diff --git a/__init__.py b/__init__.py
index 9737197..52a91cc 100644
--- a/__init__.py
+++ b/__init__.py
@@ -187,6 +187,7 @@ class ModelResolverExtension:
                     search_local_matches_by_hash,
                     search_local_matches,
                 )
+                from .core.workflow_analyzer import analyze_workflow_models
                 from .core.path_templates import infer_download_path_templates
                 from .core.metadata_audit import audit_metadata_sizes
                 from .core.metadata_builder import (
@@ -673,6 +674,105 @@ class ModelResolverExtension:
                     get_local_model_hash_metadata(path, model=model)
                 )
 
+            @routes.post("/model_resolver/workflow-model-hashes")
+            @json_api_endpoint("workflow-model-hashes")
+            async def workflow_model_hashes(request):
+                """Return hash metadata for existing local models used by a workflow."""
+                data = await request.json()
+                workflow_json = data.get("workflow")
+                if not isinstance(workflow_json, dict):
+                    return web.json_response(
+                        {"error": "Workflow JSON must be an object"}, status=400
+                    )
+
+                settings = await asyncio.to_thread(load_resolver_settings)
+                if not resolver_bool_setting(
+                    settings.get("workflow_hash_metadata_enabled"), True
+                ):
+                    return web.json_response(
+                        {
+                            "success": True,
+                            "enabled": False,
+                            "models": [],
+                            "by_node": {},
+                            "by_path": {},
+                            "count": 0,
+                        }
+                    )
+
+                available_models = await asyncio.to_thread(get_model_files, False)
+                refs = await asyncio.to_thread(
+                    analyze_workflow_models,
+                    workflow_json,
+                    available_models,
+                )
+
+                by_node = {}
+                by_path = {}
+                models = []
+                seen = set()
+
+                for ref in refs:
+                    if not isinstance(ref, dict) or not ref.get("exists"):
+                        continue
+                    full_path = str(ref.get("full_path") or "").strip()
+                    if not full_path:
+                        continue
+                    model_info = {
+                        "path": full_path,
+                        "filename": get_filename_from_path(full_path),
+                        "relative_path": ref.get("original_path") or "",
+                        "category": ref.get("category") or "",
+                    }
+                    metadata = get_local_model_hash_metadata(
+                        full_path, model=model_info
+                    )
+                    sha256 = normalize_sha256(metadata.get("sha256"))
+                    if not sha256:
+                        continue
+
+                    entry = {
+                        "node_id": ref.get("node_id"),
+                        "node_type": ref.get("node_type") or "",
+                        "widget_index": ref.get("widget_index"),
+                        "widget_name": ref.get("widget_name") or "",
+                        "path": ref.get("original_path") or "",
+                        "filename": get_filename_from_path(
+                            ref.get("original_path") or full_path
+                        ),
+                        "category": ref.get("category") or "",
+                        "sha256": sha256,
+                        "size": metadata.get("size") or 0,
+                    }
+                    entry_key = (
+                        str(entry.get("node_id")),
+                        str(entry.get("widget_index")),
+                        entry.get("path"),
+                        sha256,
+                    )
+                    if entry_key in seen:
+                        continue
+                    seen.add(entry_key)
+                    models.append(entry)
+
+                    path_key = str(entry.get("path") or entry.get("filename") or "")
+                    if path_key:
+                        by_path[path_key] = entry
+                        by_path[get_filename_from_path(path_key)] = entry
+                    node_key = f"{entry.get('node_id')}:{entry.get('widget_index')}"
+                    by_node[node_key] = entry
+
+                return web.json_response(
+                    {
+                        "success": True,
+                        "enabled": True,
+                        "models": models,
+                        "by_node": by_node,
+                        "by_path": by_path,
+                        "count": len(models),
+                    }
+                )
+
             @routes.post("/model_resolver/local-matches-by-hash")
             @json_api_endpoint("local-matches-by-hash")
             async def local_matches_by_hash(request):
diff --git a/core/resolver.py b/core/resolver.py
index 0aa079c..5b7884c 100644
--- a/core/resolver.py
+++ b/core/resolver.py
@@ -287,6 +287,98 @@ def get_workflow_url_info_for_filename(
     return None
 
