Video to Android MP4 Converter โ€“ H.264/AAC

Re-encode MOV, MKV, WebM and other videos to H.264/AAC MP4 for Android testing. Playback still depends on the phone, OS and video settings.

Click for theater mode

Drop video files here

Add a supported video. Conversion uses browser CPU and RAM; large files may fail on limited devices.

Conversion Mode

Add videos to convert to MP4.

Selected videos are processed in your browser and are not uploaded by the converter.

Conversion Queue

0 videos total

Your videos will appear here.

How to Use

  1. Drag and drop the video that won't play properly on your Android device into the conversion area above.
  2. Keep Re-encode selected to create H.264/AAC. Use stream copy only if the existing codecs are already supported by the target device.
  3. Click "Convert to MP4". FFmpeg loads on first use and processes the video in the browser.
  4. Download and test the result on the target Android device. If playback still fails, inspect the device's resolution and codec-profile limits.

Core Features

H.264/AAC MP4 for Android Testing

Re-encode common MOV, MKV, WebM, AVI, and other recognized inputs to H.264 video at CRF 23 with AAC audio at 128 kbps, then test the output on the target phone or tablet.

Compatibility Is Device-Specific

H.264/AAC in MP4 is broadly supported, but this page does not guarantee playback on every Android device. Compatibility can change with the device, OS version, resolution, and H.264 profile.

Re-encode or Stream Copy

Use Re-encode to replace source codecs with H.264/AAC. Stream copy only repackages existing streams and cannot correct an Android codec incompatibility.

Browser CPU and RAM Boundary

The selected video is processed in browser FFmpeg and is not uploaded by the converter. The engine loads on first use; large or high-resolution files can require substantial CPU and RAM.

For general-purpose output without an Android testing goal, use the MP4 converter.

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Calculation Logic

The shared converter runs FFmpeg WebAssembly. Re-encode mode creates H.264 with the ultrafast preset at CRF 23 and AAC at 128 kbps. It does not set an Android-specific H.264 profile, level, frame size, or device preset, and re-encoding is lossy.

Stream copy retains the source codecs and adds no new encoding loss. It is useful only when those streams already work in MP4 and on the target Android device. Both modes use device CPU and RAM.

FAQ

Why do videos sent from my friend's iPhone fail to play on my Android?

Some iPhones record HEVC video in a MOV container, and the receiving Android device may not support that codec or profile. Re-encode mode creates an H.264/AAC MP4 for testing, but device limits still apply.

Does this MP4 work on every Android phone?

No. Android devices differ in supported H.264 profiles, levels, resolutions, frame rates, and OS decoders. Test the output on the actual device.

Does re-encoding reduce quality?

Yes. H.264 at CRF 23 is a lossy encode. The visible difference depends on the source, but the process cannot be described as lossless.

Why can a large video fail?

The browser keeps the input, engine, and output in memory. Long or high-resolution videos can exceed available RAM or take substantial CPU time.

Can stream copy fix missing video or audio?

Not when the device rejects the existing codec. Stream copy retains the codec; use re-encode to create H.264/AAC, then test again.