massfileconverter

Shrink MP4for X (Twitter)

Free. No sign-up. Your files never leave this device.

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Size
Drag videos here

Up to 2 GB each. MP4, MOV, WebM, MKV, AVI.

How it works

  1. 1

    Drop your videos

    Add as many as you like. They stay on your device.

  2. 2

    Check the settings

    We've already picked the right format for X (Twitter). Change it if you need to.

  3. 3

    Download

    Grab each file, or all of them in one zip.

What X (Twitter) accepts

Max file size
512 MB
Best resolution
1920 × 1080 or 1080 × 1080
Video codec
H.264 High Profile 4.2
Audio codec
AAC High Quality
Max length
2 min 20 sec

Plays smoothly in the feed without stopping to buffer.

Questions

Are my files uploaded anywhere?

No. Conversion runs inside your browser, so your videos never leave your device. That's also why there's no file size paywall.

Is it really free?

Yes. No sign-up, no watermark, no limit on how many files you convert.

How big can my files be?

Up to about 2 GB each. Very large files depend on how much memory your device has.

Why is it slower on my phone?

Your device does the work, so a laptop will usually be quicker than a phone. Keep the tab open until it finishes.

What's the best format for X (Twitter)?

X (Twitter) plays H.264 High Profile 4.2 video best. Keep files under 512 MB and use 1920 × 1080 or 1080 × 1080.

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