 
+def _workflow_hash_entry_candidates(entry: Any) -> List[Dict[str, Any]]:
+    if not isinstance(entry, dict):
+        return []
+    sha256 = normalize_sha256(extract_sha256_from_metadata(entry))
+    if not sha256:
+        return []
+    return [{**entry, "sha256": sha256}]
+
+
+def _collect_workflow_hash_entries(value: Any) -> List[Dict[str, Any]]:
+    if not isinstance(value, dict):
+        return []
+
+    entries: List[Dict[str, Any]] = []
+    for key in (
+        "model_resolver_hashes",
+        "anomalous_hashes",
+        "model_hashes",
+        "hashes",
+    ):
+        raw = value.get(key)
+        if isinstance(raw, dict):
+            for nested_key in ("models", "by_path", "by_node"):
+                nested = raw.get(nested_key)
+                if isinstance(nested, list):
+                    for item in nested:
+                        entries.extend(_workflow_hash_entry_candidates(item))
+                elif isinstance(nested, dict):
+                    for item in nested.values():
+                        entries.extend(_workflow_hash_entry_candidates(item))
+            entries.extend(_workflow_hash_entry_candidates(raw))
+        elif isinstance(raw, list):
+            for item in raw:
+                entries.extend(_workflow_hash_entry_candidates(item))
+    return entries
+
+
+def extract_workflow_hash_metadata(workflow_json: Dict[str, Any]) -> Dict[str, Dict[str, Any]]:
+    """Return embedded workflow SHA256 metadata indexed by path, filename, and node/widget."""
+    if not isinstance(workflow_json, dict):
+        return {}
+
+    entries: List[Dict[str, Any]] = []
+    entries.extend(_collect_workflow_hash_entries(workflow_json))
+    extra = workflow_json.get("extra")
+    if isinstance(extra, dict):
+        entries.extend(_collect_workflow_hash_entries(extra))
+
+    index: Dict[str, Dict[str, Any]] = {}
+    for entry in entries:
+        sha256 = normalize_sha256(entry.get("sha256"))
+        if not sha256:
+            continue
+        normalized = {**entry, "sha256": sha256}
+        for candidate in (
+            entry.get("path"),
+            entry.get("original_path"),
+            entry.get("filename"),
+            entry.get("name"),
+            entry.get("file_name"),
+        ):
+            text = str(candidate or "").strip()
+            if not text:
+                continue
+            index[text] = normalized
+            index[get_filename_from_path(text)] = normalized
+        node_id = entry.get("node_id")
+        widget_index = entry.get("widget_index")
+        if node_id is not None and widget_index is not None:
+            index[f"{node_id}:{widget_index}"] = normalized
+    return index
+
+
+def get_workflow_hash_info_for_ref(
+    workflow_hashes: Dict[str, Dict[str, Any]], model_ref: Dict[str, Any]
+) -> Optional[Dict[str, Any]]:
+    if not workflow_hashes:
+        return None
+    original_path = str(model_ref.get("original_path") or "")
+    candidates = [
+        f"{model_ref.get('node_id')}:{model_ref.get('widget_index')}",
+        original_path,
+        get_filename_from_path(original_path),
+        model_ref.get("filename") or "",
+        model_ref.get("name") or "",
+    ]
+    for candidate in candidates:
+        if candidate and candidate in workflow_hashes:
+            return workflow_hashes[candidate]
+    return None
+
+
 def workflow_has_nodes(workflow_json: Dict[str, Any]) -> bool:
     """Return True when the active top-level workflow contains nodes."""
     if not isinstance(workflow_json, dict):
@@ -599,6 +691,12 @@ def get_local_model_hash_metadata(
 
     normalized_path = os.path.abspath(os.path.normpath(raw_path))
     exists = os.path.exists(normalized_path)
+    file_size = 0
+    if exists and os.path.isfile(normalized_path):
+        try:
+            file_size = os.path.getsize(normalized_path)
+        except OSError:
+            file_size = 0
     model_info: Dict[str, Any] = {
         **(model if isinstance(model, dict) else {}),
         "path": normalized_path,
@@ -620,6 +718,7 @@ def get_local_model_hash_metadata(
                     "hash_status": last_hash_status,
                     "hashes": hashes,
                     "sha256": hashes[0],
+                    "size": file_size,
                 }
 
     return {
@@ -628,6 +727,7 @@ def get_local_model_hash_metadata(
         "hash_status": last_hash_status,
         "hashes": [],
         "sha256": "",
+        "size": file_size,
     }
 
