diff --git a/scripts/videoplayer.js b/scripts/videoplayer.js
index edc6167..5dc4822 100644
--- a/scripts/videoplayer.js
+++ b/scripts/videoplayer.js
@@ -22,6 +22,28 @@ let autoPlayEnabled = true;
 let currentTranslationMode = 'letters'; // Default mode
 translateBtn.disabled = true;
 
+// Function to lemmatize text via NLP4SK API
+async function lemmatizeText(text) {
+    try {
+        const response = await fetch('http://arl6.library.sk/nlp4sk/api/lematizacia', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ text }),
+        });
+
+        if (!response.ok) {
+            throw new Error('Chyba pri volaní lematizačného API');
+        }
+
+        const data = await response.json();
+        return data.result || text; // Return lemmatized text or original if no result
+    } catch (error) {
+        console.error('Chyba pri lematizácii:', error);
+        statusText.innerText = 'Chyba pri lematizácii, použije sa pôvodný text.';
+        return text; // Fallback to original text on error
+    }
+}
+
 // Function to check if video exists (for local testing)
 async function videoExists(src) {
     return new Promise(resolve => {
@@ -143,6 +165,10 @@ if (currentTranslationMode === 'letters') {
 translateBtn.addEventListener('click', async () => {
     autoPlayEnabled = true;
 
+    // Lematizácia vstupu
+    const lemmatizedText = await lemmatizeText(inputText.value);
+    inputText.value = lemmatizedText; // Update input field with lemmatized text
+
     // Load the video sequence based on the current translation mode
     if (currentTranslationMode === 'words') {
         await loadVideoSequenceByWords();