diff --git a/player/lua/osc.lua b/player/lua/osc.lua
index fba6e88..8ed2bf8 100644
--- a/player/lua/osc.lua
+++ b/player/lua/osc.lua
@@ -130,6 +130,12 @@ local state = {
     chapter_list = {},                      -- sorted by time
 }
 
+local thumbfast = {
+    width = 0,
+    height = 0,
+    disabled = false
+}
+
 local window_control_box_width = 80
 local tick_delay = 0.03
 
@@ -832,6 +838,22 @@ function render_elements(master_ass)
                     ass_append_alpha(elem_ass, slider_lo.alpha, 0)
                     elem_ass:append(tooltiplabel)
 
+                    -- thumbnail
+                    if not thumbfast.disabled and thumbfast.width ~= 0 and thumbfast.height ~= 0 then
+                        local osd_w = mp.get_property_number("osd-dimensions/w")
+                        if osd_w then
+                            local r_w, r_h = get_virt_scale_factor()
+                            mp.commandv("script-message-to", "thumbfast", "thumb",
+                                mp.get_property_number("duration", 0) * (sliderpos / 100),
+                                math.min(osd_w - thumbfast.width - 10, math.max(10, tx / r_w - thumbfast.width / 2)),
+                                ((ty - (user_opts.layout == "bottombar" and 39 or 18) - user_opts.barmargin) / r_h - (user_opts.layout == "topbar" and -(57 + user_opts.barmargin) / r_h or thumbfast.height))
+                            )
+                        end
+                    end
+                else
+                    if thumbfast.width ~= 0 and thumbfast.height ~= 0 then
+                        mp.commandv("script-message-to", "thumbfast", "clear")
+                    end
                 end
             end
 
@@ -2889,5 +2911,14 @@ mp.add_key_binding(nil, "visibility", function() visibility_mode("cycle") end)
 
 mp.register_script_message("osc-idlescreen", idlescreen_visibility)
 
+mp.register_script_message("thumbfast-info", function(json)
+    local data = utils.parse_json(json)
+    if type(data) ~= "table" or not data.width or not data.height then
+        msg.error("thumbfast-info: received json didn't produce a table with thumbnail information")
+    else
+        thumbfast = data
+    end
+end)
+
 set_virt_mouse_area(0, 0, 0, 0, "input")
 set_virt_mouse_area(0, 0, 0, 0, "window-controls")