massfileconverter

Convert WebM to MP4for Instagram

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

Convert to
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 Instagram. Change it if you need to.

  3. 3

    Download

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

What Instagram accepts

Max file size
650 MB
Best resolution
1080 × 1920 (9:16 Vertical)
Video codec
H.264 High Profile
Audio codec
AAC 128 kbps
Max length
90 seconds

Made for Reels and Stories. Keep it at 30 fps so Instagram does not squash the quality when it re-processes your video.

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 Instagram?

Instagram plays H.264 High Profile video best. Keep files under 650 MB and use 1080 × 1920 (9:16 Vertical).

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