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Convert video for X (Twitter)

Make an MP4 that X accepts without an error: H.264, AAC, up to 1920 × 1200, and 60 fps at most. Processing stays on your device.

Files stay on your device

Without Premium, X takes videos up to 2 minutes 20 seconds and 512 MB. Trim a longer video first.

Drop a file to convert

See its format, then choose an output.

Any media file this browser’s engine can read.

How to convert a video for Twitter

X shows an error for videos it can’t process, such as HEVC from an iPhone, 4K, or more than 60 frames per second. Open the video here and export an MP4 with H.264 video and AAC sound, scaled to fit 1920 × 1200 when it’s larger. Nothing is uploaded until you post it to X yourself.

  1. Step 1

    Choose a video
    Pick the video X won’t take.

  2. Step 2

    Check the length
    Trim it first if it runs past 2:20.

  3. Step 3

    Download the MP4
    Save it, then post it to X.

What to expect

Supported inputs
Any media file this browser’s engine can read.
What happens
H.264 video that already fits is copied. Other video is re-encoded to H.264, scaled down to fit 1920 × 1200 or 1200 × 1920 and to 60 fps when it’s more. Sound that isn’t AAC is re-encoded to AAC, or to MP3 in Firefox, which can’t encode AAC.
Limits
X allows 2 minutes 20 seconds and 512 MB without Premium. Its accepted shapes run from 1:2.39 to 2.39:1, so a very wide or tall video may still need a crop.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

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