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POLARIS OFFICE TOOLS+
video_file

YouTube Shorts Converter

Trim a video, frame it in vertical 9:16, and download an MP4. Process locally in your browser.

Turn your video into a vertical Short

MP4 · MOV · WebM / Up to 200MB · No server uploads

Choose a video saved on your device, rather than a YouTube link.

01 · Trim & frame

Start · end

Select up to 180 seconds

Framing · background

Choose a color, blurred video or image to keep the entire video and fill the surrounding space. The background appears in both the preview and exported MP4.

Title · caption · output

Title & caption

Shown throughout the selected segment. Long text wraps and shrinks to fit.

Video, background and text fade from or to black. Each fade is automatically limited to half the segment length.

Music · audio

Background music

MP3 · WAV · M4A · AAC · OGG / Up to 20MB

Music starts at the beginning of each selection and loops if shorter. Muting original audio does not mute music. Music and volumes are saved per segment.

Selection · — · 9:16

The first conversion loads a ~31MB engine. Longer clips can take time.

02 · Vertical preview

Choose a video to preview it here.

Your Short starts here

Batch segments

Create multiple Shorts

Add a segment to save its title, background and resolution too. Convert up to 10 segments into separate MP4 files.

No saved segments yet.

Result

Complete your work in Edit to see the result here.

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How to use · Security · Features

How to use

  • 1. Check the size and formats shown in the uploader, then choose or drag in your file
  • 2. Pixel limits: AI Upscale (2048×2048), AI Colorize (2048×2048), others (no limit)
  • 3. Run the tool you need and download the result
  • 4. Files are saved safely on your device

Security

  • • Each tool clearly identifies whether it uses browser or API processing
  • • Browser-processing tools do not upload files to a server
  • • Optional or required API tools may send the file only to complete that task
  • • Image file contents are not sent to analytics or advertising systems

Features

  • • All image tools in one place
  • • Background removal, resize, compress, format conversion, and more
  • • Download button activates when processing completes
  • • Fast and intuitive user interface
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