diff --git a/package.json b/package.json
index c280a80d..78d71dbf 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
     "core-js": "^3.35.0",
     "cors": "^2.8.5",
     "crc": "^4.3.2",
+    "diff": "^7.0.0",
     "dompurify": "^3.0.8",
     "eventsource-parser": "^1.1.2",
     "exifr": "^7.1.3",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 737a7b4c..dc9791e3 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -101,6 +101,9 @@ importers:
       crc:
         specifier: ^4.3.2
         version: 4.3.2(buffer@6.0.3)
+      diff:
+        specifier: ^7.0.0
+        version: 7.0.0
       dompurify:
         specifier: ^3.0.8
         version: 3.0.8
@@ -1888,6 +1891,10 @@ packages:
     resolution: {integrity: sha512-D+mk+qE8VC/PAUrlAU34N+VfXev0ghe5ywmpqrawphmVZc1bEfn56uo9qpyGp1p4xpzOHkSW4ztBd6L7Xx4ACw==}
     engines: {node: '>=0.3.1'}
 
+  diff@7.0.0:
+    resolution: {integrity: sha512-PJWHUb1RFevKCwaFA9RlG5tCd+FO5iRh9A8HEtkmBH2Li03iJriB6m6JIN4rGz3K3JLawI7/veA1xzRKP6ISBw==}
+    engines: {node: '>=0.3.1'}
+
   dir-glob@3.0.1:
     resolution: {integrity: sha512-WkrWp9GR4KXfKGYzOLmTuGVi1UWFfws377n9cc55/tb6DuqyF6pcQ5AbiHEshaDpY9v6oaSr2XCDidGmMwdzIA==}
     engines: {node: '>=8'}
@@ -5561,6 +5568,8 @@ snapshots:
 
   diff@5.1.0: {}
 
+  diff@7.0.0: {}
+
   dir-glob@3.0.1:
     dependencies:
       path-type: 4.0.0
diff --git a/src/lib/Setting/botpreset.svelte b/src/lib/Setting/botpreset.svelte
index e7f457c6..319bba32 100644
--- a/src/lib/Setting/botpreset.svelte
+++ b/src/lib/Setting/botpreset.svelte
@@ -1,12 +1,14 @@
 <script lang="ts">
-    import { alertCardExport, alertConfirm, alertError } from "../../ts/alert";
+    import { alertCardExport, alertConfirm, alertError, alertMd, alertWait } from "../../ts/alert";
     import { language } from "../../lang";
-    import { changeToPreset, copyPreset, downloadPreset, importPreset } from "../../ts/storage/database.svelte";
+    import { changeToPreset, copyPreset, downloadPreset, importPreset, getDatabase } from "../../ts/storage/database.svelte";
     import { DBState } from 'src/ts/stores.svelte';
-    import { CopyIcon, Share2Icon, PencilIcon, FolderUpIcon, PlusIcon, TrashIcon, XIcon } from "lucide-svelte";
+    import { CopyIcon, Share2Icon, PencilIcon, FolderUpIcon, PlusIcon, TrashIcon, XIcon, GitCompare } from "lucide-svelte";
     import TextInput from "../UI/GUI/TextInput.svelte";
     import { prebuiltPresets } from "src/ts/process/templates/templates";
     import { ShowRealmFrameStore } from "src/ts/stores.svelte";
+    import type { PromptItem, PromptItemPlain, PromptItemChatML, PromptItemTyped, PromptItemAuthorNote, PromptItemChat } from "src/ts/process/prompt.ts";
+    import { diffWordsWithSpace, diffLines } from 'diff';
 
     let editMode = $state(false)
     interface Props {
@@ -15,6 +17,191 @@
 
     let { close = () => {} }: Props = $props();
 
