diff --git a/alembic/versions/0007_attachments.py b/alembic/versions/0007_attachments.py
new file mode 100644
index 0000000..f4fa01e
--- /dev/null
+++ b/alembic/versions/0007_attachments.py
@@ -0,0 +1,32 @@
+"""note_attachments
+
+Revision ID: 0007
+Revises: 0006
+Create Date: 2026-07-20
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID
+
+revision = "0007"
+down_revision = "0006"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "note_attachments",
+        sa.Column("id", UUID(as_uuid=True), primary_key=True),
+        sa.Column("note_id", UUID(as_uuid=True), sa.ForeignKey("notes.id", ondelete="CASCADE"), nullable=False),
+        sa.Column("path", sa.Text(), nullable=False),
+        sa.Column("mime", sa.Text(), nullable=False),
+        sa.Column("size", sa.BigInteger(), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+    )
+    op.create_index("ix_note_attachments_note", "note_attachments", ["note_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_note_attachments_note", table_name="note_attachments")
+    op.drop_table("note_attachments")
diff --git a/frontend/src/components/Icon.vue b/frontend/src/components/Icon.vue
index d2fb296..70778fa 100644
--- a/frontend/src/components/Icon.vue
+++ b/frontend/src/components/Icon.vue
@@ -15,6 +15,7 @@ const paths: Record<string, string> = {
   plus: '<path d="M5 12h14"/><path d="M12 5v14"/>',
   check: '<path d="M20 6 9 17l-5-5"/>',
   checkbox: '<rect width="18" height="18" x="3" y="3" rx="2"/><path d="m9 12 2 2 4-4"/>',
+  image: '<rect width="18" height="18" x="3" y="3" rx="2"/><circle cx="9" cy="9" r="2"/><path d="m21 15-3.086-3.086a2 2 0 0 0-2.828 0L6 21"/>',
 };
 </script>
 
diff --git a/frontend/src/components/NoteCard.vue b/frontend/src/components/NoteCard.vue
index a2f9b9f..d0f1b5f 100644
--- a/frontend/src/components/NoteCard.vue
+++ b/frontend/src/components/NoteCard.vue
@@ -19,6 +19,14 @@ function cardClass(color: NoteColor): string {
     class="group relative mb-4 break-inside-avoid rounded-xl border p-3 shadow-sm transition hover:shadow-md"
     :class="cardClass(note.color)"
   >
+    <img
+      v-if="note.attachments.length"
+      :src="note.attachments[0].url"
+      alt=""
+      class="mb-2 max-h-48 w-full cursor-pointer rounded-lg object-cover"
+      @click="emit('open', note)"
+    />
+
     <!-- Checklist notes can't nest interactive controls in a <button>, so use a
          focusable div; text notes keep a semantic button. -->
     <template v-if="note.kind === 'list'">
@@ -48,7 +56,9 @@ function cardClass(color: NoteColor): string {
       <p v-if="note.body" class="whitespace-pre-wrap break-words text-sm text-neutral-700 dark:text-neutral-300">
         {{ note.body }}
       </p>
-      <p v-if="!note.title && !note.body" class="text-sm italic text-neutral-400">Empty note</p>
+      <p v-if="!note.title && !note.body && !note.attachments.length" class="text-sm italic text-neutral-400">
+        Empty note
+      </p>
     </button>
 
     <div v-if="note.labels.length" class="mt-2 flex flex-wrap gap-1">
diff --git a/frontend/src/components/NoteEditor.vue b/frontend/src/components/NoteEditor.vue
index e698ee6..a2ade27 100644
--- a/frontend/src/components/NoteEditor.vue
+++ b/frontend/src/components/NoteEditor.vue
@@ -67,6 +67,38 @@ async function toggleKind() {
   await notes.setKind(props.note.id, "list");
 }
 
