diff --git a/src/components/SplitTimeline.vue b/src/components/SplitTimeline.vue
index dc31e5d5..093e1418 100644
--- a/src/components/SplitTimeline.vue
+++ b/src/components/SplitTimeline.vue
@@ -1,8 +1,18 @@
 <template>
   <div class="container">
-    <div class="primary">
+    <div class="primary" ref="primary">
       <component :is="primary" />
     </div>
+
+    <div
+      class="separator"
+      ref="separator"
+      @pointerdown="sepDown"
+      @touchmove.passive="sepTouchMove"
+      @touchend.passive="pointerUp"
+      @touchcancel.passive="pointerUp"
+    ></div>
+
     <div class="timeline">
       <Timeline />
     </div>
@@ -13,6 +23,7 @@
 import { defineComponent } from "vue";
 import Timeline from "./Timeline.vue";
 const MapSplitMatter = () => import("./top-matter/MapSplitMatter.vue");
+import { emit } from "@nextcloud/event-bus";
 
 export default defineComponent({
   name: "SplitTimeline",
@@ -21,6 +32,11 @@ export default defineComponent({
     Timeline,
   },
 
+  data: () => ({
+    pointerDown: false,
+    primaryPos: 0,
+  }),
+
   computed: {
     primary() {
       switch (this.$route.name) {
@@ -31,6 +47,60 @@ export default defineComponent({
       }
     },
   },
+
+  beforeDestroy() {
+    this.pointerUp();
+  },
+
+  methods: {
+    isVertical() {
+      return globalThis.windowInnerWidth <= 768;
+    },
+
+    sepDown(event: PointerEvent) {
+      this.pointerDown = true;
+
+      // Get position of primary element
+      const primary = <HTMLDivElement>this.$refs.primary;
+      const rect = primary.getBoundingClientRect();
+      this.primaryPos = this.isVertical() ? rect.top : rect.left;
+
+      // Let touch handle itself
+      if (event.pointerType === "touch") return;
+
+      // Otherwise, handle pointer events on document
+      document.addEventListener("pointermove", this.documentPointerMove);
+      document.addEventListener("pointerup", this.pointerUp);
+
+      // Prevent text selection
+      event.preventDefault();
+      event.stopPropagation();
+    },
+
+    sepTouchMove(event: TouchEvent) {
+      if (!this.pointerDown) return;
+      this.setFlexBasis(event.touches[0]);
+    },
+
+    documentPointerMove(event: PointerEvent) {
+      if (!this.pointerDown || !event.buttons) return this.pointerUp();
+      this.setFlexBasis(event);
+    },
+
+    pointerUp() {
+      // Get rid of listeners on document quickly
+      this.pointerDown = false;
+      document.removeEventListener("pointermove", this.documentPointerMove);
+      document.removeEventListener("pointerup", this.pointerUp);
+      emit("memories:window:resize", null);
+    },
+
+    setFlexBasis(pos: { clientX: number; clientY: number }) {
+      const ref = this.isVertical() ? pos.clientY : pos.clientX;
+      const newWidth = Math.max(ref - this.primaryPos, 50);
+      (<HTMLDivElement>this.$refs.primary).style.flexBasis = `${newWidth}px`;
+    },
+  },
 });
 </script>
 
@@ -40,29 +110,62 @@ export default defineComponent({
   height: 100%;
   display: flex;
   overflow: hidden;
-}
-.primary {
-  width: 60%;
-  height: 100%;
-}
-.timeline {
-  flex: 1;
-  height: 100%;
-  padding-left: 8px;
+
+  > div {
+    height: 100%;
+    max-height: 100%;
+  }
+
+  > .primary {
+    flex-basis: 60%;
+    flex-shrink: 0;
+  }
+
+  > .timeline {
+    flex-basis: auto;
+    flex-grow: 1;
+    padding-left: 8px;
+    overflow: hidden;
+  }
+
+  > .separator {
+    flex-grow: 0;
+    flex-shrink: 0;
+    width: 5px;
+    background-color: gray;
+    opacity: 0.1;
+    cursor: col-resize;
+    margin: 0 0 0 auto;
+    transition: opacity 0.4s ease-out, background-color 0.4s ease-out;
+  }
+
+  > .separator:hover {
+    opacity: 0.4;
+    background-color: var(--color-primary);
+  }
 }
 
 @media (max-width: 768px) {
   .container {
     flex-direction: column;
-  }
-  .primary {
-    width: 100%;
-    height: 40%;
-  }
-  .timeline {
-    width: 100%;
-    height: 60%;
-    padding-left: 0;
+
+    > div {
+      width: 100%;
+      height: unset;
+    }
+
+    > .primary {
+      flex-basis: 40%;
+    }
+
+    > .timeline {
+      padding-left: 0;
+    }
+
+    > .separator {
+      height: 5px;
+      width: 100%;
+    }
   }
 }
 </style>