CONVERT MP4 → AVI (MP4 to AVI)
Convert MP4 to AVI for legacy media player compatibility.
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HOW TO CONVERT MP4 → AVI
Provide the MP4 clip
Upload through the browser; transfers are encrypted end-to-end and files are quarantined per session.
Convert to AVI
The conversion keeps resolution, frame rate and bit depth identical to the source unless you explicitly override them.
Save to your device
Click download to pull the AVI to local storage; share the short-lived URL with collaborators if needed.
MP4 is a container that stores video almost exclusively as H.264 or H.265 with temporal compression: frames are encoded as keyframes and delta frames that reference each other across time. AVI, developed by Microsoft in 1992 under the RIFF specification, is a simpler interleaved container that most editing and legacy capture software treats as a direct frame store. The real reason to convert MP4 to AVI today is not quality — it is software compatibility. Windows Movie Maker, certain industrial video-analysis tools, older Pinnacle and Vegas timelines, and a range of embedded-system playback hardware that predates the ISO 14496-12 base-media file format simply do not parse MP4 atoms correctly. They do parse AVI RIFF chunks without issue. A secondary reason is round-tripping through software that writes AVI natively: when your capture card or VHS digitizer outputs AVI and your downstream tool must receive and return the same container for batch-processing scripts to work, MP4 is the odd one out.
Why convert MP4 to AVI
The dominant use case is legacy-software ingestion. Devices running Windows XP or early Windows 7 environments, certain CNC machine HMI panels that play safety-instruction videos, and older DVD-authoring pipelines such as DVD Architect 5 all expect AVI with DivX, Xvid, or raw YUV inside. A second real-world driver is frame-accurate editing in software that handles AVI I-frame-only codecs better than H.264 GOP structures: scrubbing a long-GOP H.264 MP4 causes seek latency because the decoder must reconstruct a frame from its reference chain, whereas an AVI wrapped around MJPEG or an Xvid stream with frequent keyframes seeks almost instantly on older hardware.
MP4 vs AVI — Technical specifications
Side-by-side comparison of the technical details.
MP4
- MIME type
- video/mp4
- Container
- ISO Base Media File Format (ISO/IEC 14496-12)
- Common video codecs
- H.264 (AVC), H.265 (HEVC), AV1, VP9
- Common audio codecs
- AAC, MP3, FLAC, Opus
- Max file size
- Practically ~16 TB; 2^63 bytes theoretical
- Streaming
- Supported with faststart (moov atom at front)
- MIME Type
- video/mp4
- Extension
- .mp4
- Category
- Video Files
- Full Name
- MP4 Video
- Conversion Engine
- FFMPEG
AVI
- MIME type
- video/x-msvideo
- Container
- RIFF
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- MIME Type
- video/x-msvideo
- Extension
- .avi
- Category
- Video Files
- Full Name
- AVI Video
- Conversion Engine
- FFMPEG
- Codec support
- Any codec via FourCC identifiers
| Specification | MP4 | AVI |
|---|---|---|
| MIME type | video/mp4 | video/x-msvideo |
| Container | ISO Base Media File Format (ISO/IEC 14496-12) | RIFF |
| Common video codecs | H.264 (AVC), H.265 (HEVC), AV1, VP9 | — |
| Common audio codecs | AAC, MP3, FLAC, Opus | — |
| Max file size | Practically ~16 TB; 2^63 bytes theoretical | 2 GB (original); 4 GB (OpenDML extension) |
| Streaming | Supported with faststart (moov atom at front) | — |
| MIME Type | video/mp4 | video/x-msvideo |
| Extension | .mp4 | .avi |
| Category | Video Files | Video Files |
| Full Name | MP4 Video | AVI Video |
| Conversion Engine | FFMPEG | FFMPEG |
| Codec support | — | Any codec via FourCC identifiers |
MP4 vs AVI — Strengths and limitations
What each format does best, and where it falls short.
MP4 Strengths
- Universal playback — every browser, phone, TV, game console, and editing suite reads MP4.
