diff --git a/cli/fetch_tags.py b/cli/fetch_tags.py
index 5de5edfd1..1b048a581 100644
--- a/cli/fetch_tags.py
+++ b/cli/fetch_tags.py
@@ -71,7 +71,7 @@ MAX_RETRIES = 3
 RETRY_BACKOFF = 5  # seconds, multiplied by attempt number
 
 
-# ── Partial save/resume ──
+# -- Partial save/resume --
 
 def save_partial(path: str, page: int, tags: list):
     """Save fetch progress to a .partial file."""
@@ -105,7 +105,7 @@ def clear_partial(path: str):
         os.remove(path)
 
 
-# ── HTTP retry helper ──
+# -- HTTP retry helper --
 
 def fetch_with_retry(session: requests.Session, url: str, params: dict | None = None, timeout: int = 30) -> requests.Response:
     """GET with retry and exponential backoff for transient errors."""
@@ -123,7 +123,7 @@ def fetch_with_retry(session: requests.Session, url: str, params: dict | None =
                 raise
 
 
-# ── Fetchers ──
+# -- Fetchers --
 
 def fetch_danbooru(min_count: int = 10, partial_path: str = "", **_kwargs) -> list:
     """Fetch tags from Danbooru API, paginated."""
diff --git a/javascript/autocomplete.js b/javascript/autocomplete.js
new file mode 100644
index 000000000..ccf6a5ebc
--- /dev/null
+++ b/javascript/autocomplete.js
@@ -0,0 +1,430 @@
+/*
+ * Tag autocomplete for SD.Next prompt textareas.
+ *
+ * Ported from Enso's CodeMirror-based autocomplete (autocomplete.ts).
+ * Uses binary search on sorted tag arrays for O(log n) prefix lookup,
+ * with substring fallback for 4+ char queries.
+ */
+
+// -- Category colors (unified 14-category scheme) --
+
+const CATEGORY_COLORS = {
+  0: '#0075f8', // general
+  1: '#cc0000', // artist
+  2: '#ff4500', // studio
+  3: '#9900ff', // copyright
+  4: '#00ab2c', // character
+  5: '#ed5d1f', // species
+  6: '#8a66ff', // genre
+  7: '#00cccc', // medium
+  8: '#6b7280', // meta
+  9: '#228b22', // lore
+  10: '#e67e22', // lens
+  11: '#f1c40f', // lighting
+  12: '#1abc9c', // composition
+  13: '#e84393', // color
+};
+
+// -- Utilities (ported from Enso) --
+
+/** Binary search for the first tag where tag.name >= prefix. */
+function lowerBound(tags, prefix) {
+  let lo = 0;
+  let hi = tags.length;
+  while (lo < hi) {
+    const mid = (lo + hi) >>> 1;
+    if (tags[mid].name < prefix) lo = mid + 1;
+    else hi = mid;
+  }
+  return lo;
+}
+
+/** Format post count as abbreviated string. */
+function formatCount(count) {
+  if (count >= 1_000_000) return `${(count / 1_000_000).toFixed(1)}M`;
+  if (count >= 1_000) return `${Math.round(count / 1_000)}k`;
+  return String(count);
+}
+
+// -- TagIndex --
+
+class TagIndex {
+  constructor(data) {
+    this.categories = data.categories || {};
+    // Build sorted array of {name, category, count} from raw [name, catId, count] tuples
+    this.tags = data.tags.map(([name, category, count]) => ({
+      name: name.toLowerCase(),
+      display: name,
+      category,
+      count,
+    }));
+    this.tags.sort((a, b) => a.name.localeCompare(b.name));
+  }
+
+  /** Prefix search with binary search. Returns matches sorted by count descending. */
+  search(prefix, limit = 20) {
+    const query = prefix.toLowerCase().replace(/ /g, '_');
+    if (!query) return [];
+    const start = lowerBound(this.tags, query);
+    const matches = [];
+    for (let i = start; i < this.tags.length && matches.length < limit * 5; i++) {
+      if (!this.tags[i].name.startsWith(query)) break;
+      matches.push(this.tags[i]);
+    }
+    // Substring fallback for 4+ chars if prefix found nothing
+    if (matches.length === 0 && query.length >= 4) {
+      for (let i = 0; i < this.tags.length && matches.length < limit * 5; i++) {
+        if (this.tags[i].name.includes(query)) matches.push(this.tags[i]);
+      }
+    }
+    matches.sort((a, b) => b.count - a.count);
+    return matches.slice(0, limit);
+  }
+}
+
+// -- Engine --
+
+const engine = {
+  indices: new Map(), // name -> TagIndex
+  categoryColors: { ...CATEGORY_COLORS },
+
+  async loadEnabled() {
+    const enabled = window.opts?.autocomplete_enabled || [];
+    if (!enabled.length) {
+      this.indices.clear();
+      return;
