diff --git a/backend/dao/user.js b/backend/dao/user.js
index abfa6c645..86e4ebcef 100644
--- a/backend/dao/user.js
+++ b/backend/dao/user.js
@@ -1,8 +1,8 @@
 const MonkeyError = require("../handlers/error");
 const { mongoDB } = require("../init/mongodb");
+const { ObjectID } = require("mongodb");
 const { checkAndUpdatePb } = require("../handlers/pb");
 const { updateAuthEmail } = require("../handlers/auth");
-const uuid = require("uuid");
 
 class UsersDAO {
   static async addUser(name, email, uid) {
@@ -53,12 +53,12 @@ class UsersDAO {
   }
 
   static async addTag(uid, name) {
-    let id = uuid.v4();
+    let _id = ObjectID();
     await mongoDB()
       .collection("users")
-      .updateOne({ uid }, { $push: { tags: { id, name } } });
+      .updateOne({ uid }, { $push: { tags: { _id, name } } });
     return {
-      id,
+      _id,
       name,
     };
   }
@@ -69,12 +69,12 @@ class UsersDAO {
     return user.tags;
   }
 
-  static async editTag(uid, id, name) {
+  static async editTag(uid, _id, name) {
     const user = await mongoDB().collection("users").findOne({ uid });
     if (!user) throw new MonkeyError(404, "User not found");
     if (
       user.tags === undefined ||
-      user.tags.filter((t) => t.id === id).length === 0
+      user.tags.filter((t) => t._id == _id).length === 0
     )
       throw new MonkeyError(404, "Tag not found");
     return await mongoDB()
@@ -82,18 +82,18 @@ class UsersDAO {
       .updateOne(
         {
           uid: uid,
-          "tags.id": id,
+          "tags._id": ObjectID(_id),
         },
         { $set: { "tags.$.name": name } }
       );
   }
 
-  static async removeTag(uid, id) {
+  static async removeTag(uid, _id) {
     const user = await mongoDB().collection("users").findOne({ uid });
     if (!user) throw new MonkeyError(404, "User not found");
     if (
       user.tags === undefined ||
-      user.tags.filter((t) => t.id === id).length === 0
+      user.tags.filter((t) => t._id == _id).length === 0
     )
       throw new MonkeyError(404, "Tag not found");
     return await mongoDB()
@@ -101,18 +101,18 @@ class UsersDAO {
       .updateOne(
         {
           uid: uid,
-          "tags.id": id,
+          "tags._id": ObjectID(_id),
         },
-        { $pull: { tags: { id } } }
+        { $pull: { tags: { _id: ObjectID(_id) } } }
       );
   }
 
-  static async removeTagPb(uid, id) {
+  static async removeTagPb(uid, _id) {
     const user = await mongoDB().collection("users").findOne({ uid });
     if (!user) throw new MonkeyError(404, "User not found");
     if (
       user.tags === undefined ||
-      user.tags.filter((t) => t.id === id).length === 0
+      user.tags.filter((t) => t._id == _id).length === 0
     )
       throw new MonkeyError(404, "Tag not found");
     return await mongoDB()
@@ -120,7 +120,7 @@ class UsersDAO {
       .updateOne(
         {
           uid: uid,
-          "tags.id": id,
+          "tags._id": ObjectID(_id),
         },
         { $set: { "tags.$.personalBests": {} } }
       );
@@ -197,7 +197,7 @@ class UsersDAO {
 
     let tagsToCheck = [];
     user.tags.forEach((tag) => {
-      if (tags.includes(tag.id)) {
+      if (tags.includes(tag._id)) {
         tagsToCheck.push(tag);
       }
     });
@@ -218,11 +218,11 @@ class UsersDAO {
         wpm
       );
       if (tagpb.isPb) {
-        ret.push(tag.id);
+        ret.push(tag._id);
         await mongoDB()
           .collection("users")
           .updateOne(
-            { uid, "tags.id": tag.id },
+            { uid, "tags._id": ObjectID(tag._id) },
             { $set: { "tags.$.personalBests": tagpb.obj } }
           );
       }
diff --git a/src/js/account.js b/src/js/account.js
index b4d306f6f..f7e7e69f0 100644
--- a/src/js/account.js
+++ b/src/js/account.js
@@ -233,7 +233,7 @@ function loadMoreLines(lineIndex) {
     if (result.tags !== undefined && result.tags.length > 0) {
       result.tags.forEach((tag) => {
         DB.getSnapshot().tags.forEach((snaptag) => {
-          if (tag === snaptag.id) {
+          if (tag === snaptag._id) {
             tagNames += snaptag.name + ", ";
           }
         });
diff --git a/src/js/account/result-filters.js b/src/js/account/result-filters.js
index b85a32bd5..03c87ab3f 100644
--- a/src/js/account/result-filters.js
+++ b/src/js/account/result-filters.js
@@ -99,7 +99,7 @@ export function getFilter(group, filter) {
 
 export function loadTags(tags) {
   tags.forEach((tag) => {
-    defaultResultFilters.tags[tag.id] = true;
+    defaultResultFilters.tags[tag._id] = true;
   });
 }
 
