Thumbnail size calculator

Client

Plan CDN thumbnail variants.

Fit image into max box preserving aspect ratio.

About Thumbnail size calculator

Fit image into max box preserving aspect ratio. 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.

320 × 240 px thumbnail

Common use cases

  • Thumbnail 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?

Open the page directly—multi-field or file inputs are not URL-prefilled.

More tools

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