+    }
+    const toLoad = enabled.filter((n) => !this.indices.has(n));
+    const toRemove = [...this.indices.keys()].filter((n) => !enabled.includes(n));
+    toRemove.forEach((n) => this.indices.delete(n));
+    await Promise.all(toLoad.map(async (name) => {
+      try {
+        const resp = await fetch(`${window.api}/autocomplete/${name}`, { credentials: 'include' });
+        if (!resp.ok) throw new Error(`${resp.status}`);
+        const data = await resp.json();
+        this.indices.set(name, new TagIndex(data));
+        // Extract category colors from first loaded file
+        if (data.categories) {
+          Object.entries(data.categories).forEach(([id, cat]) => {
+            if (cat.color) this.categoryColors[id] = cat.color;
+          });
+        }
+        log('autocomplete', `loaded ${name}: ${data.tags?.length || 0} tags`);
+      } catch (e) {
+        log('autocomplete', `failed to load ${name}: ${e}`);
+      }
+    }));
+  },
+
+  searchAll(prefix, limit = 20) {
+    if (this.indices.size === 0) return [];
+    const all = [];
+    this.indices.forEach((index) => {
+      all.push(...index.search(prefix, limit));
+    });
+    // Deduplicate by name, keeping highest count
+    const seen = new Map();
+    all.forEach((tag) => {
+      const existing = seen.get(tag.name);
+      if (!existing || tag.count > existing.count) seen.set(tag.name, tag);
+    });
+    const results = [...seen.values()];
+    results.sort((a, b) => b.count - a.count);
+    return results.slice(0, limit);
+  },
+};
+
+// -- Textarea integration --
+
+/** Extract the current word being typed at the cursor position. */
+function getCurrentWord(textarea) {
+  const { value, selectionStart } = textarea;
+  if (selectionStart !== textarea.selectionEnd) return null; // has selection
+  // Scan backward from cursor to find word start
+  let start = selectionStart;
+  while (start > 0) {
+    const ch = value[start - 1];
+    if (ch === ',' || ch === '\n') break;
+    start--;
+  }
+  // Skip leading whitespace
+  while (start < selectionStart && value[start] === ' ') start++;
+  const word = value.slice(start, selectionStart);
+  if (!word) return null;
+  // Skip if inside angle brackets (LoRA/embedding syntax)
+  const before = value.slice(0, selectionStart);
+  const lastOpen = before.lastIndexOf('<');
+  const lastClose = before.lastIndexOf('>');
+  if (lastOpen > lastClose) return null;
+  // Skip if inside wildcard syntax
+  const wcBefore = before.slice(start);
+  if (wcBefore.startsWith('__') && !wcBefore.endsWith('__')) return null;
+  return { word, start, end: selectionStart };
+}
+
+/** Insert a tag at the current word position, replacing the typed prefix. */
+function insertTag(textarea, tagName) {
+  const info = getCurrentWord(textarea);
+  if (!info) return;
+  const { value } = textarea;
+  const before = value.slice(0, info.start);
+  const after = value.slice(info.end);
+  // Build insertion: tag + separator
+  const needsCommaBefore = before.length > 0 && !before.trimEnd().endsWith(',') && before.trimEnd().length > 0;
+  const prefix = needsCommaBefore ? ', ' : '';
+  let suffix = ', ';
+  if (after.length > 0 && after.trimStart().startsWith(',')) suffix = ' ';
+  const insertion = `${prefix}${tagName}${suffix}`;
+  textarea.value = before.trimEnd() + (before.trimEnd().length > 0 ? ' ' : '') + insertion + after.trimStart();
+  // Position cursor after the inserted tag + separator
+  const cursorPos = before.trimEnd().length + (before.trimEnd().length > 0 ? 1 : 0) + insertion.length;
+  textarea.selectionStart = cursorPos;
+  textarea.selectionEnd = cursorPos;
+  // Sync with Gradio
+  if (typeof updateInput === 'function') updateInput(textarea);
+}
+
+// -- Dropdown --
+
+const dropdown = {
+  el: null,
+  listEl: null,
+  selectedIndex: -1,
+  results: [],
+  textarea: null,
+  visible: false,
+
+  init() {
+    this.el = document.createElement('div');
+    this.el.className = 'autocompleteResults';
+    this.el.style.display = 'none';
+    this.listEl = document.createElement('ul');
