diff --git a/ui/builder.html b/ui/builder.html
index 48fadbe..8440a25 100644
--- a/ui/builder.html
+++ b/ui/builder.html
@@ -157,6 +157,30 @@ body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;backgrou
 .grp-names:focus{outline:none;border-color:var(--border-focus)}
 .grp-hint{font-size:10px;color:var(--muted);margin-top:3px}
 
+/* ── 그룹 옵션 (구분자 / 한 줄) ─────────────────────────── */
+.grp-opts{display:flex;flex-direction:column;gap:5px;margin-top:6px;padding-top:6px;border-top:1px dashed var(--border)}
+.opt-row{display:flex;align-items:center;gap:6px}
+.opt-lbl{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);width:40px;flex-shrink:0}
+.sep-chips{display:flex;gap:3px;flex-wrap:wrap}
+.sep-chip{
+  font-size:11px;padding:2px 8px;border-radius:4px;border:1px solid var(--border);
+  background:var(--surface);color:var(--muted);cursor:pointer;font-weight:500;
+  transition:all .1s;white-space:nowrap
+}
+.sep-chip:hover{border-color:var(--accent);color:var(--accent)}
+.sep-chip.on{background:var(--accent);color:#fff;border-color:var(--accent)}
+.sep-custom{
+  width:52px;font-size:11px;border:1px solid var(--border);border-radius:4px;
+  padding:2px 5px;background:var(--surface);text-align:center
+}
+.sep-custom:focus{outline:none;border-color:var(--border-focus)}
+.npl-input{
+  width:46px;font-size:12px;border:1px solid var(--border);border-radius:4px;
+  padding:2px 5px;text-align:center;background:var(--surface)
+}
+.npl-input:focus{outline:none;border-color:var(--border-focus)}
+.npl-input:disabled{background:var(--surface-alt);color:var(--muted)}
+
 /* ── 섹션 하단 액션 ──────────────────────────────────────── */
 .sec-actions{display:flex;gap:5px;flex-wrap:wrap;padding-top:2px}
 .sBtn{
@@ -266,13 +290,6 @@ input,textarea,button{font-family:inherit}
           <div class="marks-wrap" id="marksList"></div>
           <button class="btn-add-mark" onclick="addMark()">+ 레벨</button>
         </div>
-        <div class="config-row">
-          <span class="config-lbl">한 줄</span>
-          <input id="cfgNpl" type="number" min="0" step="1"
-            style="width:56px;text-align:center;font-size:13px;border:1px solid var(--border);border-radius:6px;padding:3px 6px;background:var(--surface)"
-            value="0" oninput="syncConfig()">
-          <span style="font-size:12px;color:var(--muted)">개&nbsp;&nbsp;<span style="font-size:11px">(0 = 제한 없음)</span></span>
-        </div>
       </div>
 
       <!-- 문서 제목 -->
@@ -325,16 +342,19 @@ input,textarea,button{font-family:inherit}
 // ════════════════════════════════════════════════════════════
 // 상태
 // ════════════════════════════════════════════════════════════
+function mkGrp(cat='',names='',sep=' ',npl=0){
+  return {id:id(),cat,names,sep,namesPerLine:npl};
+}
 let S = {
-  cfg: { titleMark:'✅', marks:['🔹','🔸'], namesPerLine:0 },
+  cfg: { titleMark:'✅', marks:['🔹','🔸'] },
   title: '예시 양식',
   sections: [
     { id:id(), lv:1, name:'1번 항목',
-      groups:[{id:id(),cat:'',names:'홍길동 홍길순 홍길영 홍길준\n홍길호 홍길윤'}],
+      groups:[mkGrp('','홍길동 홍길순 홍길영 홍길준\n홍길호 홍길윤')],
       children:[] },
     { id:id(), lv:1, name:'2번 항목', groups:[], children:[
-      { id:id(), lv:2, name:'2-1 항목', groups:[{id:id(),cat:'건강',names:'홍길찬 홍길만'}], children:[] },
-      { id:id(), lv:2, name:'2-2 항목', groups:[{id:id(),cat:'직장',names:'홍길주'}],       children:[] }
+      { id:id(), lv:2, name:'2-1 항목', groups:[mkGrp('건강','홍길찬 홍길만')], children:[] },
+      { id:id(), lv:2, name:'2-2 항목', groups:[mkGrp('직장','홍길주')],        children:[] }
     ]}
   ]
 };
@@ -358,8 +378,7 @@ function load(){
 // 설정
 // ════════════════════════════════════════════════════════════
 function syncConfig(){
-  S.cfg.titleMark    = document.getElementById('cfgTitle').value || '✅';
-  S.cfg.namesPerLine = Math.max(0, parseInt(document.getElementById('cfgNpl').value)||0);
+  S.cfg.titleMark = document.getElementById('cfgTitle').value || '✅';
   document.getElementById('titleMarkBadge').textContent = S.cfg.titleMark;
   renderMarks();
   renderSections();
@@ -438,7 +457,7 @@ function updateName(id,v){ const s=findSec(S.sections,id); if(s) s.name=v; updat
 // ════════════════════════════════════════════════════════════
 function addGroup(sid){
   const s=findSec(S.sections,sid); if(!s) return;
-  const ng={id:id(),cat:'',names:''};
+  const ng=mkGrp();
   s.groups.push(ng);
   renderSections();
   updatePreview();
@@ -476,7 +495,23 @@ function renderSec(sec, idx, totalInParent){
   const maxLv = S.cfg.marks.length;
   const canChild = sec.lv < maxLv;
 
