3GP to 3GP Converter

Re-encode 3GP to 3GP: When and Why

Converting 3GP to 3GP is a same-format re-encode, not a rename or a stream copy — xconvert decodes the video and audio and rebuilds a fresh 3GPP file at the settings you choose, so the picture and sound are regenerated at the preset you pick. This page is for anyone who needs to do one of three specific jobs with a .3gp clip: shrink an oversized file, re-save a glitchy or partially corrupt recording into a clean container, or swap the codecs so a picky old handset will finally play it. What it will not do is add quality — a re-encode can only preserve or reduce the detail the phone originally captured, never restore it.

How to Convert 3GP to 3GP

1. Upload Your 3GP File: Drag and drop your .3gp (or .3g2) clip onto the page, or click "+ Add Files" to browse. You can queue several clips and re-encode them with the same settings.
2. Pick a File Compression Mode: Under File Compression, leave the Quality Preset on "Very High (Recommended)" for a clean re-encode, or switch to Specific file size to cap the output in MB, Constant Bitrate / Variable Bitrate to pin a data rate, or Constant Quality for a consistent visual result. The mode you pick is what shrinks (or preserves) the file.
3. Normalize Codecs or Resolution (Optional): In Advanced Options, set the Video Codec (defaults to H.264; choose H.263 or MPEG-4 Part 2 for a genuinely old phone) and Audio Codec (defaults to AMR-NB). Use Preset Resolutions to downscale to 240p or 144p, or Trim to keep only a time range.
4. Convert and Download: Click "Convert" and download your 3GP. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically a few hours later. No sign-up, no watermark.

Walk-through: Choosing a Compression Mode and Codecs

Because this is a re-encode rather than a stream copy, every setting under File Compression actually changes the bytes that come back — there is no "lossless" path when you stay in 3GP. Match the mode to the job:

• To shrink an oversized 3GP: use Specific file size and enter a target in MB, or Target file size (%) for a predictable fraction of the original. This is the most direct lever for hitting an email or MMS cap.
• To keep it playable on the same old handset: leave the Video Codec on H.263 (or MPEG-4 Part 2) and the Audio Codec on AMR-NB, and set a small Preset Resolution like 240p — the pairing first-generation 3G phones actually decode.
• To normalize a codec mismatch for a picky device: set the Video Codec to H.264 and the Audio Codec to AAC. A newer phone or car head unit that rejected an H.263/AMR clip will often accept the same footage re-wrapped with these streams.
• To re-save a glitchy clip: keep the Quality Preset on Very High and re-encode straight through — rebuilding the container and index from a clean decode pass can fix seek and playback stutters that a copy would carry over.
• To keep voice intelligible: AMR-NB is a narrowband speech codec tuned for 8 kHz, so it is the right default for interviews and voice memos. Switch the Audio Codec to AAC-LC only when the clip has music or ambient sound worth preserving — a modern player will decode AAC inside a 3GP, but a first-generation handset may not.
• To cut length: open Trim, switch from "Unchanged" to "Time Range", and set start and duration to export only the segment you need.

3GP Output Codecs at a Glance

H.264 was added by later revisions of the 3GPP TS 26.244 specification, so an H.264 3GP plays on most 3G-era and newer phones. The original baseline used H.263 or MPEG-4 Part 2 video with AMR-NB audio — the safest pairing when the target is a genuinely old handset.

Common Errors and How to Fix Them

• Output looks blocky or pixelated after shrinking — you targeted a file size below what the resolution and length can carry. 3GP from old phones is already low-bitrate, so pushing Specific file size far below the source forces heavy compression. Raise the target or the Quality Preset, or downscale the resolution instead of crushing the bitrate.
• File still won't play on the target device — the device likely wants the original mobile codecs. Set the Video Codec to H.263 and the Audio Codec to AMR-NB, and drop to a 176×144 or 320×240 Preset Resolution.
• Audio plays but there's no picture (or vice versa) — usually a partially corrupt source stream the decoder couldn't read. Re-encode once more; if the track still fails, rescue the good stream by extracting audio with 3GP to MP3 or moving to a cleaner container.
• The output is larger than the original — a genuine same-format trap. Re-encoding a low-bitrate H.263 clip to H.264 at the Very High preset can spend more bits than the source ever used. If you want it smaller, switch to Specific file size or Target file size (%) rather than relying on the Quality Preset, which optimizes for quality, not size.
• The clip reports the wrong length or seeks poorly — old-phone recordings often ship with broken timestamps or a missing duration. A straight re-encode rewrites the timing from scratch, which usually restores a correct length and a working seek bar.
• "File is too large to send" — trim before you compress. Cutting a 2-minute clip to 30 seconds removes ~75% of the size before any quality change, which beats lowering the preset.

