diff --git a/bun.lock b/bun.lock
index 0a5a1ad..26a943b 100644
--- a/bun.lock
+++ b/bun.lock
@@ -30,6 +30,7 @@
         "markdown-it": "^14.1.1",
         "markdown-it-footnote": "^4.0.0",
         "markdown-it-mark": "^4.0.0",
+        "markdown-it-task-lists": "^2.1.1",
         "sanitize-html": "^2.17.4",
         "sharp": "^0.34.5",
       },
@@ -592,6 +593,8 @@
 
     "markdown-it-mark": ["markdown-it-mark@4.0.0", "", {}, "sha512-YLhzaOsU9THO/cal0lUjfMjrqSMPjjyjChYM7oyj4DnyaXEzA8gnW6cVJeyCrCVeyesrY2PlEdUYJSPFYL4Nkg=="],
 
+    "markdown-it-task-lists": ["markdown-it-task-lists@2.1.1", "", {}, "sha512-TxFAc76Jnhb2OUu+n3yz9RMu4CwGfaT788br6HhEDlvWfdeJcLUsxk1Hgw2yJio0OXsxv7pyIPmvECY7bMbluA=="],
+
     "mdurl": ["mdurl@2.0.0", "", {}, "sha512-Lf+9+2r+Tdp5wXDXC4PcIBjTDtq4UKjCPMQhKIuzpJNW0b96kVqSwW0bT7FhRSfmAiFYgP+SCRvdrDozfh0U5w=="],
 
     "memoirist": ["memoirist@0.4.0", "", {}, "sha512-zxTgA0mSYELa66DimuNQDvyLq36AwDlTuVRbnQtB+VuTcKWm5Qc4z3WkSpgsFWHNhexqkIooqpv4hdcqrX5Nmg=="],
diff --git a/package.json b/package.json
index 9a296e0..dd8c31c 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,7 @@
 		"markdown-it": "^14.1.1",
 		"markdown-it-footnote": "^4.0.0",
 		"markdown-it-mark": "^4.0.0",
+		"markdown-it-task-lists": "^2.1.1",
 		"sanitize-html": "^2.17.4",
 		"sharp": "^0.34.5"
 	},
diff --git a/public/editor/preview.ts b/public/editor/preview.ts
index d9ccbe4..d3dd543 100644
--- a/public/editor/preview.ts
+++ b/public/editor/preview.ts
@@ -2,6 +2,7 @@ import DOMPurify from "dompurify";
 import MarkdownIt from "markdown-it";
 import footnotePlugin from "markdown-it-footnote";
 import markPlugin from "markdown-it-mark";
+import taskListPlugin from "markdown-it-task-lists";
 import { commentPlugin } from "../../src/lib/markdown/comment-plugin.ts";
 import { katexPlugin } from "../../src/lib/markdown/katex-plugin.ts";
 import { wikilinkPlugin } from "../../src/lib/markdown/wikilink-plugin.ts";
@@ -11,6 +12,7 @@ md.use(commentPlugin);
 md.use(wikilinkPlugin);
 md.use(footnotePlugin);
 md.use(markPlugin);
+md.use(taskListPlugin, { enabled: false, label: true });
 md.use(katexPlugin, { throwOnError: false });
 
 // Matches the server-side allowlist closely. The preview is for the author's
diff --git a/public/style.css b/public/style.css
index 3cde34a..fe74ab7 100644
--- a/public/style.css
+++ b/public/style.css
@@ -29,6 +29,17 @@
 	margin-left: 0.25rem;
 }
 
