diff --git a/src/app/components/Editor.tsx b/src/app/components/Editor.tsx
index 2439750..72a5146 100644
--- a/src/app/components/Editor.tsx
+++ b/src/app/components/Editor.tsx
@@ -1,18 +1,112 @@
 "use client";
-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useCallback } from "react";
+import { useToast } from "@/app/components/ui/ToastProvider";
 
-export function Editor({ value, onChange, placeholder }: { value: string; onChange: (v: string) => void; placeholder?: string }) {
+type Props = { value: string; onChange: (v: string) => void; placeholder?: string };
+
+async function readFileAsDataUrl(file: File): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = () => resolve(String(reader.result));
+    reader.onerror = reject;
+    reader.readAsDataURL(file);
+  });
+}
+
+async function resizeImageToBlob(dataUrl: string, opts: { maxWidth: number; maxHeight: number; quality: number }): Promise<Blob> {
+  const img = document.createElement("img");
+  img.decoding = "async";
+  img.loading = "eager";
+  img.src = dataUrl;
+  await new Promise((res, rej) => {
+    img.onload = () => res(null);
+    img.onerror = rej;
+  });
+  const w = img.naturalWidth || 1;
+  const h = img.naturalHeight || 1;
+  const scale = Math.min(1, opts.maxWidth / w || 1, opts.maxHeight / h || 1);
+  const targetW = Math.max(1, Math.round(w * scale));
+  const targetH = Math.max(1, Math.round(h * scale));
+  const canvas = document.createElement("canvas");
+  canvas.width = targetW;
+  canvas.height = targetH;
+  const ctx = canvas.getContext("2d");
+  if (!ctx) throw new Error("Canvas unsupported");
+  ctx.drawImage(img, 0, 0, targetW, targetH);
+  return await new Promise((resolve) => canvas.toBlob((b) => resolve(b as Blob), "image/webp", opts.quality));
+}
+
+export function Editor({ value, onChange, placeholder }: Props) {
   const ref = useRef<HTMLDivElement | null>(null);
+  const { show } = useToast();
+
   useEffect(() => {
     const el = ref.current;
     if (!el) return;
     if (el.innerHTML !== value) el.innerHTML = value || "";
   }, [value]);
+
+  const insertHtmlAtCursor = useCallback((html: string) => {
+    // eslint-disable-next-line deprecation/deprecation
+    document.execCommand("insertHTML", false, html);
+  }, []);
+
+  const uploadAndInsert = useCallback(
+    async (files: File[]) => {
+      const images = files.filter((f) => f.type.startsWith("image/"));
+      if (images.length === 0) return;
+      for (const f of images) {
+        try {
+          const dataUrl = await readFileAsDataUrl(f);
+          const blob = await resizeImageToBlob(dataUrl, { maxWidth: 1600, maxHeight: 1600, quality: 0.9 });
+          const fd = new FormData();
+          fd.append("file", new File([blob], `${Date.now()}.webp`, { type: "image/webp" }));
+          const r = await fetch("/api/uploads", { method: "POST", body: fd });
+          const data = await r.json();
+          if (!r.ok) throw new Error(JSON.stringify(data));
+          const alt = window.prompt("이미지 대체텍스트(ALT)를 입력하세요.") || "";
+          const caption = window.prompt("이미지 캡션(선택)") || "";
+          const figure = `<figure style="margin:8px 0"><img src="${data.url}" alt="${alt.replace(/"/g, '&quot;')}" /><figcaption style="font-size:12px;opacity:.8">${caption.replace(/</g, "&lt;")}</figcaption></figure>`;
+          insertHtmlAtCursor(figure);
+          // onChange 동기화
+          const el = ref.current;
+          if (el) onChange(el.innerHTML);
+        } catch {
+          show("이미지 업로드 실패");
+        }
+      }
+    },
+    [insertHtmlAtCursor, onChange, show]
+  );
+
+  const onPaste = useCallback(
+    async (e: React.ClipboardEvent<HTMLDivElement>) => {
+      const files = Array.from(e.clipboardData?.files ?? []);
+      if (files.some((f) => f.type.startsWith("image/"))) {
+        e.preventDefault();
+        await uploadAndInsert(files);
+      }
+    },
+    [uploadAndInsert]
+  );
+
+  const onDrop = useCallback(
+    async (e: React.DragEvent<HTMLDivElement>) => {
+      e.preventDefault();
+      const files = Array.from(e.dataTransfer?.files ?? []);
+      if (files.length > 0) await uploadAndInsert(files);
+    },
+    [uploadAndInsert]
+  );
+
   return (
     <div
       ref={ref}
       contentEditable
       onInput={(e) => onChange((e.target as HTMLDivElement).innerHTML)}
+      onPaste={onPaste}
+      onDrop={onDrop}
+      onDragOver={(e) => e.preventDefault()}
       data-placeholder={placeholder}
       style={{
         minHeight: 160,
diff --git a/todolist.txt b/todolist.txt
index f0f84e6..05e0a7a 100644
--- a/todolist.txt
+++ b/todolist.txt
@@ -65,7 +65,7 @@
 9.1 에디터(Tiptap/Quill 중 택1) 통합 o
 9.2 이미지/파일 업로드 서버 처리 및 검증 o
 9.3 리사이즈/웹포맷 최적화 및 용량 제한 o
-9.4 붙여넣기/드래그 삽입, 캡션/대체텍스트
+9.4 붙여넣기/드래그 삽입, 캡션/대체텍스트 o
 9.5 사진 중심 카테고리 프리셋(해상도/비율/워터마크 옵션)
 
 [관리자(Admin)]