Letterbox size calculator

Client

Plan letterboxed video embed dimensions.

About Letterbox size calculator

Pillarbox/letterbox bars for fit-in-box. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • Video letterbox bars — Pillar/letterbox pixels for aspect fit. after you export or copy from the media workspace.
  • Aspect ratio calculator — Reduce width:height to smallest integers and preview scaled dimensions—local layout math. after you export or copy from the media workspace.
  • Image aspect fit — Scaled size when fitting into a max box. after you export or copy from the media workspace.
  • Video resolution scale — Scaled resolution preserving aspect ratio. after you export or copy from the media workspace.

Common use cases

  • Letterbox size calculator for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.