diff --git a/src/public/app/dialogs/delete_notes.js b/src/public/app/dialogs/delete_notes.js
index 35eb880f5..dc1903adc 100644
--- a/src/public/app/dialogs/delete_notes.js
+++ b/src/public/app/dialogs/delete_notes.js
@@ -1,25 +1,61 @@
+import server from "../services/server.js";
+import treeCache from "../services/tree_cache.js";
+import linkService from "../services/link.js";
+
 const $dialog = $("#delete-notes-dialog");
 const $confirmContent = $("#delete-notes-dialog-content");
 const $okButton = $("#delete-notes-dialog-ok-button");
 const $cancelButton = $("#delete-notes-dialog-cancel-button");
 const $custom = $("#delete-notes-dialog-custom");
+const $deleteNotesList = $("#delete-notes-list");
+const $brokenRelationsList = $("#broken-relations-list");
+const $deletedNotesCount = $("#deleted-notes-count");
+const $noNoteToDeleteWrapper = $("#no-note-to-delete-wrapper");
+const $deleteNotesListWrapper = $("#delete-notes-list-wrapper");
+const $brokenRelationsListWrapper = $("#broken-relations-wrapper");
 
 const DELETE_NOTE_BUTTON_ID = "delete-notes-dialog-delete-note";
 
 let $originallyFocused; // element focused before the dialog was opened so we can return to it afterwards
 
-export function showDialog(message) {
+export async function showDialog(branchIdsToDelete) {
     $originallyFocused = $(':focus');
 
     $custom.hide();
 
     glob.activeDialog = $dialog;
 
-    if (typeof message === 'string') {
-        message = $("<div>").text(message);
+    const response = await server.post('delete-notes-preview', {branchIdsToDelete});
+
+    $deleteNotesList.empty();
+    $brokenRelationsList.empty();
+
+    $deleteNotesListWrapper.toggle(response.noteIdsToBeDeleted.length > 0);
+    $noNoteToDeleteWrapper.toggle(response.noteIdsToBeDeleted.length === 0);
+
+    for (const note of await treeCache.getNotes(response.noteIdsToBeDeleted)) {
+        $deleteNotesList.append(
+            $("<li>").append(
+                await linkService.createNoteLink(note.noteId, {showNotePath: true})
+            )
+        );
     }
 
-    $confirmContent.empty().append(message);
+    $deletedNotesCount.text(response.noteIdsToBeDeleted.length);
+
+    $brokenRelationsListWrapper.toggle(response.brokenRelations.length > 0);
+
+    await treeCache.getNotes(response.brokenRelations.map(br => br.noteId));
+
+    for (const attr of response.brokenRelations) {
+        $brokenRelationsList.append(
+            $("<li>")
+                .append(`Note `)
+                .append(await linkService.createNoteLink(attr.value))
+                .append(` (to be deleted) is referenced by relation <code>${attr.name}</code> originating from `)
+                .append(await linkService.createNoteLink(attr.noteId))
+        );
+    }
 
     $dialog.modal();
 
diff --git a/src/public/app/services/branches.js b/src/public/app/services/branches.js
index 8f368626b..66fdb0f7d 100644
--- a/src/public/app/services/branches.js
+++ b/src/public/app/services/branches.js
@@ -75,7 +75,7 @@ async function deleteNotes(branchIdsToDelete) {
     }
 
     const deleteNotesDialog = await import("../dialogs/delete_notes.js");
-    deleteNotesDialog.showDialog();
+    deleteNotesDialog.showDialog(branchIdsToDelete);
 
     const $deleteClonesCheckbox = $('<div class="form-check">')
         .append($('<input type="checkbox" class="form-check-input" id="delete-clones-checkbox">'))
diff --git a/src/routes/api/notes.js b/src/routes/api/notes.js
index 370058eaf..5f997a737 100644
--- a/src/routes/api/notes.js
+++ b/src/routes/api/notes.js
@@ -3,6 +3,7 @@
 const noteService = require('../../services/notes');
 const treeService = require('../../services/tree');
 const repository = require('../../services/repository');
+const sql = require('../../services/sql');
 const utils = require('../../services/utils');
 const log = require('../../services/log');
 const TaskContext = require('../../services/task_context');
@@ -220,6 +221,58 @@ function eraseDeletedNotesNow() {
     noteService.eraseDeletedNotesNow();
 }
 