+    this.listEl.className = 'autocompleteResultsList';
+    this.el.appendChild(this.listEl);
+    document.body.appendChild(this.el);
+    this.el.addEventListener('mousedown', (e) => e.preventDefault()); // prevent blur on click
+    this.el.addEventListener('click', (e) => {
+      const li = e.target.closest('li');
+      if (!li) return;
+      const idx = [...this.listEl.children].indexOf(li);
+      if (idx >= 0 && idx < this.results.length) {
+        this.selectedIndex = idx;
+        this.accept();
+      }
+    });
+  },
+
+  show(results, textarea) {
+    if (results.length === 0) { this.hide(); return; }
+    this.results = results;
+    this.textarea = textarea;
+    this.selectedIndex = -1;
+    this.render();
+    this.position();
+    this.el.style.display = '';
+    this.visible = true;
+  },
+
+  hide() {
+    this.el.style.display = 'none';
+    this.visible = false;
+    this.results = [];
+    this.selectedIndex = -1;
+  },
+
+  render() {
+    const replaceUnderscores = window.opts?.autocomplete_replace_underscores ?? true;
+    this.listEl.innerHTML = '';
+    this.results.forEach((tag, i) => {
+      const li = document.createElement('li');
+      if (i === this.selectedIndex) li.classList.add('selected');
+      const dot = document.createElement('span');
+      dot.className = 'autocomplete-category';
+      dot.style.color = engine.categoryColors[tag.category] || '#888';
+      dot.textContent = '\u25CF';
+      const name = document.createElement('span');
+      name.className = 'autocomplete-tag';
+      name.textContent = replaceUnderscores ? tag.display.replace(/_/g, ' ') : tag.display;
+      const count = document.createElement('span');
+      count.className = 'autocomplete-count';
+      count.textContent = tag.count > 0 ? formatCount(tag.count) : '';
+      li.append(dot, name, count);
+      li.addEventListener('mouseenter', () => {
+        this.selectedIndex = i;
+        this.updateSelection();
+      });
+      this.listEl.appendChild(li);
+    });
+  },
+
+  position() {
+    if (!this.textarea) return;
+    const rect = this.textarea.getBoundingClientRect();
+    const spaceBelow = window.innerHeight - rect.bottom;
+    const dropHeight = Math.min(this.el.scrollHeight, 300);
+    if (spaceBelow >= dropHeight || spaceBelow >= rect.top) {
+      this.el.style.top = `${rect.bottom + 2}px`;
+    } else {
+      this.el.style.top = `${rect.top - dropHeight - 2}px`;
+    }
+    this.el.style.left = `${rect.left}px`;
+    this.el.style.width = `${rect.width}px`;
+  },
+
+  updateSelection() {
+    [...this.listEl.children].forEach((li, i) => {
+      li.classList.toggle('selected', i === this.selectedIndex);
+    });
+    const selected = this.listEl.children[this.selectedIndex];
+    if (selected) selected.scrollIntoView({ block: 'nearest' });
+  },
+
+  navigate(dir) {
+    if (this.results.length === 0) return;
+    if (this.selectedIndex === -1) {
+      this.selectedIndex = dir > 0 ? 0 : this.results.length - 1;
+    } else {
+      this.selectedIndex = (this.selectedIndex + dir + this.results.length) % this.results.length;
+    }
+    this.updateSelection();
+  },
+
+  accept() {
+    if (this.selectedIndex < 0 || this.selectedIndex >= this.results.length) {
+      // Tab with no selection: select first
+      if (this.results.length > 0) {
+        this.selectedIndex = 0;
+        this.updateSelection();
+      }
+      return;
+    }
+    const tag = this.results[this.selectedIndex];
+    if (this.textarea) insertTag(this.textarea, tag.display);
+    this.hide();
+  },
+};
+
+// -- Event handlers --
+
+let debounceTimer = null;
+
+function onInput(textarea) {
+  const minChars = window.opts?.autocomplete_min_chars ?? 3;
+  const info = getCurrentWord(textarea);
+  if (!info || info.word.length < minChars) {
+    dropdown.hide();
+    return;
+  }
+  clearTimeout(debounceTimer);
+  debounceTimer = setTimeout(() => {
+    const results = engine.searchAll(info.word);
+    dropdown.show(results, textarea);
+  }, 150);
+}
+
+function onKeyDown(e) {
+  if (!dropdown.visible) return;