 
@@ -879,6 +979,8 @@ def analyze_and_find_matches(
     # Extract URLs from workflow (node.properties.models + regex)
     workflow_urls = extract_workflow_urls(workflow_json)
     log.debug(f"Extracted {len(workflow_urls)} URLs from workflow")
+    workflow_hashes = extract_workflow_hash_metadata(workflow_json)
+    log.debug(f"Extracted {len(workflow_hashes)} workflow hash metadata keys")
 
     if progress_callback:
         progress_callback(
@@ -944,6 +1046,10 @@ def analyze_and_find_matches(
             missing["workflow_model_url"] = url_info.get("model_url", "")
             missing["workflow_directory"] = url_info.get("directory", "")
             missing["url_source"] = url_info.get("source", "")
+        hash_info = get_workflow_hash_info_for_ref(workflow_hashes, missing)
+        if hash_info:
+            missing["workflow_sha256"] = normalize_sha256(hash_info.get("sha256"))
+            missing["hash_lookup_source"] = hash_info.get("source") or "workflow_metadata"
 
     # Handle URNs: mark for async resolution by frontend
     # No sync CivitAI calls here - frontend will fetch asynchronously
@@ -1049,13 +1155,32 @@ def analyze_and_find_matches(
 
     def find_local_matches_for_ref(model_ref: Dict[str, Any]) -> List[Dict[str, Any]]:
         target_for_matching = get_match_target(model_ref)
-        if not target_for_matching:
-            return []
-
         category = get_match_category(model_ref)
+        workflow_sha256 = normalize_sha256(model_ref.get("workflow_sha256"))
+        hash_matches = []
+        if workflow_sha256:
+            hash_matches = search_local_matches_by_hash(
+                workflow_sha256,
+                category=category,
+                max_matches=max_matches_per_model,
+                force_rescan=False,
+            )
+            hash_matches = [
+                {
+                    **match,
+                    "hash_lookup_source": model_ref.get("hash_lookup_source") or "workflow_metadata",
+                    "hash_lookup_filename": get_filename_from_path(model_ref.get("original_path") or ""),
+                    "hash_lookup_sha256": workflow_sha256,
+                }
+                for match in hash_matches
+            ]
+
+        if not target_for_matching:
+            return hash_matches
+
         cache_key = (target_for_matching, category)
         if cache_key in local_match_cache:
-            return local_match_cache[cache_key]
+            return deduplicate_matches(hash_matches + local_match_cache[cache_key])
 
         matches = find_matches(
             target_for_matching,
@@ -1068,7 +1193,7 @@ def analyze_and_find_matches(
             active_downloads_by_path,
         )
         local_match_cache[cache_key] = deduplicated_matches
-        return deduplicated_matches
+        return deduplicate_matches(hash_matches + deduplicated_matches)
 
     # Find matches for each missing model
     missing_with_matches = []
diff --git a/core/settings.py b/core/settings.py
index 3a73895..69e5feb 100644
--- a/core/settings.py
+++ b/core/settings.py
@@ -163,6 +163,9 @@ def normalize_download_backend(value: Any) -> str:
 
 def normalize_settings(settings: Optional[Mapping[str, Any]]) -> Dict[str, Any]:
     data = dict(settings or {})
+    data["workflow_hash_metadata_enabled"] = bool_setting(
+        data.get("workflow_hash_metadata_enabled"), True
+    )
     data["download_backend"] = normalize_download_backend(data.get("download_backend"))
     data["aria2c_path"] = str(data.get("aria2c_path") or "").strip()
     data["aria2_auto_stop_daemon"] = bool_setting(
diff --git a/web/resolver/model_resolver.js b/web/resolver/model_resolver.js
index 191a738..25dcef2 100644
--- a/web/resolver/model_resolver.js
+++ b/web/resolver/model_resolver.js
@@ -98,6 +98,10 @@ export class ModelResolver {
         this.dialog = null;
         this.isCheckingMissing = false;  // Prevent multiple simultaneous checks
         this.lastCheckedWorkflow = null;  // Track to avoid duplicate checks
+        this.workflowHashMetadataCache = null;
+        this.workflowHashMetadataSignature = null;
+        this.workflowHashMetadataRefreshTimer = null;
+        this.workflowHashMetadataRefreshing = false;
     }
 