+function getDeleteNotesPreview(req) {
+    const {branchIdsToDelete} = req.body;
+
+    const noteIdsToBeDeleted = new Set();
+    const branchCountToDelete = {}; // noteId => count (integer)
+
+    function branchPreviewDeletion(branch) {
+        branchCountToDelete[branch.branchId] = branchCountToDelete[branch.branchId] || 0;
+        branchCountToDelete[branch.branchId]++;
+
+        const note = branch.getNote();
+
+        if (note.getBranches().length <= branchCountToDelete[branch.branchId]) {
+            noteIdsToBeDeleted.add(note.noteId);
+
+            for (const childBranch of note.getChildBranches()) {
+                branchPreviewDeletion(childBranch);
+            }
+        }
+    }
+
+    for (const branchId of branchIdsToDelete) {
+        const branch = repository.getBranch(branchId);
+
+        if (!branch) {
+            log.error(`Branch ${branchId} was not found and delete preview can't be calculated for this note.`);
+
+            continue;
+        }
+
+        branchPreviewDeletion(branch);
+    }
+
+    let brokenRelations = [];
+
+    if (noteIdsToBeDeleted.length > 0) {
+        sql.fillParamList(noteIdsToBeDeleted);
+
+        brokenRelations = sql.getRows(`
+            SELECT attr.noteId, attr.name, attr.value
+            FROM attributes attr
+                     JOIN param_list ON param_list.paramId = attr.value
+            WHERE attr.isDeleted = 0
+              AND attr.type = 'relation'`).filter(attr => !noteIdsToBeDeleted.has(attr.noteId));
+    }
+
+    return {
+        noteIdsToBeDeleted: Array.from(noteIdsToBeDeleted),
+        brokenRelations
+    };
+}
+
 module.exports = {
     getNote,
     updateNote,
@@ -232,5 +285,6 @@ module.exports = {
     getRelationMap,
     changeTitle,
     duplicateSubtree,
-    eraseDeletedNotesNow
+    eraseDeletedNotesNow,
+    getDeleteNotesPreview
 };
diff --git a/src/routes/api/stats.js b/src/routes/api/stats.js
index 1bd030367..a00b87cee 100644
--- a/src/routes/api/stats.js
+++ b/src/routes/api/stats.js
@@ -31,7 +31,7 @@ function getSubtreeSize(req) {
 
     const subTreeNoteIds = note.subtreeNotes.map(note => note.noteId);
 
-    sql.fillNoteIdList(subTreeNoteIds);
+    sql.fillParamList(subTreeNoteIds);
 
     const subTreeSize = sql.getValue(`
         SELECT
diff --git a/src/routes/routes.js b/src/routes/routes.js
index 006edfbe9..9fdfa0abf 100644
--- a/src/routes/routes.js
+++ b/src/routes/routes.js
@@ -290,6 +290,8 @@ function register(app) {
     apiRoute(GET, '/api/stats/note-size/:noteId', statsRoute.getNoteSize);
     apiRoute(GET, '/api/stats/subtree-size/:noteId', statsRoute.getSubtreeSize);
 
+    apiRoute(POST, '/api/delete-notes-preview', notesApiRoute.getDeleteNotesPreview);
+
     app.use('', router);
 }
 
diff --git a/src/services/sql.js b/src/services/sql.js
index 5ba56f8cc..69cc8b99a 100644
--- a/src/services/sql.js
+++ b/src/services/sql.js
@@ -246,8 +246,8 @@ function transactional(func) {
     }
 }
 
-function fillNoteIdList(noteIds, truncate = true) {
-    if (noteIds.length === 0) {
+function fillParamList(paramIds, truncate = true) {
+    if (paramIds.length === 0) {
         return;
     }
 
@@ -255,18 +255,18 @@ function fillNoteIdList(noteIds, truncate = true) {
         execute("DELETE FROM param_list");
     }
 
-    noteIds = Array.from(new Set(noteIds));
+    paramIds = Array.from(new Set(paramIds));
 
-    if (noteIds.length > 30000) {
-        fillNoteIdList(noteIds.slice(30000), false);
+    if (paramIds.length > 30000) {
+        fillParamList(paramIds.slice(30000), false);
 
-        noteIds = noteIds.slice(0, 30000);
+        paramIds = paramIds.slice(0, 30000);
     }
 
     // doing it manually to avoid this showing up on the sloq query list
-    const s = stmt(`INSERT INTO param_list VALUES ` + noteIds.map(noteId => `(?)`).join(','), noteIds);
+    const s = stmt(`INSERT INTO param_list VALUES ` + paramIds.map(paramId => `(?)`).join(','), paramIds);
 
-    s.run(noteIds);
+    s.run(paramIds);
 }
 
 module.exports = {
@@ -287,5 +287,5 @@ module.exports = {
     executeScript,
     transactional,
     upsert,
-    fillNoteIdList
+    fillParamList
 };
diff --git a/src/views/dialogs/delete_notes.ejs b/src/views/dialogs/delete_notes.ejs
index 4fab2f68d..81a0db7e4 100644
--- a/src/views/dialogs/delete_notes.ejs
+++ b/src/views/dialogs/delete_notes.ejs
@@ -1,5 +1,5 @@
 <div id="delete-notes-dialog" class="modal mx-auto" tabindex="-1" role="dialog">
-    <div class="modal-dialog modal-dialog-scrollable" role="document">
+    <div class="modal-dialog modal-dialog-scrollable modal-xl" role="document">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title mr-auto">Delete notes</h5>
@@ -9,7 +9,23 @@
                 </button>
             </div>
             <div class="modal-body">
-                ... delete
+                <div id="delete-notes-list-wrapper">
+                    <h5>Following notes will be deleted (<span id="deleted-notes-count"></span>)</h5>
+
+                    <ul id="delete-notes-list" style="max-height: 400px; overflow: auto;"></ul>
+                </div>
+
+                <div id="no-note-to-delete-wrapper">
+                    <strong>No note will be deleted (only clones).</strong>
+                </div>
+
+                <div id="broken-relations-wrapper">
+                    <h5>Broken relations</h5>
+
+                    Below can be seen relations which will be broken after notes mentioned above are deleted.
+
+                    <ul id="broken-relations-list" style="max-height: 400px; overflow: auto;"></ul>
+                </div>
             </div>
             <div class="modal-footer">
                 <button class="btn btn-sm" id="delete-notes-dialog-cancel-button">Cancel</button>