+  switch (e.key) {
+    case 'ArrowDown':
+      e.preventDefault();
+      e.stopPropagation();
+      dropdown.navigate(1);
+      break;
+    case 'ArrowUp':
+      e.preventDefault();
+      e.stopPropagation();
+      dropdown.navigate(-1);
+      break;
+    case 'Enter':
+      if (dropdown.selectedIndex >= 0) {
+        e.preventDefault();
+        e.stopPropagation();
+        dropdown.accept();
+      }
+      break;
+    case 'Tab':
+      e.preventDefault();
+      e.stopPropagation();
+      dropdown.accept();
+      break;
+    case 'Escape':
+      e.preventDefault();
+      e.stopPropagation();
+      dropdown.hide();
+      break;
+    default:
+      break;
+  }
+}
+
+/** Attach autocomplete to a single textarea. */
+function attachAutocomplete(textarea) {
+  textarea.addEventListener('input', () => onInput(textarea));
+  textarea.addEventListener('keydown', onKeyDown);
+  textarea.addEventListener('focusout', () => {
+    setTimeout(() => dropdown.hide(), 200);
+  });
+}
+
+// -- Prompt textarea IDs --
+
+const PROMPT_IDS = [
+  'txt2img_prompt', 'txt2img_neg_prompt',
+  'img2img_prompt', 'img2img_neg_prompt',
+  'control_prompt', 'control_neg_prompt',
+  'video_prompt', 'video_neg_prompt',
+];
+
+// -- Initialization --
+
+async function initAutocomplete() {
+  const enabled = window.opts?.autocomplete_enabled || [];
+  if (!enabled.length) {
+    log('autocomplete', 'no dictionaries enabled');
+    return;
+  }
+  log('autocomplete', `init: ${enabled.join(', ')}`);
+  // Inject styles (CSS files in javascript/ are not auto-loaded)
+  const style = document.createElement('style');
+  style.textContent = [
+    '.autocompleteResults { position: fixed; z-index: 9999; max-height: 300px; overflow-y: auto;',
+    '  background: var(--sd-main-background-color, var(--background-fill-primary, #1f2937));',
+    '  border: 1px solid var(--sd-input-border-color, var(--border-color-primary, #374151));',
+    '  border-radius: var(--sd-border-radius, 6px); box-shadow: 0 4px 12px rgba(0,0,0,0.3);',
+    '  font-size: 13px; scrollbar-width: thin; }',
+    '.autocompleteResultsList { list-style: none; margin: 0; padding: 4px 0; }',
+    '.autocompleteResultsList > li { display: flex; align-items: center; padding: 4px 10px; cursor: pointer; gap: 8px; line-height: 1.4; }',
+    '.autocompleteResultsList > li:hover { background: var(--sd-panel-background-color, var(--input-background-fill-focus, #374151)); }',
+    '.autocompleteResultsList > li.selected { background: var(--sd-main-accent-color, var(--button-primary-background-fill, #4b5563)); }',
+    '.autocomplete-category { font-size: 10px; flex-shrink: 0; width: 10px; text-align: center; }',
+    '.autocomplete-tag { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }',
+    '.autocomplete-count { font-size: 0.8em; opacity: 0.5; flex-shrink: 0; font-variant-numeric: tabular-nums; }',
+  ].join('\n');
+  document.head.appendChild(style);
+  dropdown.init();
+  await engine.loadEnabled();
+  if (engine.indices.size === 0) {
+    log('autocomplete', 'no dictionaries loaded');
+    return;
+  }
+  // Attach to all prompt textareas
+  let attached = 0;
+  PROMPT_IDS.forEach((id) => {
+    const textarea = gradioApp().querySelector(`#${id} > label > textarea`);
+    if (textarea) {
+      attachAutocomplete(textarea);
+      attached++;
+    }
+  });
+  log('autocomplete', `attached to ${attached} textareas, ${engine.indices.size} dictionaries`);
+  // Reload when settings change
+  onOptionsChanged(async () => {
+    const newEnabled = window.opts?.autocomplete_enabled || [];
+    const currentKeys = [...engine.indices.keys()].sort().join(',');
+    const newKeys = [...newEnabled].sort().join(',');
+    if (currentKeys !== newKeys) {
+      log('autocomplete', `reloading: ${newEnabled.join(', ')}`);
+      await engine.loadEnabled();
+    }
+  });
+}
diff --git a/javascript/startup.js b/javascript/startup.js
index 5f6b3f926..a51a0272d 100644
--- a/javascript/startup.js
+++ b/javascript/startup.js
@@ -59,6 +59,7 @@ async function initStartup() {
 
