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Need help?Re-encode DivX to DivX Online
Converting DivX to DivX is not a copy — it is a fresh encode that happens to land in the same format. People run it for four reasons: to shrink an oversized clip, to swap the audio track to something a player can actually decode, to cut the file down to a time range, or to force a whole folder of mismatched captures onto one set of settings. Upload, choose your settings, download. Free, no sign-up, no watermark; files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours.
The one thing this tool cannot do is give you the original quality back. Our servers always decode and re-encode — there is no stream-copy path — so every DivX-to-DivX job costs you one generation of lossy compression on top of whatever the source already lost.
How to Re-encode a DivX File
- Upload Your DivX File: Drag and drop, or click "+ Add Files" to pick
.divxfiles from your computer. Multiple files are accepted and every one is processed with the same settings, which is exactly what you want when the point of the job is to normalise a batch. - Set the Audio Codec: Video Codec offers a single entry here — DivX — because the target extension pins it. Audio Codec is where the real choice lives, and it defaults to MP3. AC3, EAC3, DTS (DCA), AAC, MP2, FLAC, Vorbis, Speex, WMA v1/v2 and four PCM variants are all in the list. MP3 is the safest pick for old hardware players; AC3 keeps a surround track intact.
- Choose a File Compression Mode: Quality Preset is preselected at "Very High (Recommended)", but read the section below before you trust it on DivX — it is a bitrate multiplier here, not a quality target. Specific file size, Constant Bitrate, Variable Bitrate, Constant Quality and Constraint Quality are the alternatives.
- Resize, Trim, then Convert: Video resolution is set to Keep original; switch it to Resolution Percentage, a Preset Resolution from 4320p down to 144p, or an exact Width x Height. Trim takes a start time and a duration if you only need part of the clip. Click Convert and download.
What a .divx File From This Tool Actually Is
DivX started life in 1999 as a hacked Microsoft MPEG-4 codec and matured into DivX 4/5, an implementation of MPEG-4 Part 2 Advanced Simple Profile. It was never a container. That mismatch shows up in the output.
| Question | Answer |
|---|---|
| Container written | AVI (RIFF), under a .divx filename |
| Video encoder used | libavcodec mpeg4 — MPEG-4 Part 2 ASP |
| Default audio | MP3 |
| Will it open by double-click? | Often not. Windows and macOS match players by extension, and .divx is not registered on a stock system |
| Fix for that | Rename the download to .avi. The bytes are already an AVI, so nothing is re-processed |
| Plays in VLC / MPV as-is? | Yes — those players sniff content rather than trusting the extension |
| Two-pass encoding | Not available. The native mpeg4 encoder aborts pass 2 when the requested bitrate turns out to be infeasible, so single-pass is used throughout |
The Quality Preset Trap on DivX
DivX has no CRF mode. When you leave File Compression on Quality Preset, the encoder cannot target a quality level, so the preset is converted into a multiple of the source file's own video bitrate, with a max rate 1.5x that target and a two-second buffer.
| Preset | Target bitrate | Effect on a 6 Mbps source |
|---|---|---|
| Highest | 150% of source | ~9 Mbps — file grows |
| Very High (default) | 132% of source | ~7.9 Mbps — file grows |
| High | 114% of source | ~6.8 Mbps — file grows |
| Medium | 90% of source | ~5.4 Mbps — modest shrink |
| Low | 72% of source | ~4.3 Mbps |
| Very Low | 54% of source | ~3.2 Mbps |
| Lowest | 30% of source | ~1.8 Mbps — visible artefacts |
So the default preset makes a same-format DivX job bigger while still costing you a generation of quality. If your goal is a smaller file, pick Medium or lower, or switch to Specific file size and name a megabyte budget. If shrinking is the only thing you want, Compress DivX is the better starting point — it opens on a "Target file size (%)" slider that this converter deliberately hides.
Frequently Asked Questions
Why would anyone convert DivX to DivX at all?
Because "same format" and "same settings" are different things. The common jobs are: re-encoding an AC3 or DTS soundtrack down to MP3 so a 2008 DVD player stops playing silence, cutting a 90-minute capture down to a two-minute Time Range, dropping a 720p rip to 480p for a device with a small screen, and putting a mixed folder of files onto one uniform bitrate and resolution.
Does converting DivX to DivX lose quality?
Yes, always. The file is decoded to raw frames and re-encoded from scratch — there is no passthrough or remux option anywhere in this pipeline. MPEG-4 ASP is a lossy codec, so you are stacking a second round of block-transform loss on top of the first. Keep the number of round trips to one, and do all your edits (trim, resize, audio swap) in that single pass rather than across several.
My DivX file won't open after downloading. What went wrong?
Almost certainly nothing went wrong with the conversion. The download is a valid AVI stream carrying MPEG-4 ASP video, but it is named .divx, and Windows Explorer, macOS Finder and most default video apps decide what to launch from the extension alone. Rename it to .avi and it opens. VLC, MPV and PotPlayer read the file header instead and play it either way.
Can I keep the AC3 or DTS surround track exactly as it is?
Not byte-for-byte — the audio is re-encoded along with the video. But you can keep it in the same codec: choose AC3 or DTS (DCA) from the Audio Codec list and the output carries a fresh AC3 or DTS track rather than being folded down to MP3. That preserves the channel layout, which is what matters for a receiver.
Why is my output larger than the file I uploaded?
Because Quality Preset on DivX is a bitrate multiplier and the default sits at 132% of the source. This surprises people constantly. Drop to Medium (90%), Low (72%) or Lowest (30%), or abandon the preset entirely and use Specific file size, which lets you type the megabyte figure you actually want.
Does Constant Quality work on this page, or is it decorative?
It works, but it is mislabelled. DivX is one of the qscale codecs, so the value you set is emitted as ffmpeg's -q:v on a 1-31 scale where lower is better — the opposite of the CRF scale the label implies. It opens at 5, which is a reasonable high-quality starting point. Values above roughly 12 get ugly fast.
What resolution should I pick if I want the file to play on an old DivX-certified DVD player?
Those players were certified against DivX Home Theater profile limits, typically 720x480 at 30 fps or 720x576 at 25 fps. Set Video resolution to Width x Height and type those numbers rather than relying on a preset, because the preset list is height-only — the width follows your source's aspect ratio and may land somewhere the player rejects.
Can I convert to a normal AVI instead and skip the renaming?
Yes, and it is usually the better answer if nothing in your workflow specifically demands the .divx name. DivX to AVI writes the same MPEG-4 ASP video into a file that every operating system already associates with a player. DivX to MP4 goes one step further and re-encodes to H.264, which is smaller at matched quality and plays in browsers, phones and smart TVs.
Is there a limit on how long or how large my DivX file can be?
Free uploads are limited to 400 MB per file (1 GB on Basic, 4 GB on Pro) and 5 jobs at a time. There is no watermark and no account requirement. Uploaded files and their outputs are deleted automatically after a few hours.