diff --git a/R/utils.R b/R/utils.R
index 0c13ae5..4f2c21f 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -46,3 +46,76 @@
   }
   pandoc_variable_arg(option, value)
 }
+
+# Resolve a logo image (yaml entries `partner_logo` / `funder_logo`) to a URL
+# usable inside CSS: http(s) and data URLs pass through unchanged, local
+# files are inlined as base64 data URIs. Inlining is required: CSS background
+# URLs would resolve relative to the theme stylesheet, and document-relative
+# files would be left behind when the rendered html is deployed elsewhere.
+logo_uri <- function(path) {
+  if (grepl("^(https?|data):", path)) {
+    return(path)
+  }
+  if (!file.exists(path)) {
+    stop("Logo file not found: ", path, call. = FALSE)
+  }
+  ext <- tolower(tools::file_ext(path))
+  mime <- switch(ext,
+    svg = "image/svg+xml", png = "image/png", jpg = , jpeg = "image/jpeg",
+    gif = "image/gif", webp = "image/webp",
+    stop("Unsupported logo format '", ext, "' (use svg, png, jpg, gif or webp)",
+      call. = FALSE
+    )
+  )
+  if (!requireNamespace("base64enc", quietly = TRUE)) {
+    stop("Package \"base64enc\" needed to embed local logo files. Please install it.",
+      call. = FALSE
+    )
+  }
+  sprintf("data:%s;base64,%s", mime, base64enc::base64encode(path))
+}
+
+#' HTML code for a linked QR code
+#'
+#' Generates a QR code (inline SVG) linking to the given URL and returns the
+#' corresponding HTML code, so a QR code can be placed anywhere in a
+#' presentation with inline R code.
+#'
+#' The `website` YAML entry of [revealjs_presentation()] uses this to
+#' place a linked QR code in the top left of the title slide.
+#'
+#' @param url Target URL for the QR code
+#' @param logo Optional path to a logo image to place in the center of the QR
+#'   code
+#' @param text Optional caption displayed below the QR code (alias:
+#'   `caption`)
+#' @param caption Alias for `text`
+#' @return Character string with HTML code for a linked QR code
+#' @export
+qrlink <- function(url, logo = NULL, text = NULL, caption = text) {
+  if (!requireNamespace("qrcode", quietly = TRUE)) {
+    stop("Package \"qrcode\" needed to generate QR codes. Please install it.",
+      call. = FALSE
+    )
+  }
+  tmp <- tempfile(fileext = ".svg")
+  qrcode <- qrcode::qr_code(url, ecl = if (is.null(logo)) "L" else "H")
+  if (!is.null(logo)) {
+    qrcode <- qrcode::add_logo(qrcode, logo, ecl = "L")
+  }
+  qrcode::generate_svg(qrcode, tmp, show = FALSE)
+
+  cap_html <- if (!is.null(caption) && nchar(trimws(caption)) > 0) {
+    sprintf('<span class="qrcode-caption">%s</span>', caption)
+  } else {
+    ""
+  }
+
+  svg <- gsub("\r?\n|\r", "", readChar(tmp, 1e7))
+  qr <- sprintf('<a class="qrcode" href="%s">%s</a>', url, svg)
+  if (nchar(cap_html) > 0) {
+    paste0('<div class="qrcode-container">', qr, cap_html, "</div>")
+  } else {
+    qr
+  }
+}