# Presentations

Source: https://visuelize.com/docs/decks
Updated: 2026-10-01

Decks are converted to flat per-slide JPEGs on upload. The display page never needs
      a PDF renderer, so a slide can never fail to paint in the middle of a meeting.
      Conversion runs one deck at a time.

      Slides render at 400 DPI (~5333 px wide for 16:9) at JPEG
      quality 92: native 4K with no upscaling, so text stays crisp on a projector.
      Higher fidelity means larger files (~4-8 MB per slide) and slower conversion; a
      big deck can take a while. Change an existing deck's resolution by re-uploading it
      (Replace file): slides are only rendered at upload time.

Accepted: .pdf .pptx .ppt .odp .pps .ppsx .key, and single images (.jpg .png .webp).

Upload limits. Every upload (decks, photos, music) is capped at 400 MB per file (60 files per request); the Caddy proxy allows a 500 MB body, so 400 MB is the effective ceiling. A 256 MB track uploads fine; it just takes time over the network.

      Send presenters to PDF. PPTX conversion is good, not perfect: font
      substitution is the usual culprit when a deck looks off. Carlito and Caladea are
      installed as metric-identical stand-ins for Calibri and Cambria, which covers most decks.

If a converted deck looks wrong, in order of effort:

- Replace file on the deck: upload the PDF version. Same deck, so screen assignments and agenda links stay pointed at it.

- Edit slides in the deck's menu, then Replace slide: upload a PNG of just that slide.

- Upload slide images directly as their own deck.