+const fileInput = ref<HTMLInputElement | null>(null);
+const uploadError = ref("");
+
+function pickImage() {
+  fileInput.value?.click();
+}
+
+async function uploadFile(file: File) {
+  uploadError.value = "";
+  try {
+    await notes.uploadAttachment(props.note.id, file);
+  } catch (e) {
+    uploadError.value = (e as { error?: string }).error ?? "Could not upload image.";
+  }
+}
+
+async function onFileChange(e: Event) {
+  const input = e.target as HTMLInputElement;
+  const file = input.files?.[0];
+  if (file) await uploadFile(file);
+  input.value = "";
+}
+
+async function onPaste(e: ClipboardEvent) {
+  const item = Array.from(e.clipboardData?.items ?? []).find((i) => i.type.startsWith("image/"));
+  const file = item?.getAsFile();
+  if (file) {
+    e.preventDefault();
+    await uploadFile(file);
+  }
+}
+
 async function close() {
   const changed =
     (title.value.trim() || null) !== (props.note.title ?? null) ||
@@ -94,8 +126,23 @@ async function act(fn: () => Promise<void>) {
       role="dialog"
       aria-modal="true"
       @keydown.esc="close"
+      @paste="onPaste"
     >
       <div class="flex flex-col gap-2 p-4">
+        <div v-if="liveNote.attachments.length" class="flex flex-wrap gap-2">
+          <div v-for="att in liveNote.attachments" :key="att.id" class="group/att relative">
+            <img :src="att.url" alt="" class="h-24 w-24 rounded-lg object-cover" />
+            <button
+              type="button"
+              class="absolute right-1 top-1 rounded-full bg-black/50 px-1.5 text-white opacity-0 transition group-hover/att:opacity-100"
+              aria-label="Remove image"
+              @click="notes.deleteAttachment(note.id, att.id)"
+            >
+              ×
+            </button>
+          </div>
+        </div>
+        <p v-if="uploadError" class="text-xs text-red-600 dark:text-red-400">{{ uploadError }}</p>
         <input
           v-model="title"
           type="text"
@@ -134,6 +181,23 @@ async function act(fn: () => Promise<void>) {
       <div class="flex items-center justify-between gap-2 border-t border-neutral-100 px-3 py-2 dark:border-neutral-800">
         <ColorPicker v-model="color" />
         <div class="flex items-center gap-0.5">
+          <button
+            v-if="!note.trashed"
+            type="button"
+            class="icon-btn"
+            title="Add image"
+            aria-label="Add image"
+            @click="pickImage"
+          >
+            <Icon name="image" />
+          </button>
+          <input
+            ref="fileInput"
+            type="file"
+            accept="image/png,image/jpeg,image/gif,image/webp"
+            class="hidden"
+            @change="onFileChange"
+          />
           <button
             v-if="!note.trashed"
             type="button"
diff --git a/frontend/src/stores/notes.ts b/frontend/src/stores/notes.ts
index d66aaa2..0b094eb 100644
--- a/frontend/src/stores/notes.ts
+++ b/frontend/src/stores/notes.ts
@@ -18,6 +18,12 @@ export interface ChecklistItem {
   position: number;
 }
 
+export interface Attachment {
+  id: string;
+  url: string;
+  mime: string;
+}
+
 export interface Note {
   id: string;
   title: string | null;
@@ -29,6 +35,7 @@ export interface Note {
   trashed: boolean;
   labels: NoteLabel[];
   items: ChecklistItem[];
+  attachments: Attachment[];
   created_at: string | null;
   updated_at: string | null;
 }
@@ -113,6 +120,25 @@ export const useNotesStore = defineStore("notes", () => {
     reconcile(await api.del<Note>(`/api/notes/${id}/items/${itemId}`));
   }
 
+  async function uploadAttachment(id: string, file: File): Promise<void> {
+    const form = new FormData();
+    form.append("file", file);
+    const resp = await fetch(`/api/notes/${id}/attachments`, { method: "POST", credentials: "include", body: form });
+    const data: unknown = await resp.json().catch(() => ({}));
+    if (!resp.ok) {
+      const message =
+        typeof data === "object" && data !== null && "error" in data
+          ? String((data as { error: unknown }).error)
+          : "Upload failed.";
+      throw { error: message, status: resp.status };
+    }
+    reconcile(data as Note);
+  }
+
+  async function deleteAttachment(id: string, attId: string): Promise<void> {
+    reconcile(await api.del<Note>(`/api/notes/${id}/attachments/${attId}`));
+  }
+
   async function trash(id: string): Promise<void> {
     reconcile(await api.post<Note>(`/api/notes/${id}/trash`));
   }
@@ -143,6 +169,8 @@ export const useNotesStore = defineStore("notes", () => {
     addItem,
     updateItem,
     deleteItem,
+    uploadAttachment,
+    deleteAttachment,
     trash,
     restore,
     deleteForever,
diff --git a/src/thoughtsync/app.py b/src/thoughtsync/app.py
index 8000ebd..b48baf8 100644
--- a/src/thoughtsync/app.py
+++ b/src/thoughtsync/app.py
@@ -28,6 +28,7 @@ def create_app() -> Quart:
     app.config["SESSION_COOKIE_HTTPONLY"] = True
     app.config["SESSION_COOKIE_SAMESITE"] = "Lax"
     app.config["PERMANENT_SESSION_LIFETIME"] = timedelta(days=30)
+    app.config["MAX_CONTENT_LENGTH"] = 12 * 1024 * 1024  # image-upload body cap
 