     setup = async () => {
@@ -117,6 +121,7 @@ export class ModelResolver {
 
         // Listen for workflow load events to auto-check for missing models
         this.setupAutoOpenOnMissingModels();
+        this.setupWorkflowHashMetadataInjection();
         this.setupActiveWorkflowChangeListeners();
 
         const sidebarRegistered = this.registerSidebarButton();
@@ -509,10 +514,111 @@ export class ModelResolver {
     }
 
     handleActiveWorkflowRouteChange(reason = 'workflow-change') {
+        this.scheduleWorkflowHashMetadataRefresh();
         if (!this.dialog?.isVisible()) return;
         this.dialog.scheduleActiveWorkflowRefresh(reason);
     }
 
+    isWorkflowHashMetadataEnabled() {
+        return localStorage.getItem('ModelResolver.workflowHashMetadataEnabled') !== 'false';
+    }
+
+    setupWorkflowHashMetadataInjection() {
+        window.__ModelResolverWorkflowHashMetadataOwner = this;
+        if (window.__ModelResolverWorkflowHashMetadataPatched) {
+            this.scheduleWorkflowHashMetadataRefresh();
+            return;
+        }
+
+        if (!app?.graph || typeof app.graph.serialize !== 'function') return;
+
+        const originalSerialize = app.graph.serialize;
+        app.graph.serialize = function(...args) {
+            const workflow = originalSerialize.apply(this, args);
+            window.__ModelResolverWorkflowHashMetadataOwner?.injectWorkflowHashMetadata(workflow);
+            window.__ModelResolverWorkflowHashMetadataOwner?.scheduleWorkflowHashMetadataRefresh(workflow);
+            return workflow;
+        };
+        window.__ModelResolverWorkflowHashMetadataPatched = true;
+        this.scheduleWorkflowHashMetadataRefresh();
+    }
+
+    injectWorkflowHashMetadata(workflow) {
+        if (!workflow || typeof workflow !== 'object') return workflow;
+        if (!this.isWorkflowHashMetadataEnabled()) return workflow;
+
+        const cache = this.workflowHashMetadataCache;
+        if (!cache || !Array.isArray(cache.models) || !cache.models.length) return workflow;
+
+        workflow.extra = workflow.extra && typeof workflow.extra === 'object' ? workflow.extra : {};
+        workflow.extra.model_resolver_hashes = {
+            version: 1,
+            source: 'comfyui-model-resolver',
+            models: cache.models,
+            updated_at: cache.updated_at || Date.now()
+        };
+        return workflow;
+    }
+
+    scheduleWorkflowHashMetadataRefresh(workflow = null) {
+        if (!this.isWorkflowHashMetadataEnabled()) return;
+        if (this.workflowHashMetadataRefreshTimer) {
+            clearTimeout(this.workflowHashMetadataRefreshTimer);
+        }
+        this.workflowHashMetadataRefreshTimer = setTimeout(() => {
+            this.workflowHashMetadataRefreshTimer = null;
+            this.refreshWorkflowHashMetadata(workflow);
+        }, 800);
+    }
+
+    async refreshWorkflowHashMetadata(workflow = null) {
+        if (this.workflowHashMetadataRefreshing || !this.isWorkflowHashMetadataEnabled()) return;
+
+        const currentWorkflow = workflow || app?.graph?.serialize?.();
+        if (!currentWorkflow) return;
+
+        let signature = '';
+        try {
+            signature = JSON.stringify((currentWorkflow.nodes || []).map((node) => [
+                node?.id,
+                node?.type,
+                node?.widgets_values
+            ]));
+        } catch (error) {
+            signature = '';
+        }
+        if (signature && signature === this.workflowHashMetadataSignature && this.workflowHashMetadataCache) {
+            return;
+        }
+
+        this.workflowHashMetadataRefreshing = true;
+        try {
+            const response = await api.fetchApi('/model_resolver/workflow-model-hashes', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ workflow: currentWorkflow })
+            });
+            if (!response.ok) return;
+            const data = await response.json();
+            if (!data?.enabled) {
+                this.workflowHashMetadataCache = null;
+                this.workflowHashMetadataSignature = signature;
+                return;
+            }
+            this.workflowHashMetadataCache = {
+                models: Array.isArray(data.models) ? data.models : [],
+                by_path: data.by_path || {},
+                by_node: data.by_node || {},