   // optinally wait for modern ui
   if (window.waitForUiReady) await waitForUiReady();
+  initAutocomplete();
   monitorConnection();
   removeSplash();
 
diff --git a/modules/api/api.py b/modules/api/api.py
index 9e98be0bf..889ba6104 100644
--- a/modules/api/api.py
+++ b/modules/api/api.py
@@ -145,9 +145,9 @@ class Api:
 
         # hide trailing-slash duplicates from OpenAPI schema
         from fastapi.routing import APIRoute
-        paths = {r.path for r in self.app.routes if hasattr(r, 'path')}
+        route_paths = {r.path for r in self.app.routes if hasattr(r, 'path')}
         for route in self.app.routes:
-            if isinstance(route, APIRoute) and len(route.path) > 1 and route.path.endswith('/') and route.path[:-1] in paths:
+            if isinstance(route, APIRoute) and len(route.path) > 1 and route.path.endswith('/') and route.path[:-1] in route_paths:
                 route.include_in_schema = False
 
         # upload api
diff --git a/modules/api/autocomplete.py b/modules/api/autocomplete.py
index a8dad5f92..cb90baee6 100644
--- a/modules/api/autocomplete.py
+++ b/modules/api/autocomplete.py
@@ -25,7 +25,7 @@ manifest_cache: dict = {}  # {"data": [...], "fetched_at": float}
 
 def init(path: str) -> None:
     """Set the autocomplete directory path. Called once during API registration."""
-    global autocomplete_dir  # noqa: PLW0603
+    global autocomplete_dir # pylint: disable=global-statement
     autocomplete_dir = path
 