-  const grpsHtml = sec.groups.map((g,gi)=>`
+  const SEP_PRESETS=[
+    {v:' ',  label:'공백'},
+    {v:', ', label:', '},
+    {v:' / ',label:'/'},
+    {v:'\n', label:'↵ 줄바꿈'},
+  ];
+  const grpsHtml = sec.groups.map((g,gi)=>{
+    const sep  = g.sep ?? ' ';
+    const npl  = g.namesPerLine ?? 0;
+    const isNl = sep==='\n';
+    const presetMatch = SEP_PRESETS.find(p=>p.v===sep);
+    const sepChips = SEP_PRESETS.map(p=>`
+      <span class="sep-chip${sep===p.v?' on':''}"
+        onclick="updateGroup('${sec.id}','${g.id}','sep',${JSON.stringify(p.v)});renderSections();updatePreview();save()"
+      >${p.label}</span>`).join('');
+    const customVal = presetMatch ? '' : esc(sep);
+    return `
     <div class="grp" data-gid="${g.id}">
       <div class="grp-head">
         <span class="grp-cat-lbl">카테고리</span>
@@ -488,10 +523,27 @@ function renderSec(sec, idx, totalInParent){
         <button class="iBtn"    onclick="deleteGroup('${sec.id}','${g.id}')"  title="삭제">✕</button>
       </div>
       <textarea class="grp-names"
-        placeholder="이름 입력 (공백/줄바꿈으로 구분)"
+        placeholder="이름 입력 (공백·줄바꿈·쉼표로 구분)"
         oninput="updateGroup('${sec.id}','${g.id}','names',this.value)">${esc(g.names)}</textarea>
-      <div class="grp-hint">스페이스·줄바꿈·쉼표로 이름을 구분합니다</div>
-    </div>`).join('');
+      <div class="grp-opts">
+        <div class="opt-row">
+          <span class="opt-lbl">구분자</span>
+          <div class="sep-chips">${sepChips}</div>
+          <input class="sep-custom" placeholder="직접"
+            value="${customVal}"
+            title="직접 입력 시 엔터(\\n)도 사용 가능"
+            oninput="updateGroup('${sec.id}','${g.id}','sep',this.value||' ');updatePreview();save()">
+        </div>
+        <div class="opt-row">
+          <span class="opt-lbl">한 줄</span>
+          <input class="npl-input" type="number" min="0" step="1"
+            value="${npl}" ${isNl?'disabled title="줄바꿈 모드에서는 자동 1개"':''}
+            oninput="updateGroup('${sec.id}','${g.id}','namesPerLine',Math.max(0,+this.value||0));updatePreview();save()">
+          <span style="font-size:11px;color:var(--muted)">${isNl?'(줄바꿈 모드)':'개 &nbsp;(0 = 제한없음)'}</span>
+        </div>
+      </div>
+    </div>`;
+  }).join('');
 
   const childrenHtml = sec.children.map((c,ci)=>renderSec(c,ci,sec.children.length)).join('');
 
@@ -521,7 +573,6 @@ function renderSections(){
   renderMarks();
   document.getElementById('titleMarkBadge').textContent = S.cfg.titleMark;
   document.getElementById('cfgTitle').value  = S.cfg.titleMark;
-  document.getElementById('cfgNpl').value    = S.cfg.namesPerLine ?? 0;
   document.getElementById('docTitle').value  = S.title;
   document.getElementById('secList').innerHTML = S.sections.map((s,i)=>renderSec(s,i,S.sections.length)).join('');
 }
@@ -545,13 +596,16 @@ function toText(){
     for(const g of sec.groups){
       const ns=parseNames(g.names);
       if(!ns.length) continue;
-      const pre=g.cat.trim()?`(${g.cat.trim()}) `:'';
-      const npl=S.cfg.namesPerLine;
-      if(npl>0){
+      const pre = g.cat.trim()?`(${g.cat.trim()}) `:'';
+      const sep = g.sep??' ';
+      const npl = g.namesPerLine??0;
+      if(sep==='\n'){
+        ns.forEach((n,i)=>lines.push((i===0?pre:'')+n));
+      } else if(npl>0){
         for(let i=0;i<ns.length;i+=npl)
-          lines.push((i===0?pre:'')+ns.slice(i,i+npl).join(' '));
+          lines.push((i===0?pre:'')+ns.slice(i,i+npl).join(sep));
       } else {
-        lines.push(pre+ns.join(' '));
+        lines.push(pre+ns.join(sep));
       }
       lines.push('');
     }
@@ -687,7 +741,7 @@ function doImport(){
   function flush(){
     if(!pend||!pend.names.length){ pend=null; return; }
     const parent = pend.parentId ? findSec(sections, pend.parentId) : null;
-    const grp={id:id(),cat:pend.cat||'',names:pend.names.join(' ')};
+    const grp=mkGrp(pend.cat||'',pend.names.join(' '));
     if(parent) parent.groups.push(grp);
     pend=null;
   }