@@ -305,7 +305,7 @@ export function updateTags() {
     DB.getSnapshot().tags.forEach((tag) => {
       $(
         ".pageAccount .content .filterButtons .buttonsAndTitle.tags .buttons"
-      ).append(`<div class="button" filter="${tag.id}">${tag.name}</div>`);
+      ).append(`<div class="button" filter="${tag._id}">${tag.name}</div>`);
     });
   } else {
     $(".pageAccount .content .filterButtons .buttonsAndTitle.tags").addClass(
@@ -412,7 +412,7 @@ $(".pageAccount .topFilters .button.currentConfigFilter").click((e) => {
   DB.getSnapshot().tags.forEach((tag) => {
     if (tag.active === true) {
       filters["tags"]["none"] = false;
-      filters["tags"][tag.id] = true;
+      filters["tags"][tag._id] = true;
     }
   });
 
diff --git a/src/js/commandline-lists.js b/src/js/commandline-lists.js
index 8294b1a44..ca34d6d0e 100644
--- a/src/js/commandline-lists.js
+++ b/src/js/commandline-lists.js
@@ -227,12 +227,12 @@ export function updateTagCommands() {
       }
 
       commandsTags.list.push({
-        id: "toggleTag" + tag.id,
+        id: "toggleTag" + tag._id,
         noIcon: true,
         display: dis,
         sticky: true,
         exec: () => {
-          TagController.toggle(tag.id);
+          TagController.toggle(tag._id);
           TestUI.updateModesNotice();
           let txt = tag.name;
 
@@ -243,14 +243,14 @@ export function updateTagCommands() {
           }
           if (Commandline.isSingleListCommandLineActive()) {
             $(
-              `#commandLine .suggestions .entry[command='toggleTag${tag.id}']`
+              `#commandLine .suggestions .entry[command='toggleTag${tag._id}']`
             ).html(
               `<div class="icon"><i class="fas fa-fw fa-tag"></i></div><div>Tags  > ` +
                 txt
             );
           } else {
             $(
-              `#commandLine .suggestions .entry[command='toggleTag${tag.id}']`
+              `#commandLine .suggestions .entry[command='toggleTag${tag._id}']`
             ).html(txt);
           }
         },
diff --git a/src/js/popups/edit-preset-popup.js b/src/js/popups/edit-preset-popup.js
index ade00131a..57fbdbcb4 100644
--- a/src/js/popups/edit-preset-popup.js
+++ b/src/js/popups/edit-preset-popup.js
@@ -73,7 +73,7 @@ async function apply() {
   let activeTagIds = [];
   DB.getSnapshot().tags.forEach((tag) => {
     if (tag.active) {
-      activeTagIds.push(tag.id);
+      activeTagIds.push(tag._id);
     }
   });
   configChanges.tags = activeTagIds;
diff --git a/src/js/popups/edit-tags-popup.js b/src/js/popups/edit-tags-popup.js
index 3e0385bd7..f2fde525c 100644
--- a/src/js/popups/edit-tags-popup.js
+++ b/src/js/popups/edit-tags-popup.js
@@ -90,7 +90,7 @@ async function apply() {
       Notifications.add("Tag added", 1);
       DB.getSnapshot().tags.push({
         name: response.data.name,
-        id: response.data.id,
+        _id: response.data._id,
       });
       ResultTagsPopup.updateButtons();
       Settings.update();
@@ -116,7 +116,7 @@ async function apply() {
     } else {
       Notifications.add("Tag updated", 1);
       DB.getSnapshot().tags.forEach((tag) => {
-        if (tag.id === tagid) {
+        if (tag._id === tagid) {
           tag.name = inputVal;
         }
       });
@@ -141,7 +141,7 @@ async function apply() {
     } else {
       Notifications.add("Tag removed", 1);
       DB.getSnapshot().tags.forEach((tag, index) => {
-        if (tag.id === tagid) {
+        if (tag._id === tagid) {
           DB.getSnapshot().tags.splice(index, 1);
         }
       });
@@ -166,7 +166,7 @@ async function apply() {
     } else {
       Notifications.add("Tag PB cleared", 1);
       DB.getSnapshot().tags.forEach((tag, index) => {
-        if (tag.id === tagid) {
+        if (tag._id === tagid) {
           tag.personalBests = {};
         }
       });
diff --git a/src/js/popups/result-tags-popup.js b/src/js/popups/result-tags-popup.js
index 93826a793..43daa948a 100644
--- a/src/js/popups/result-tags-popup.js
+++ b/src/js/popups/result-tags-popup.js
@@ -34,7 +34,7 @@ export function updateButtons() {
   $("#resultEditTagsPanel .buttons").empty();
   DB.getSnapshot().tags.forEach((tag) => {
     $("#resultEditTagsPanel .buttons").append(
-      `<div class="button tag" tagid="${tag.id}">${tag.name}</div>`
+      `<div class="button tag" tagid="${tag._id}">${tag.name}</div>`
     );
   });
 }
@@ -105,7 +105,7 @@ $("#resultEditTagsPanel .confirmButton").click((e) => {
         if (newtags.length > 0) {
           newtags.forEach((tag) => {
             DB.getSnapshot().tags.forEach((snaptag) => {
-              if (tag === snaptag.id) {
+              if (tag === snaptag._id) {
                 tagNames += snaptag.name + ", ";
               }
             });
diff --git a/src/js/settings.js b/src/js/settings.js
index 058f223bc..509458ff2 100644
--- a/src/js/settings.js
+++ b/src/js/settings.js
@@ -422,7 +422,7 @@ function refreshTagsSettingsSection() {
       }
       tagsEl.append(`
 