+                updated_at: Date.now()
+            };
+            this.workflowHashMetadataSignature = signature;
+        } catch (error) {
+            log.debug('Model Resolver: workflow hash metadata refresh failed', error);
+        } finally {
+            this.workflowHashMetadataRefreshing = false;
+        }
+    }
+
     /**
      * Setup MutationObserver to detect ComfyUI's Missing Models popup and inject our button
      */
diff --git a/web/resolver/views/options_methods.js b/web/resolver/views/options_methods.js
index ad49216..84d3788 100644
--- a/web/resolver/views/options_methods.js
+++ b/web/resolver/views/options_methods.js
@@ -18,6 +18,7 @@ const SETTINGS_MAP = [
     { serverKey: 'auto_fill_base_model', localKey: 'ModelResolver.autoFillBaseModel', type: 'boolean', default: true },
     { serverKey: 'auto_fill_subfolder', localKey: 'ModelResolver.autoFillSubfolder', type: 'boolean', default: true },
     { serverKey: 'auto_refresh_comfy_models_after_apply', localKey: 'ModelResolver.autoRefreshComfyModelsAfterApply', type: 'boolean', default: true },
+    { serverKey: 'workflow_hash_metadata_enabled', localKey: 'ModelResolver.workflowHashMetadataEnabled', type: 'boolean', default: true },
     { serverKey: 'download_backend', localKey: 'ModelResolver.downloadBackend', type: 'backend', default: 'python' },
     { serverKey: 'aria2c_path', localKey: 'ModelResolver.aria2cPath', type: 'string', default: '' },
     { serverKey: 'aria2_auto_stop_daemon', localKey: 'ModelResolver.aria2AutoStopDaemon', type: 'boolean', default: true },
@@ -433,6 +434,15 @@ export const optionsMethods = {
                                                 <span class="mr-options-switch"></span>
                                             </span>
                                         </label>
+                                        <label class="mr-options-toggle-row">
+                                            <div class="mr-options-toggle-copy">
+                                                <span class="mr-options-toggle-title">Embed workflow hashes <span class="mr-tooltip-badge" data-tooltip="Adds SHA256 metadata for models used in saved workflows and image workflow JSON, so renamed files can be resolved by hash later.">?</span></span>
+                                            </div>
+                                            <span class="mr-options-toggle-control">
+                                                <input id="mr-options-workflow-hash-metadata" class="mr-options-switch-input" type="checkbox" ${tokens.workflow_hash_metadata_enabled ? 'checked' : ''}>
+                                                <span class="mr-options-switch"></span>
+                                            </span>
+                                        </label>
                                     </div>
                                 </div>
                             </div>
@@ -903,6 +913,7 @@ export const optionsMethods = {
         const autoFillBaseModelInput = this.contentElement.querySelector('#mr-options-auto-fill-base-model');
         const autoFillSubfolderInput = this.contentElement.querySelector('#mr-options-auto-fill-subfolder');
         const autoRefreshComfyModelsInput = this.contentElement.querySelector('#mr-options-auto-refresh-comfy-models');
+        const workflowHashMetadataInput = this.contentElement.querySelector('#mr-options-workflow-hash-metadata');
         const downloadBackendInput = this.contentElement.querySelector('#mr-options-download-backend');
         const aria2cPathInput = this.contentElement.querySelector('#mr-options-aria2c-path');
         const aria2InstallBtn = this.contentElement.querySelector('#mr-options-aria2-install');
@@ -3422,6 +3433,7 @@ export const optionsMethods = {
                     auto_fill_base_model: Boolean(autoFillBaseModelInput?.checked),
                     auto_fill_subfolder: Boolean(autoFillSubfolderInput?.checked),
                     auto_refresh_comfy_models_after_apply: Boolean(autoRefreshComfyModelsInput?.checked),
+                    workflow_hash_metadata_enabled: Boolean(workflowHashMetadataInput?.checked),
                     download_backend: downloadBackend,
                     aria2c_path: aria2cPathInput?.value?.trim() || '',
                     aria2_auto_stop_daemon: Boolean(aria2AutoStopInput?.checked),