diff --git a/client/src/main.js b/client/src/main.js
index d9e9fd0..27be617 100644
--- a/client/src/main.js
+++ b/client/src/main.js
@@ -39,6 +39,16 @@ const markup = `
         <button id="clearBtn" type="button" class="text-xs text-zinc-500 hover:text-red-400 transition-colors font-semibold px-2">Remover</button>
       </div>
 
+      <div id="progressContainer" class="hidden space-y-2 mb-6">
+        <div class="flex justify-between text-[10px] uppercase tracking-wider text-zinc-500 font-bold">
+          <span>Subiendo archivo...</span>
+          <span id="progressPercent">0%</span>
+        </div>
+        <div class="h-1.5 w-full bg-zinc-800 rounded-full overflow-hidden">
+          <div id="progressBar" class="h-full bg-emerald-500 w-0 transition-all duration-300 ease-out shadow-[0_0_8px_rgba(16,185,129,0.5)]"></div>
+        </div>
+      </div>
+
       <button id="submitBtn" type="submit" class="w-full bg-emerald-600 hover:bg-emerald-500 text-white font-semibold py-3 rounded-xl transition-all shadow-lg shadow-emerald-900/20 active:scale-[0.98]">
         Actualizar Cookies
       </button>
@@ -59,6 +69,10 @@ const fileInfo = document.getElementById('fileInfo')
 const fileName = document.getElementById('fileName')
 const clearBtn = document.getElementById('clearBtn')
 const status = document.getElementById('status')
+const submitBtn = document.getElementById('submitBtn')
+const progressContainer = document.getElementById('progressContainer')
+const progressBar = document.getElementById('progressBar')
+const progressPercent = document.getElementById('progressPercent')
 
 function showStatus(text, ok = true) {
   status.textContent = text
@@ -95,17 +109,61 @@ dropZone.addEventListener('drop', (e) => {
 fileInput.addEventListener('change', updateFileInfo)
 clearBtn.addEventListener('click', () => { fileInput.value = ''; updateFileInfo() })
 
-uploadForm.addEventListener('submit', async (e) => {
+uploadForm.addEventListener('submit', (e) => {
   e.preventDefault()
-  if (!fileInput.files || !fileInput.files[0]) return showStatus('Selecciona un archivo .txt primero', false)
-  const fd = new FormData()
-  fd.append('cookies', fileInput.files[0])
-  try {
-    const res = await fetch('/upload-cookies', { method: 'POST', body: fd })
-    const json = await res.json()
-    if (res.ok) showStatus(json.message || 'Subida correcta')
-    else showStatus(json.message || json.error || 'Error al subir', false)
-  } catch (err) {
-    showStatus(err.message || 'Error de red', false)
+
+  if (!fileInput.files || !fileInput.files[0]) {
+    return showStatus('Selecciona un archivo .txt primero', false)
   }
+
+  const file = fileInput.files[0]
+  const fd = new FormData()
+  fd.append('cookies', file)
+
+  // Reset UI
+  status.classList.add('hidden')
+  progressContainer.classList.remove('hidden')
+  progressBar.style.width = '0%'
+  progressPercent.textContent = '0%'
+  submitBtn.disabled = true
+  submitBtn.classList.add('opacity-50', 'cursor-not-allowed')
+
+  const xhr = new XMLHttpRequest()
+
+  xhr.upload.addEventListener('progress', (ev) => {
+    if (ev.lengthComputable) {
+      const percent = Math.round((ev.loaded / ev.total) * 100)
+      progressBar.style.width = percent + '%'
+      progressPercent.textContent = percent + '%'
+    }
+  })
+
+  xhr.onload = () => {
+    submitBtn.disabled = false
+    submitBtn.classList.remove('opacity-50', 'cursor-not-allowed')
+
+    setTimeout(() => {
+      progressContainer.classList.add('hidden')
+      try {
+        const res = JSON.parse(xhr.responseText)
+        if (xhr.status >= 200 && xhr.status < 300) {
+          showStatus(res.message || 'Cookies actualizadas con éxito')
+        } else {
+          showStatus(res.message || 'Error en el servidor', false)
+        }
+      } catch (err) {
+        showStatus('Error al procesar respuesta', false)
+      }
+    }, 500)
+  }
+
+  xhr.onerror = () => {
+    submitBtn.disabled = false
+    submitBtn.classList.remove('opacity-50', 'cursor-not-allowed')
+    progressContainer.classList.add('hidden')
+    showStatus('Error de conexión a la red', false)
+  }
+
+  xhr.open('POST', '/upload-cookies')
+  xhr.send(fd)
 })