     app.register_blueprint(auth_bp)
     app.register_blueprint(notes_bp)
diff --git a/src/thoughtsync/models/all.py b/src/thoughtsync/models/all.py
index f4bd49b..9c5bdb6 100644
--- a/src/thoughtsync/models/all.py
+++ b/src/thoughtsync/models/all.py
@@ -3,4 +3,4 @@
 Imported for side effects only (model registration on Base.metadata).
 """
 
-from . import group, label, note, note_item, settings, share, user  # noqa: F401
+from . import group, label, note, note_attachment, note_item, settings, share, user  # noqa: F401
diff --git a/src/thoughtsync/models/note_attachment.py b/src/thoughtsync/models/note_attachment.py
new file mode 100644
index 0000000..09e8a1f
--- /dev/null
+++ b/src/thoughtsync/models/note_attachment.py
@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import uuid
+from datetime import datetime
+
+from sqlalchemy import BigInteger, DateTime, ForeignKey, Text, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from . import Base
+
+
+class NoteAttachment(Base):
+    """An image uploaded onto a note. Bytes live under Config.media_root(); this
+    row records the relative path + metadata."""
+
+    __tablename__ = "note_attachments"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    note_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("notes.id", ondelete="CASCADE"), nullable=False
+    )
+    path: Mapped[str] = mapped_column(Text(), nullable=False)  # relative to media_root
+    mime: Mapped[str] = mapped_column(Text(), nullable=False)
+    size: Mapped[int] = mapped_column(BigInteger(), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
diff --git a/src/thoughtsync/notes.py b/src/thoughtsync/notes.py
index 68bc6c0..87df1a5 100644
--- a/src/thoughtsync/notes.py
+++ b/src/thoughtsync/notes.py
@@ -1,18 +1,23 @@
 from __future__ import annotations
 
+import os
 import uuid
 from datetime import datetime, timezone
 
-from quart import Blueprint, g, jsonify, request
+from quart import Blueprint, g, jsonify, request, send_file
 from sqlalchemy import delete, func, literal_column, select
 
 from .acl import visible_to_user
 from .auth import login_required
+from .config import Config
 from .db import session_scope
 from .models.label import Label, NoteLabel
 from .models.note import NOTE_COLORS, Note
+from .models.note_attachment import NoteAttachment
 from .models.note_item import NoteItem
 
+ALLOWED_IMAGE_MIMES = {"image/png": ".png", "image/jpeg": ".jpg", "image/gif": ".gif", "image/webp": ".webp"}
+
 bp = Blueprint("notes", __name__, url_prefix="/api/notes")
 
 VALID_FILTERS = {"active", "archived", "trash"}
@@ -70,12 +75,34 @@ async def _items_for_notes(db, note_ids: list) -> dict:
     return result
 
 
+def _attachment_url(note_id, att_id) -> str:
+    return f"/api/notes/{note_id}/attachments/{att_id}"
+
+
+async def _attachments_for_notes(db, note_ids: list) -> dict:
+    result: dict = {}
+    if not note_ids:
+        return result
+    rows = (
+        await db.scalars(
+            select(NoteAttachment).where(NoteAttachment.note_id.in_(note_ids)).order_by(NoteAttachment.created_at)
+        )
+    ).all()
+    for att in rows:
+        result.setdefault(att.note_id, []).append(
+            {"id": str(att.id), "url": _attachment_url(att.note_id, att.id), "mime": att.mime}
+        )
+    return result
+
+
 async def _serialize_note(db, note: Note) -> dict:
     data = note.serialize()
     labels = await _labels_for_notes(db, [note.id])
     data["labels"] = labels.get(note.id, [])
     items = await _items_for_notes(db, [note.id])
     data["items"] = items.get(note.id, [])
+    attachments = await _attachments_for_notes(db, [note.id])
+    data["attachments"] = attachments.get(note.id, [])
     return data
 