- Supports modern codecs (H.264, H.265, AV1) with no container changes.
- Progressive streaming works with the "moov atom" at the start of the file.
- Carries subtitles, chapters, multiple audio tracks, and embedded metadata.
- ISO-standardized (ISO/IEC 14496-14) and patent-licensable via MPEG LA.
Limitations
- Codec licensing (H.264, H.265) carries royalty costs for commercial use.
- Streaming requires the moov atom at the start — a misplaced atom breaks web playback.
- Not ideal for lossless or professional editing workflows (use ProRes or DNxHD instead).
AVI Strengths
- Simple, well-documented format — trivial for any video library to parse.
- Universal Windows playback since Video for Windows in 1992.
- Low encoding overhead — interleaved structure is fast to write.
- Works with any codec technically, including modern ones.
Limitations
- Aging container — no native support for chapters, subtitles, or multi-audio selection.
- File-size limits (2 GB original, 4 GB with OpenDML) break for HD content.
- Variable-framerate video causes sync drift.
Quality & Compatibility
The conversion involves transcoding, not remuxing. MP4 typically carries H.264 in YCbCr 4:2:0 at 8-bit depth; AVI most commonly receives Xvid or DivX MPEG-4 Part 2, also lossy. Two lossy generations accumulate compression artifacts, particularly in fine textures and high-motion edges. Alpha channel transparency is not preserved: AVI does not have a standardized track for per-pixel alpha the way MOV does with the Animation codec, so any alpha channel in the source is composited against black or dropped. Color space remains YCbCr 4:2:0 in typical output. HDR metadata (HDR10 or Dolby Vision side-data stored in MP4 SEI NAL units) is stripped because AVI has no equivalent metadata container. Audio passes as MP3 or PCM inside AVI; AAC, which is the default MP4 audio codec, is re-encoded to MP3, introducing a second lossy generation on the audio track as well.
Tips for Best Results
- If your target software supports it, request an Xvid-encoded AVI with a keyframe interval of 1 (every frame is a keyframe): this eliminates GOP seek latency entirely at the cost of a larger file, and is worth it for frame-accurate editorial work.
- For audio fidelity, choose PCM 16-bit output inside AVI rather than MP3 re-encoding: PCM is lossless at the container level, adds no second-generation codec degradation, and AVI handles uncompressed audio tracks natively through its WAVE chunk.
- If your target is a specific older Windows application, check whether it requires VfW (Video for Windows) codec compatibility rather than DirectShow: VfW-only hosts cannot decode H.264 inside AVI, so the codec choice inside the AVI container matters as much as the container itself.
Frequently Asked Questions
Only when it has to. If the codecs inside MP4 (usually H.264 or H.265 for video, AAC for audio) are accepted by AVI, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
MP4 Video
Source formatMP4 is the most universally supported video container format. It typically uses H.264 or H.265 video codecs with AAC audio, providing an excellent balance of quality and file size across all devices and platforms.
AVI Video
Target formatAVI is a legacy Microsoft multimedia container that stores audio and video data. While largely superseded by modern formats, it remains widely recognized and is produced by many older devices and screen recorders.
Going the other way? Convert AVI back to MP4 with the same engine.
Common Use Cases
Share across platforms
Send AVI files to anyone without worrying about whether they have the right software for MP4.
Embed in documents
Drop AVI output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AVI often produces smaller files than MP4 for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
MP4 vs AVI — Typical file sizes
Approximate file sizes for common scenarios.
- Smartphone video (1080p, 1 min) 60–120 MB
- 4K video (1 min, H.265) 200–400 MB
- Streamed movie (90 min, H.264) 1–4 GB
- 10-min video (XviD / MP3) 100-200 MB
- 45-min TV episode (DivX) 350-700 MB
- 2-hour movie (DVD rip) 700 MB - 1.4 GB
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10-bit color grading workflows, Apple ProRes mastering, and automated watch-folder queues.
Related comparisons
See these formats side by side to understand which fits your use case best.
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