diff --git a/README.md b/README.md
index ca72cd7..170fdaf 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,6 @@ This is an Extension for the [Automatic1111 Webui](https://github.com/AUTOMATIC1
 ## What is This ?
 - Sometimes when you are typing too fast or are copying tags from all over the places, you end up with duplicated spaces or commas.
 - This simple script helps removing them whenever you click **Generate**.
-- Works for both `txt2img` and `img2img`.
+- Works in both `txt2img` and `img2img`.
+- You can now toggle `Remove Duplicates` to remove duplicated tags from the prompts 
+  - **Note:** Only works for tag-based prompt *(**eg.** 1girl, solo, smile, 1girl)*, but not for sentence-based prompt *(**eg.** a girl smiling, a girl standing)*
diff --git a/javascript/prompt_format.js b/javascript/prompt_format.js
index 9ce1404..530602a 100644
--- a/javascript/prompt_format.js
+++ b/javascript/prompt_format.js
@@ -14,23 +14,50 @@ class LeFormatter {
 		i2i_button.addEventListener('click', onClick)
 	}
 
+	static checkbox(text, { onChange }) {
+		const label = document.createElement('label')
+		label.style.display = 'flex'
+		label.style.alignItems = 'center'
+
+		const checkbox = gradioApp().querySelector('input[type=checkbox]').cloneNode()
+		checkbox.addEventListener('change', (event) => {
+			onChange(event.target.checked)
+		})
+
+		const span = document.createElement('span')
+		span.style.marginLeft = 'var(--size-2, 4px)'
+		span.textContent = text
+
+		label.appendChild(checkbox)
+		label.appendChild(span)
+
+		return label
+	}
 }
 
 
 onUiLoaded(async () => {
+	this.dedupe = false
+
+	const tools = document.getElementById('txt2img_tools')
+	const checkbox = LeFormatter.checkbox('Remove Duplicates', {
+		onChange: (checked) => { this.dedupe = checked }
+	})
+	tools.appendChild(checkbox)
 
 	LeFormatter.injectTxt2ImgButton({
 		onClick: () => {
 			const idP = 'txt2img_prompt'
 			const textareaP = gradioApp().getElementById(idP).querySelector('textarea')
 			const tagsP = textareaP.value.split(',').map(word => word.trim()).filter(word => word !== '');
-			const sentenceP = tagsP.join(', ');
+			const sentenceP = this.dedupe ? [...new Set(tagsP)].join(', ') : tagsP.join(', ');
 			textareaP.value = sentenceP.replace(/\s+/g, ' ').trim();
 			updateInput(textareaP)
+
 			const idN = 'txt2img_neg_prompt'
 			const textareaN = gradioApp().getElementById(idN).querySelector('textarea')
 			const tagsN = textareaN.value.split(',').map(word => word.trim()).filter(word => word !== '');
-			const sentenceN = tagsN.join(', ');
+			const sentenceN = this.dedupe ? [...new Set(tagsN)].join(', ') : tagsN.join(', ');
 			textareaN.value = sentenceN.replace(/\s+/g, ' ').trim();
 			updateInput(textareaN)
 		}
@@ -41,13 +68,14 @@ onUiLoaded(async () => {
 			const idP = 'img2img_prompt'
 			const textareaP = gradioApp().getElementById(idP).querySelector('textarea')
 			const tagsP = textareaP.value.split(',').map(word => word.trim()).filter(word => word !== '');
-			const sentenceP = tagsP.join(', ');
+			const sentenceP = this.dedupe ? [...new Set(tagsP)].join(', ') : tagsP.join(', ');
 			textareaP.value = sentenceP.replace(/\s+/g, ' ').trim();
 			updateInput(textareaP)
+
 			const idN = 'img2img_neg_prompt'
 			const textareaN = gradioApp().getElementById(idN).querySelector('textarea')
 			const tagsN = textareaN.value.split(',').map(word => word.trim()).filter(word => word !== '');
-			const sentenceN = tagsN.join(', ');
+			const sentenceN = this.dedupe ? [...new Set(tagsN)].join(', ') : tagsN.join(', ');
 			textareaN.value = sentenceN.replace(/\s+/g, ' ').trim();
 			updateInput(textareaN)
 		}