvmerge to mux SRT or ASS subtitle files into the converted MKV, which is one of the primary advantages of the Matroska format.
FFmpeg handles H.263, H.264, and MPEG-4 video in 3GP files, along with AMR-NB and AAC audio codecs.
Files up to 50MB are accepted. 3GP files are usually very small, so this is rarely a constraint.
Yes. Uploads are encrypted with HTTPS and files are deleted automatically after your download. No data is retained.
VLC, MPC-HC, Kodi, mpv, PotPlayer, and Windows 11's native player all support MKV natively.
Yes. The output MKV matches the source 3GP resolution and frame rate.
Yes. VLC for Android and iOS can play MKV files. Many modern Android devices also support MKV natively.
Yes. ChangeThisFile is completely free — no accounts, subscriptions, or watermarks.
Related Conversions
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