 
@@ -83,11 +110,13 @@ async def _serialize_notes(db, notes: list) -> list:
     ids = [n.id for n in notes]
     labels_map = await _labels_for_notes(db, ids)
     items_map = await _items_for_notes(db, ids)
+    attach_map = await _attachments_for_notes(db, ids)
     out = []
     for n in notes:
         data = n.serialize()
         data["labels"] = labels_map.get(n.id, [])
         data["items"] = items_map.get(n.id, [])
+        data["attachments"] = attach_map.get(n.id, [])
         out.append(data)
     return out
 
@@ -327,6 +356,84 @@ async def reorder_items(note_id: str):
         return jsonify(await _serialize_note(db, note))
 
 
+@bp.post("/<note_id>/attachments")
+@login_required
+async def upload_attachment(note_id: str):
+    async with session_scope() as db:
+        note = await _get_owned(db, note_id)
+        if note is None:
+            return jsonify({"error": "not found"}), 404
+        files = await request.files
+        upload = files.get("file")
+        if upload is None:
+            return jsonify({"error": "no file provided"}), 400
+        mime = (upload.content_type or "").split(";")[0].strip().lower()
+        ext = ALLOWED_IMAGE_MIMES.get(mime)
+        if ext is None:
+            return jsonify({"error": "unsupported image type (png, jpeg, gif, webp only)"}), 415
+        att_id = uuid.uuid4()
+        rel = os.path.join(str(note.id), f"{att_id}{ext}")
+        dest = Config.media_root() / rel
+        dest.parent.mkdir(parents=True, exist_ok=True)
+        await upload.save(str(dest))
+        db.add(NoteAttachment(id=att_id, note_id=note.id, path=rel, mime=mime, size=dest.stat().st_size))
+        await db.commit()
+        return jsonify(await _serialize_note(db, note)), 201
+
+
+@bp.get("/<note_id>/attachments/<att_id>")
+@login_required
+async def get_attachment(note_id: str, att_id: str):
+    try:
+        nid = uuid.UUID(note_id)
+        aid = uuid.UUID(att_id)
+    except (ValueError, TypeError):
+        return jsonify({"error": "not found"}), 404
+    async with session_scope() as db:
+        # Owner OR shared may view (rule 47).
+        note = await db.scalar(
+            select(Note).where(Note.id == nid, visible_to_user("note", Note.owner_id, Note.id, g.user_id))
+        )
+        if note is None:
+            return jsonify({"error": "not found"}), 404
+        att = await db.scalar(select(NoteAttachment).where(NoteAttachment.id == aid, NoteAttachment.note_id == nid))
+        if att is None:
+            return jsonify({"error": "not found"}), 404
+        mime = att.mime
+        file_path = Config.media_root() / att.path
+    if not file_path.is_file():
+        return jsonify({"error": "not found"}), 404
+    response = await send_file(str(file_path), mimetype=mime)
+    response.headers["X-Content-Type-Options"] = "nosniff"
+    response.headers["Cache-Control"] = "private, max-age=86400"
+    return response
+
+
+@bp.delete("/<note_id>/attachments/<att_id>")
+@login_required
+async def delete_attachment(note_id: str, att_id: str):
+    try:
+        aid = uuid.UUID(att_id)
+    except (ValueError, TypeError):
+        return jsonify({"error": "not found"}), 404
+    async with session_scope() as db:
+        note = await _get_owned(db, note_id)
+        if note is None:
+            return jsonify({"error": "not found"}), 404
+        att = await db.scalar(select(NoteAttachment).where(NoteAttachment.id == aid, NoteAttachment.note_id == note.id))
+        if att is None:
+            return jsonify({"error": "not found"}), 404
+        file_path = Config.media_root() / att.path
+        await db.delete(att)
+        await db.commit()
+        result = await _serialize_note(db, note)
+    try:
+        file_path.unlink(missing_ok=True)
+    except OSError:
+        pass
+    return jsonify(result)
+
+
 @bp.post("/<note_id>/trash")
 @login_required
 async def trash_note(note_id: str):
diff --git a/tests/test_notes.py b/tests/test_notes.py
index 74dbcac..a26cf89 100644
--- a/tests/test_notes.py
+++ b/tests/test_notes.py
@@ -62,3 +62,9 @@ async def test_add_item_requires_auth(app):
     client = app.test_client()
     resp = await client.post("/api/notes/00000000-0000-0000-0000-000000000000/items", json={"text": "x"})
     assert resp.status_code == 401
+
+
+async def test_upload_attachment_requires_auth(app):
+    client = app.test_client()
+    resp = await client.post("/api/notes/00000000-0000-0000-0000-000000000000/attachments")
+    assert resp.status_code == 401