diff --git a/news/changelog-1.7.md b/news/changelog-1.7.md
index 4394506da36..7ae57de4d9a 100644
--- a/news/changelog-1.7.md
+++ b/news/changelog-1.7.md
@@ -68,3 +68,4 @@ All changes included in 1.7:
 - ([#11643](https://github.com/quarto-dev/quarto-cli/issues/11643)): Improve highlighting of nested code block inside markdown code block, i.e. using ` ```{{python}} ` or ` ```python ` inside ` ````markdown` fenced code block.
 - ([fb38eb5](https://github.com/quarto-dev/quarto-cli/commit/fb38eb56c11e09f44cef58fd3b697ff24bb5a3f3)) Use the `latest` parser for Acorn when analyzing JS code imported from OJS blocks.
 - ([#10532](https://github.com/quarto-dev/quarto-cli/issues/10532)): Quarto changed default of `--headless=old` to `--headless` as [Chrome 132 has removed old headless mode](https://developer.chrome.com/blog/removing-headless-old-from-chrome) and only support new mode. For using old mode, `QUARTO_CHROMIUM` could be set to a [new `chrome-headless-shell` binary](https://developer.chrome.com/blog/chrome-headless-shell) or too an older chrome version (between 128 and 132) and `QUARTO_CHROMIUM_HEADLESS_MODE` set to `old` for using old headless mode with that compatabitle version.
+- ([#10961](https://github.com/quarto-dev/quarto-cli/issues/10961)): Add more information on which Chrome Headless will be used in `quarto check install`. This is helpful to help debug mermaid issues.
diff --git a/src/command/check/check.ts b/src/command/check/check.ts
index be8419ab422..7d96933097c 100644
--- a/src/command/check/check.ts
+++ b/src/command/check/check.ts
@@ -48,6 +48,7 @@ import { typstBinaryPath } from "../../core/typst.ts";
 import { quartoCacheDir } from "../../core/appdirs.ts";
 import { isWindows } from "../../deno_ral/platform.ts";
 import { makeStringEnumTypeEnforcer } from "../../typing/dynamic.ts";
+import { findChrome } from "../../core/puppeteer.ts";
 
 export const kTargets = [
   "install",
@@ -212,11 +213,12 @@ async function checkInstall(services: RenderServices) {
   info("");
   const toolsMessage = "Checking tools....................";
   const toolsOutput: string[] = [];
+  let tools: Awaited<ReturnType<typeof allTools>>;
   await withSpinner({
     message: toolsMessage,
     doneMessage: toolsMessage + "OK",
   }, async () => {
-    const tools = await allTools();
+    tools = await allTools();
 
     for (const tool of tools.installed) {
       const version = await tool.installedVersion() || "(external install)";
@@ -260,6 +262,43 @@ async function checkInstall(services: RenderServices) {
   latexOutput.forEach((out) => info(out));
   info("");
 
+  const chromeHeadlessMessage = "Checking Chrome Headless....................";
+  const chromeHeadlessOutput: string[] = [];
+  await withSpinner({
+    message: chromeHeadlessMessage,
+    doneMessage: chromeHeadlessMessage + "OK",
+  }, async () => {
+    const chromeDetected = await findChrome();
+    const chromiumQuarto = tools.installed.find((tool) =>
+      tool.name === "chromium"
+    );
+    if (chromeDetected.path !== undefined) {
+      chromeHeadlessOutput.push(`${kIndent}Using: Chrome found on system`);
+      chromeHeadlessOutput.push(
+        `${kIndent}Path: ${chromeDetected.path}`,
+      );
+      if (chromeDetected.source) {
+        chromeHeadlessOutput.push(`${kIndent}Source: ${chromeDetected.source}`);
+      }
+    } else if (chromiumQuarto !== undefined) {
+      chromeHeadlessOutput.push(
+        `${kIndent}Using: Chromium installed by Quarto`,
+      );
+      if (chromiumQuarto?.binDir) {
+        chromeHeadlessOutput.push(
+          `${kIndent}Path: ${chromiumQuarto?.binDir}`,
+        );
+      }
+      chromeHeadlessOutput.push(
+        `${kIndent}Version: ${chromiumQuarto.installedVersion}`,
+      );
+    } else {
+      chromeHeadlessOutput.push(`${kIndent}Chrome:  (not detected)`);
+    }
+  });
+  chromeHeadlessOutput.forEach((out) => info(out));
+  info("");
+
   const kMessage = "Checking basic markdown render....";
   await withSpinner({
     message: kMessage,
diff --git a/src/core/puppeteer.ts b/src/core/puppeteer.ts
index 7e341852e21..891e6a968e9 100644
--- a/src/core/puppeteer.ts
+++ b/src/core/puppeteer.ts
@@ -200,15 +200,21 @@ export async function withHeadlessBrowser<T>(
   }
 }
 
-async function findChrome(): Promise<string | undefined> {
+interface ChromeInfo {
+  path: string | undefined;
+  source: string | undefined;
+}
+
+export async function findChrome(): Promise<ChromeInfo> {
   let path;
+  let source;
   // First check env var and use this path if specified
   const envPath = Deno.env.get("QUARTO_CHROMIUM");
   if (envPath) {
     debug("[CHROMIUM] Using path specified in QUARTO_CHROMIUM");
     if (safeExistsSync(envPath)) {
       debug(`[CHROMIUM] Found at ${envPath}, and will be used.`);
-      return envPath;
+      return { path: envPath, source: "QUARTO_CHROMIUM" };
     } else {
       debug(
         `[CHROMIUM] Not found at ${envPath}. Check your environment variable valye. Searching now for another binary.`,
@@ -222,6 +228,7 @@ async function findChrome(): Promise<string | undefined> {
       "/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge",
     ];
     path = programs.find(safeExistsSync);
+    source = "MacOS known location";
   } else if (isWindows) {
     // Try the HKLM key
     const programs = ["chrome.exe", "msedge.exe"];
@@ -231,7 +238,10 @@ async function findChrome(): Promise<string | undefined> {
           programs[i],
         "(Default)",
       );
-      if (path && safeExistsSync(path)) break;
+      if (path && safeExistsSync(path)) {
+        source = "Windows Registry";
+        break;
+      }
     }
 
     // Try the HKCR key
@@ -244,7 +254,10 @@ async function findChrome(): Promise<string | undefined> {
         );
         path = path?.match(/"(.*)"/);
         path = path ? path[1] : undefined;
-        if (path && existsSync(path)) break;
+        if (path && existsSync(path)) {
+          source = "Windows Registry";
+          break;
+        }
       }
     }
   } else {
@@ -254,6 +267,9 @@ async function findChrome(): Promise<string | undefined> {
     if (!path) {
       path = await which("chromium-browser");
     }
+    if (path && existsSync(path)) {
+      source = "PATH";
+    }
   }
   if (path) {
     debug("[CHROMIUM] Found Chromium on OS known location");
@@ -261,7 +277,7 @@ async function findChrome(): Promise<string | undefined> {
   } else {
     debug("[CHROMIUM] Chromium not found on OS known location");
   }
-  return path;
+  return { path: path, source: source };
 }
 
 export async function getBrowserExecutablePath() {
@@ -272,7 +288,7 @@ export async function getBrowserExecutablePath() {
   let executablePath: string | undefined = undefined;
 
   if (executablePath === undefined) {
-    executablePath = await findChrome();
+    executablePath = (await findChrome()).path;
   }
 
   if (executablePath === undefined && availableRevisions.length > 0) {