diff --git a/api/formapi.js b/api/formapi.js
index 89c385a..70d1b28 100644
--- a/api/formapi.js
+++ b/api/formapi.js
@@ -32,23 +32,19 @@ module.exports = [
 					if (params.has("referrer")) {
 						return {
 							statusCode: 303,
-							contentType: "application/json",
+							contentType: "text/plain",
 							headers: Object.assign(responseHeaders, {
 								Location: params.get("referrer")
 							}),
-							content: {
-								status: "ok"
-							}
+							content: "Success, redirecting..."
 						}
 						return redirect(params.get("referrer"), 303)
 					} else {
 						return {
 							statusCode: 200,
-							contentType: "application/json",
+							contentType: "text/plain",
 							headers: responseHeaders,
-							content: {
-								status: "ok"
-							}
+							content: "Success."
 						}
 					}
 				})
@@ -56,7 +52,27 @@ module.exports = [
 		}
 	},
 	{
-		route: `/formapi/erase`, methods: ["POST"], upload: true, code: async ({req, fill, body}) => {
+		route: `/formapi/markwatched/(${constants.regex.video_id})`, methods: ["POST"], code: async ({req, fill}) => {
+			const videoID = fill[0]
+			const user = getUser(req)
+			const token = user.token
+			if (token) {
+				db.prepare("INSERT OR IGNORE INTO WatchedVideos (token, videoID) VALUES (?, ?)").run(token, videoID)
+			}
+			return {
+				statusCode: 303,
+				contentType: "text/plain",
+				headers: {
+					Location: "/subscriptions"
+				},
+				content: {
+					status: "Success, redirecting..."
+				}
+			}
+		}
+	},
+	{
+		route: "/formapi/erase", methods: ["POST"], upload: true, code: async ({req, fill, body}) => {
 			return new V()
 				.with(validate.presetLoad({body}))
 				.with(validate.presetURLParamsBody())
@@ -69,13 +85,12 @@ module.exports = [
 					})
 					return {
 						statusCode: 303,
+						contentType: "text/plain",
 						headers: {
 							location: "/",
 							"set-cookie": `token=; Path=/; Max-Age=0; HttpOnly; SameSite=Lax`
 						},
-						content: {
-							status: "ok"
-						}
+						content: "Success, redirecting..."
 					}
 				})
 				.go()
@@ -88,10 +103,8 @@ module.exports = [
 				headers: setToken({
 					location: "/subscriptions"
 				}, fill[0]).responseHeaders,
-				contentType: "application/json",
-				content: {
-					status: "ok"
-				}
+				contentType: "text/plain",
+				content: "Success, redirecting..."
 			}
 		}
 	}
diff --git a/html/static/js/mark-watched.js b/html/static/js/mark-watched.js
new file mode 100644
index 0000000..0f0f9a9
--- /dev/null
+++ b/html/static/js/mark-watched.js
@@ -0,0 +1,24 @@
+import {ElemJS} from "/static/js/elemjs/elemjs.js"
+
+class MarkWatchedButton extends ElemJS {
+	constructor(element) {
+		super(element)
+		this.on("click", this.onClick.bind(this))
+	}
+
+	onClick(event) {
+		event.preventDefault()
+		let video = this.element
+		while (!video.classList.contains("subscriptions-video")) {
+			video = video.parentElement
+		}
+		video.classList.add("video-list-item--watched")
+		const form = this.element.parentElement
+		fetch(form.getAttribute("action"), {method: "POST"})
+		form.remove()
+	}
+}
+
+export {
+	MarkWatchedButton
+}
diff --git a/html/static/js/subscriptions.js b/html/static/js/subscriptions.js
new file mode 100644
index 0000000..f10fdb1
--- /dev/null
+++ b/html/static/js/subscriptions.js
@@ -0,0 +1,6 @@
+import {qa} from "/static/js/elemjs/elemjs.js"
+import {MarkWatchedButton} from "/static/js/mark-watched.js"
+
+for (const button of qa(".mark-watched__button")) {
+	new MarkWatchedButton(button)
+}
diff --git a/pug/includes/video-list-item.pug b/pug/includes/video-list-item.pug
index 2d1343a..4cd4b86 100644
--- a/pug/includes/video-list-item.pug
+++ b/pug/includes/video-list-item.pug
@@ -1,4 +1,4 @@
-mixin video_list_item(className, video, instanceOrigin)
+mixin video_list_item(className, video, instanceOrigin, options = {})
   div(class={[className]: true, "video-list-item--watched": video.watched})
     - let link = `/watch?v=${video.videoId}`
     a(href=link tabindex="-1").thumbnail
@@ -16,5 +16,9 @@ mixin video_list_item(className, video, instanceOrigin)
         if video.publishedText
           = ` • `
           span.published= video.publishedText
+        if options.showMarkWatched
+          form(method="post" action=`/formapi/markwatched/${video.videoId}`).mark-watched
+            = ` • `
+            button.mark-watched__button Mark watched
       if video.descriptionHtml
         div.description!= video.descriptionHtml
diff --git a/pug/subscriptions.pug b/pug/subscriptions.pug
index c497951..6cecdde 100644
--- a/pug/subscriptions.pug
+++ b/pug/subscriptions.pug
@@ -4,6 +4,7 @@ include includes/video-list-item.pug
 
 block head
   title Subscriptions - CloudTube
+  script(type="module" src=getStaticURL("html", "/static/js/subscriptions.js"))
 
 block content
   main.subscriptions-page
@@ -34,7 +35,7 @@ block content
           label(for="watched-videos-display").watched-videos-display-label Hide watched videos
 
       each video in videos
-        +video_list_item("subscriptions-video", video, instanceOrigin)
+        +video_list_item("subscriptions-video", video, instanceOrigin, {showMarkWatched: settings.save_history && !video.watched})
     else
       .no-subscriptions
         h2 You have no subscriptions.
diff --git a/sass/includes/forms.sass b/sass/includes/forms.sass
index 9426dd5..5f48a5f 100644
--- a/sass/includes/forms.sass
+++ b/sass/includes/forms.sass
@@ -101,3 +101,17 @@ fieldset
     .#{$base}-label
       padding: 12px 0px 12px 32px
       cursor: pointer
+
+@mixin single-button-form
+  display: inline-block
+  white-space: pre-wrap // preserve whitespace inside the form at the edge
+
+  > button
+    background: none
+    padding: 0
+    margin: 0
+    border: none
+    color: inherit
+    font-family: inherit
+    font-size: inherit
+    text-decoration: underline
diff --git a/sass/includes/subscriptions-page.sass b/sass/includes/subscriptions-page.sass
index e10489d..46f4050 100644
--- a/sass/includes/subscriptions-page.sass
+++ b/sass/includes/subscriptions-page.sass
@@ -39,3 +39,6 @@
 
 #watched-videos-display:checked ~ .video-list-item--watched
   display: none
+
+.mark-watched
+  @include forms.single-button-form