+    let diffMode = false
+    let selectedPrompts: string[] = []
+    let selectedDiffPreset = $state(-1)
+
+    function isPromptItemPlain(item: PromptItem): item is PromptItemPlain {
+        return (
+            item.type === 'plain' || item.type === 'jailbreak' || item.type === 'cot'
+        );
+    }
+
+    function isPromptItemChatML(item: PromptItem): item is PromptItemChatML {
+        return item.type === 'chatML'
+    }
+
+    function isPromptItemTyped(item: PromptItem): item is PromptItemTyped {
+        return (
+            item.type === 'persona' ||
+            item.type === 'description' ||
+            item.type === 'lorebook' ||
+            item.type === 'postEverything' ||
+            item.type === 'memory'
+        )
+    }
+
+    function isPromptItemAuthorNote(item: PromptItem): item is PromptItemAuthorNote {
+        return item.type === 'authornote'
+    }
+
+    function isPromptItemChat(item: PromptItem): item is PromptItemChat {
+        return item.type === 'chat'
+    }
+
+    function escapeHtml(text: string): string {
+        return text
+            .replace(/&/g, '&amp;')
+            .replace(/</g, '&lt;')
+            .replace(/>/g, '&gt;')
+            .replace(/"/g, '&quot;')
+            .replace(/'/g, '&#039;')
+            .replace(/\//g, '&#x2F;')
+            .replace(/\\/g, '&#92;')
+            .replace(/`/g, '&#96;')
+            .replace(/ /g, ' \u200B')
+            .replace(/\n/g, '<br>')
+    }
+
+    function getPrompt(id: number): string {
+        const db = getDatabase()
+        const formated = safeStructuredClone(db.botPresets[id].promptTemplate)
+        let prompt = ''
+
+        for(let i=0;i<formated.length;i++){
+            const item = formated[i]
+
+            switch (true) {
+                case isPromptItemPlain(item):{
+                    prompt += '## ' + (item.role ?? 'Unknown') + '; ' + item.type + '; ' + item.type2 + '\n'
+                    prompt += '\n' + item.text.replaceAll('```', '\\`\\`\\`') + '\n\n'
+                    break
+                }
+
+                case isPromptItemChatML(item):{
+                    prompt += '## ' + item.type + '\n'
+                    prompt += '\n' + item.text.replaceAll('```', '\\`\\`\\`') + '\n\n'
+                    break
+                }
+
+                case isPromptItemTyped(item):{
+                    prompt += '## ' + 'system' + '; ' + item.type + '\n'
+                    if(item.innerFormat){
+                        prompt += '\n' + item.innerFormat.replaceAll('```', '\\`\\`\\`') + '\n\n'
+                    }
+                    break
+                }
+
+                case isPromptItemAuthorNote(item):{
+                    prompt += '## ' + 'system' + '; ' + item.type + '\n'
+                    if(item.innerFormat){
+                        prompt += '\n' + item.innerFormat.replaceAll('```', '\\`\\`\\`') + '\n\n'
+                    }
+                    break
+                }
+
+                case isPromptItemChat(item):{
+                    prompt += '## ' + 'chat' + '; ' + item.type + '\n'
+                    prompt += '\n' + item.rangeStart + ' - ' + item.rangeEnd + '\n\n'
+                    break
+                }
+            }
+
+        }
+
+        return prompt
+    }
+
+    function checkDiff(prompt1: string, prompt2: string): string {
+        const lineDiffs = diffLines(prompt1, prompt2)
+
+        let resultHtml = '';
+
+        for (let i = 0; i < lineDiffs.length; i++) {
+            const linePart = lineDiffs[i]
+
+            if(linePart.removed){
+                const nextPart = lineDiffs[i + 1]
+                if(nextPart?.added){
+                    resultHtml += `<div style="border-left: 4px solid blue; padding-left: 8px;">${highlightChanges(linePart.value, nextPart.value)}</div>`
+                    i++;
+                }
+                else{
+                    resultHtml += `<div style="color: red; background-color: #ffe6e6;">${escapeHtml(linePart.value)}</div>`
+                }
+            }
+            else if(linePart.added){
+                resultHtml += `<div style="color: green; background-color: #e6ffe6;">${escapeHtml(linePart.value)}</div>`
+            }
+            else{
+                resultHtml += `<div>${escapeHtml(linePart.value)}</div>`
+            }
+        }
+
+        if(lineDiffs.length === 1 && !lineDiffs[0].added && !lineDiffs[0].removed) {
+            resultHtml = `<div style="background-color: #4caf50; color: white; padding: 10px 20px; border-radius: 5px; text-align: center;">No differences detected.</div>` + resultHtml
+        }
+        else{
+            resultHtml = `<div style="background-color: #ff9800; color: white; padding: 10px 20px; border-radius: 5px; text-align: center;">Differences detected. Please review the changes.</div>` + resultHtml
+        }
+
+        return resultHtml
+    }
+
+    function highlightChanges(string1: string, string2: string) {
+        const charDiffs = diffWordsWithSpace(string1, string2)
+
+        return charDiffs
+            .map(charPart => {
+                const escapedText = escapeHtml(charPart.value)
+
+                if (charPart.added) {
+                    return `<span style="color: green; background-color: #e6ffe6;">${escapedText}</span>`
+                }
+                else if(charPart.removed) {
+                    return `<span style="color: red; background-color: #ffe6e6;">${escapedText}</span>`
+                }
+                else{
+                    return escapedText
+                }
+            })
+            .join('')
+    }
+    
+
+    function handleDiffMode(id: number) {
+        if (selectedDiffPreset === id) {
+            selectedDiffPreset = -1
+            selectedPrompts = []
+            diffMode = !diffMode
+            return
+        } else {
+            selectedDiffPreset = id
+        }
+
+        const prompt = getPrompt(id)
+
+        if(!prompt){
+            return
+        }
+        
+        if(!diffMode){
+            selectedPrompts = [prompt]
+        }
+        else if(selectedPrompts.length === 0){
+            return
+        }
+        else{
+            alertWait("Loading...")
+            const result = checkDiff(selectedPrompts[0], prompt)
+            alertMd(result)
+            selectedDiffPreset = -1
+            selectedPrompts = []
+        }
+
+        diffMode = !diffMode
+    }
+
 </script>
 
 <div class="absolute w-full h-full z-40 bg-black bg-opacity-50 flex justify-center items-center">
@@ -47,6 +234,16 @@
                     <span>{preset.name}</span>
                 {/if}
                 <div class="flex-grow flex justify-end">
+                    <div class="{selectedDiffPreset === i ? 'text-green-500' : 'text-textcolor2 hover:text-green-500'} cursor-pointer mr-2" role="button" tabindex="0" onclick={(e) => {
+                        e.stopPropagation()
+                        handleDiffMode(i)
+                    }} onkeydown={(e) => {
+                        if(e.key === 'Enter'){
+                            e.currentTarget.click()
+                        }
+                    }}>
+                        <GitCompare size={18}/>
+                    </div>
                     <div class="text-textcolor2 hover:text-green-500 cursor-pointer mr-2" role="button" tabindex="0" onclick={(e) => {
                         e.stopPropagation()
                         copyPreset(i)