-      <div class="buttons tag" id="${tag.id}">
+      <div class="buttons tag" id="${tag._id}">
         <div class="button tagButton ${tag.active ? "active" : ""}" active="${
         tag.active
       }">
diff --git a/src/js/tag-controller.js b/src/js/tag-controller.js
index 8327338d8..21cc36a36 100644
--- a/src/js/tag-controller.js
+++ b/src/js/tag-controller.js
@@ -7,7 +7,7 @@ export function saveActiveToLocalStorage() {
   try {
     DB.getSnapshot().tags.forEach((tag) => {
       if (tag.active === true) {
-        tags.push(tag.id);
+        tags.push(tag._id);
       }
     });
     // let d = new Date();
@@ -31,7 +31,7 @@ export function clear(nosave = false) {
 
 export function set(tagid, state, nosave = false) {
   DB.getSnapshot().tags.forEach((tag) => {
-    if (tag.id === tagid) {
+    if (tag._id === tagid) {
       tag.active = state;
     }
   });
@@ -41,7 +41,7 @@ export function set(tagid, state, nosave = false) {
 
 export function toggle(tagid, nosave = false) {
   DB.getSnapshot().tags.forEach((tag) => {
-    if (tag.id === tagid) {
+    if (tag._id === tagid) {
       if (tag.active === undefined) {
         tag.active = true;
       } else {
diff --git a/src/js/test/test-logic.js b/src/js/test/test-logic.js
index b23962378..ea13693d5 100644
--- a/src/js/test/test-logic.js
+++ b/src/js/test/test-logic.js
@@ -1437,7 +1437,7 @@ export function finish(difficultyFailed = false) {
       DB.getSnapshot().tags.forEach((tag) => {
         if (tag.active === true) {
           activeTags.push(tag);
-          activeTagsIds.push(tag.id);
+          activeTagsIds.push(tag._id);
         }
       });
     } catch (e) {}
@@ -1605,7 +1605,7 @@ export function finish(difficultyFailed = false) {
             let annotationSide = "left";
             activeTags.forEach(async (tag) => {
               let tpb = await DB.getLocalTagPB(
-                tag.id,
+                tag._id,
                 Config.mode,
                 mode2,
                 Config.punctuation,
@@ -1613,13 +1613,13 @@ export function finish(difficultyFailed = false) {
                 Config.difficulty
               );
               $("#result .stats .tags .bottom").append(`
-                <div tagid="${tag.id}" aria-label="PB: ${tpb}" data-balloon-pos="up">${tag.name}<i class="fas fa-crown hidden"></i></div>
+                <div tagid="${tag._id}" aria-label="PB: ${tpb}" data-balloon-pos="up">${tag.name}<i class="fas fa-crown hidden"></i></div>
               `);
               if (Config.mode != "quote") {
                 if (tpb < stats.wpm) {
                   //new pb for that tag
                   DB.saveLocalTagPB(
-                    tag.id,
+                    tag._id,
                     Config.mode,
                     mode2,
                     Config.punctuation,
@@ -1631,12 +1631,11 @@ export function finish(difficultyFailed = false) {
                     consistency
                   );
                   $(
-                    `#result .stats .tags .bottom div[tagid="${tag.id}"] .fas`
+                    `#result .stats .tags .bottom div[tagid="${tag._id}"] .fas`
                   ).removeClass("hidden");
-                  $(`#result .stats .tags .bottom div[tagid="${tag.id}"]`).attr(
-                    "aria-label",
-                    "+" + Misc.roundTo2(stats.wpm - tpb)
-                  );
+                  $(
+                    `#result .stats .tags .bottom div[tagid="${tag._id}"]`
+                  ).attr("aria-label", "+" + Misc.roundTo2(stats.wpm - tpb));
                   // console.log("new pb for tag " + tag.name);
                 } else {
                   ChartController.result.options.annotation.annotations.push({