 
@@ -36,7 +36,18 @@ def get_cached(name: str) -> dict:
     path = os.path.join(autocomplete_dir, f"{name}.json")
     if not os.path.isfile(path):
         cache.pop(name, None)
-        raise HTTPException(status_code=404, detail=f"Not found: {name}")
+        # Auto-download from HF if available in manifest
+        try:
+            manifest = fetch_manifest_sync()
+            if any(e.get('name') == name for e in manifest):
+                log.info(f"Auto-downloading autocomplete: {name}")
+                download_sync(name)
+            else:
+                raise HTTPException(status_code=404, detail=f"Not found: {name}")
+        except HTTPException:
+            raise
+        except Exception as e:
+            raise HTTPException(status_code=404, detail=f"Not found: {name} ({e})") from e
     stat = os.stat(path)
     entry = cache.get(name)
     if entry and entry['mtime'] == stat.st_mtime:
@@ -109,7 +120,7 @@ async def get_content(name: str) -> ItemAutocompleteContent:
     )
 
 
-# ── Remote management ──
+# -- Remote management --
 
 def fetch_manifest_sync() -> list[dict]:
     """Fetch manifest.json from HuggingFace, with caching."""
@@ -212,7 +223,7 @@ def download_sync(name: str) -> str:
 
 async def download(name: str):
     """Download a tag file from HuggingFace."""
-    path = await asyncio.to_thread(download_sync, name)
+    await asyncio.to_thread(download_sync, name)
     entry = await asyncio.to_thread(get_cached, name)
     meta = entry['meta']
     return ItemAutocomplete(
diff --git a/modules/ui_definitions.py b/modules/ui_definitions.py
index bc2cd3851..f563edd69 100644
--- a/modules/ui_definitions.py
+++ b/modules/ui_definitions.py
@@ -52,16 +52,25 @@ def get_openvino_device_list():
 
 
 def list_autocomplete_names():
-    """Return list of available tag autocomplete file names (JSON filenames without extension)."""
+    """Return list of available tag autocomplete file names from local files and HF manifest."""
     from modules import shared, paths as paths_module
+    names = set()
+    # Local files
     autocomplete_dir = getattr(shared.opts, 'autocomplete_dir', None) or os.path.join(paths_module.models_path, 'autocomplete')
-    if not os.path.isdir(autocomplete_dir):
-        return []
-    return sorted(
-        os.path.splitext(f)[0]
-        for f in os.listdir(autocomplete_dir)
-        if f.endswith('.json') and not f.startswith('.') and f != 'manifest.json'
-    )
+    if os.path.isdir(autocomplete_dir):
+        for f in os.listdir(autocomplete_dir):
+            if f.endswith('.json') and not f.startswith('.') and f != 'manifest.json':
+                names.add(os.path.splitext(f)[0])
+    # Remote manifest
+    try:
+        from modules.api.autocomplete import fetch_manifest_sync
+        for entry in fetch_manifest_sync():
+            names.add(entry.get('name', ''))
+    except Exception as e:
+        from modules.logger import log
+        log.debug(f"Autocomplete manifest fetch skipped: {e}")
+    names.discard('')
+    return sorted(names)
 
 
 def create_settings(cmd_opts):
@@ -653,7 +662,9 @@ def create_settings(cmd_opts):
         "wildcards_enabled": OptionInfo(True, "Enable file wildcards support"),
 
         "extra_networks_autocomplete_sep": OptionInfo("<h2>Tag Autocomplete</h2>", "", gr.HTML),
-        "autocomplete_enabled": OptionInfo([], "Enabled tag autocomplete files", gr.CheckboxGroup, lambda: {"choices": list_autocomplete_names()}),
+        "autocomplete_enabled": OptionInfo([], "Enabled tag autocomplete files", gr.Dropdown, lambda: {"multiselect": True, "choices": list_autocomplete_names()}),
+        "autocomplete_min_chars": OptionInfo(3, "Minimum characters before autocomplete triggers", gr.Slider, {"minimum": 2, "maximum": 6, "step": 1}),
+        "autocomplete_replace_underscores": OptionInfo(True, "Replace underscores with spaces in autocomplete results"),
     }))
 
     # --- Extensions ---