+/* Task lists */
+.task-list-item {
+	list-style-type: none;
+	margin-left: -1.5em;
+}
+
+.task-list-item input[type="checkbox"] {
+	margin-right: 0.5em;
+	vertical-align: middle;
+}
+
 /* ==highlight== markup */
 mark {
 	background-color: var(--accent-soft);
diff --git a/src/lib/markdown.ts b/src/lib/markdown.ts
index 5520e23..60e6e20 100644
--- a/src/lib/markdown.ts
+++ b/src/lib/markdown.ts
@@ -1,6 +1,7 @@
 import MarkdownIt from "markdown-it";
 import footnotePlugin from "markdown-it-footnote";
 import markPlugin from "markdown-it-mark";
+import taskListPlugin from "markdown-it-task-lists";
 import { commentPlugin } from "./markdown/comment-plugin.ts";
 import { headingAnchorPlugin } from "./markdown/heading-anchor-plugin.ts";
 import { type KatexPluginEnv, katexPlugin } from "./markdown/katex-plugin.ts";
@@ -65,6 +66,7 @@ md.use(wikilinkPlugin);
 md.use(headingAnchorPlugin);
 md.use(footnotePlugin);
 md.use(markPlugin);
+md.use(taskListPlugin, { enabled: false, label: true });
 md.use(vizPlugin);
 md.use(katexPlugin, { throwOnError: false });
 md.use(youtubePlugin);
diff --git a/src/lib/markdown/sanitize.ts b/src/lib/markdown/sanitize.ts
index bbc0ded..c607100 100644
--- a/src/lib/markdown/sanitize.ts
+++ b/src/lib/markdown/sanitize.ts
@@ -52,6 +52,8 @@ const SANITIZE_OPTIONS: sanitizeHtml.IOptions = {
 		"div",
 		"span",
 		"section",
+		"label",
+		"input",
 		"iframe",
 		// katex emits these for math rendering
 		"math",
@@ -95,6 +97,7 @@ const SANITIZE_OPTIONS: sanitizeHtml.IOptions = {
 			"class",
 			"frameborder",
 		],
+		input: ["type", "checked", "disabled"],
 		"*": ["id", "class", "style", "data-viz-type", "data-viz", "aria-hidden"],
 		th: ["scope", "colspan", "rowspan", "align"],
 		td: ["colspan", "rowspan", "align"],
diff --git a/src/types.d.ts b/src/types.d.ts
index 4420e8c..3520bbd 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -11,3 +11,14 @@ declare module "markdown-it-footnote" {
 	const plugin: MarkdownIt.PluginSimple;
 	export default plugin;
 }
+
+declare module "markdown-it-task-lists" {
+	import type MarkdownIt from "markdown-it";
+
+	const plugin: MarkdownIt.PluginWithOptions<{
+		enabled?: boolean;
+		label?: boolean;
+		labelAfter?: boolean;
+	}>;
+	export default plugin;
+}
diff --git a/tests/lib/markdown.test.ts b/tests/lib/markdown.test.ts
index 5e77e40..f4d9a26 100644
--- a/tests/lib/markdown.test.ts
+++ b/tests/lib/markdown.test.ts
@@ -227,6 +227,32 @@ describe("highlights", () => {
 	});
 });
 
+describe("task lists", () => {
+	test("renders unchecked task", () => {
+		const { html } = renderMarkdown("- [ ] Todo item");
+		expect(html).toContain('type="checkbox"');
+		expect(html).not.toContain("checked");
+	});
+
+	test("renders checked task", () => {
+		const { html } = renderMarkdown("- [x] Done item");
+		expect(html).toContain('type="checkbox"');
+		expect(html).toContain("checked");
+	});
+
+	test("checkboxes are disabled (read-only)", () => {
+		const { html } = renderMarkdown("- [x] Item");
+		expect(html).toContain("disabled");
+	});
+
+	test("mixes regular list items and tasks", () => {
+		const src = "- Regular item\n- [ ] Task item\n- Another regular";
+		const { html } = renderMarkdown(src);
+		expect(html).toContain('type="checkbox"');
+		expect(html).toContain("Regular item");
+	});
+});
+
 describe("footnotes", () => {
 	test("renders reference + definition", () => {
 		const { html } = renderMarkdown("Sentence.[^1]\n\n[^1]: Note text.");