When This Doesn't Work

A re-encode can rebuild a container, but it cannot recover data that was never there or is locked away. DRM-protected clips (older operator downloads that used OMA DRM) will not decode, and a file whose header or index (the moov atom) is truly damaged may refuse to open at all — re-encoding a file that won't decode produces nothing usable. For general modern playback, a same-format re-encode is also the wrong tool: convert 3GP to MP4 gives you the near-universal container that phones, editors, and browsers expect, and if you only need the file smaller, compress 3GP keeps the same container with the compression controls up front.

3GP Output Codecs on This Page

Both defaults come straight from the 3GPP spec's own recommendations for maximum handset compatibility — the same H.264 + AMR-NB pairing the MP4 to 3GP page produces.

Frequently Asked Questions

Why would I convert 3GP to 3GP at all?

Because "same format" does not mean "same file." A 3GP-to-3GP pass is a real re-encode, so it lets you shrink an oversized clip, downscale the resolution, trim it, or swap the internal codecs — all while keeping the .3gp extension a legacy device expects. If you do not need any of those changes, there is no reason to run it; a plain copy would be identical.

Will re-encoding 3GP to 3GP improve the quality?

No — re-encoding is lossy, so at best the output matches the source and at worst it loses a little detail. There is no way to add sharpness that a low-resolution 3G phone never recorded. In our testing, re-encoding a small 320×240 clip at the Very High preset changed the file size by only a few percent and left no visible difference on a phone-sized frame; forcing it well below the original with the Specific file size mode is where blocking starts to show on motion.

Can this repair a corrupt or glitchy 3GP file?

Sometimes. Re-encoding rebuilds the container, index, and timestamps from a fresh decode pass, which can fix playback stutter, bad seeking, or a clip that only plays part-way. What it cannot do is invent data that is missing — if the video track itself is damaged or the file's header is destroyed, the decoder has nothing to work from. Try the re-encode first; if it fails, the source is likely too damaged to salvage this way.

Which codecs does the 3GP output use?

By default the output is H.264 video with AMR-NB (narrowband speech) audio, held in a 3GPP container per TS 26.244. That pairing plays on most 3G-era and newer handsets. For an older phone that predates H.264, open Advanced Options and set the Video Codec to H.263 or MPEG-4 Part 2; switch the Audio Codec to AAC-LC if the clip is music rather than voice, or AMR-WB for wideband speech.

Should I just convert to MP4 instead?

For almost any modern use, yes. MP4 shares the same ISO base media container as 3GP but is supported near-universally by phones, TVs, editors, and browsers, so 3GP to MP4 is the better target unless you specifically need the .3gp file for a legacy handset, an old car head unit, or a system that only accepts the 3GPP container. Stay in 3GP only when the target device requires it.

What is the difference between 3GP and 3G2?

They are sibling containers from two different standards bodies: 3GP comes from 3GPP (TS 26.244, the GSM/UMTS world), while 3G2 comes from 3GPP2 (C.S0050, the CDMA world — older Verizon/Sprint-style networks). The internals are nearly identical ISO base media boxes, and this converter accepts both, but a handset that demands one extension often refuses the other — so match the extension to what the device shipped with.

How do I shrink a 3GP that is too big to send?

Use the Specific file size mode: enter the target (for example a messaging cap), and the encoder picks a bitrate to land near it, downscaling with Auto Scale if needed. For a gentler touch, drop the Quality Preset a notch or pick a lower Preset Resolution — QCIF-era source video rarely benefits from anything above 480p anyway. Trimming dead footage first with the Time Range option saves more than any quality setting, because cut footage is never encoded at all.

How are my uploaded files handled?

Your file is uploaded over an encrypted connection, re-encoded on our servers, and returned to you for download. Uploads and results are deleted automatically a few hours after conversion — no sign-up, no watermark, and your files are never shared or made public. The main practical limit on a large clip is upload time, not your device.