Presio

Presio

Present PDFs from your browser: a no-install alternative to Pympress. Try it at presio.ch or presio.xyz (use presio.ch if your institution blocks .xyz).

Plugins

Open a PDF, drive the slides from one browser window and show them in another. This repository is the source of the hosted service.

[Demo]

[How it works]

Features

• Local by default: your PDF stays in the browser and works offline. Local presentations are kept for 7 days.
• Controller + viewer: the viewer window mirrors the controller, in sync.
• Present across devices: log in and sync to get a 6-character code. Viewers enter it on the home page and follow along live.
• Shared control: give someone a passphrase to drive.
• Speaker notes: shown next to the current and next slide, rendered as markdown.
• Embedded media: videos, GIFs and YouTube/Vimeo, with playback synced to viewers.
• Timer, a customizable layout and remappable shortcuts.
• Plugins: add features such as polls or captions; see Plugins.
• Agent APIs: an MCP server and a REST API; see Use it from an AI agent.

Adding videos and speaker notes

Any PDF works. For notes and media, use the official packages, or embed them by hand (see Embedding notes by hand):

• Typst — presio-typst-package
• LaTeX — presio-latex-package

Typst

#import "@preview/presio:0.2.3": media, speaker-notes
= Introduction
Hello world.
#speaker-notes[  Remember to mention the demo before moving on.]
#media("https://www.youtube.com/watch?v=dQw4w9WgXcQ", width: 60%, aspect-ratio: 16/9)

LaTeX

[Open in Overleaf]

\documentclass{beamer}\usepackage{presio}
\begin{document}
\begin{frame}{Introduction}  Hello world.  \presionote{Remember to mention the demo before moving on.}\end{frame}
\begin{frame}{The demo}  \presiomedia[width=0.7\linewidth]{https://www.youtube.com/watch?v=dQw4w9WgXcQ}\end{frame}
\end{document}

To install, copy presio.sty from the package repository next to your .tex file.

Embedding notes by hand

Presio reads speaker notes from JSON files attached to the PDF (Typst) or from note: link annotations (LaTeX).

Typst: define a helper and call it on each slide:

#let speaker-notes(notes) = context {  // Page number keeps the attachment filename unique per slide  let page-num = counter(page).display()  let filename = "notes-slide-" + page-num + ".json"
  let json-string = json.encode((slide: page-num, notes: notes))
  pdf.attach(    filename,    bytes(json-string),    description: "Speaker notes for slide " + page-num,    mime-type: "application/json",  )}
#speaker-notes("Remember to mention the demo.")

LaTeX: use hyperref to create an invisible note: link:

\usepackage{hyperref}
\newcommand{\speakernote}[1]{%  \href{note:#1}{\phantom{n}}%}
% Usage on a slide:\speakernote{Remember to mention the demo.}

Check the result at presio.ch/check, which reports whether the notes and media on each page are valid.

Plugins

Plugins add features such as live polls or closed captions. Browse them under the presio-plugin topic on GitHub and add one from Settings → Discover plugins.

To build your own, paste this prompt into Claude Code, Codex or Cursor:

Read https://presio.ch/plugins.md and build me a Presio plugin. Ask me what it should do first.

Use it from an AI agent

Agents can present and check PDFs over MCP or REST. Start at presio.ch/llms.txt. To add the MCP server to Claude Code:

claude mcp add --transport http presio https://presio.ch/mcp

Self-hosting

For a full deployment (accounts, cross-device sync, your own domain) see deploy/README.md.

For a single offline container with no accounts or Supabase:

docker run -d -p 3001:3001 -e PRESIO_MODE=local -e LOCAL_DATA_DIR=/data \  -e TRUST_PROXY=false -v presio-data:/data \  ghcr.io/potentialhedge/presio-local:1

:1 tracks the current major version, so it gets no breaking changes (see Versions and upgrading). See Running fully local / offline for what this mode includes.