diff --git a/src/client/index.js b/src/client/index.js
index 652b5544..e1a54f60 100644
--- a/src/client/index.js
+++ b/src/client/index.js
@@ -365,6 +365,9 @@ function createSimpleClient(serverUrl, clientOptions = {}) {
  * @param {number} [options.threshold] - CIEDE2000 Delta E threshold for this screenshot
  * @param {number} [options.minClusterSize] - Minimum changed cluster size for this screenshot
  * @param {boolean} [options.fullPage] - Whether this is a full page screenshot
+ * @param {string} [options.captureMode] - Capture coordinate mode
+ * @param {number} [options.deviceScaleFactor] - Bitmap pixels per CSS pixel
+ * @param {string} [options.selector] - Selector used for an element capture
  *
  * @returns {Promise<Object|null>} Screenshot result from the server, or null when capture is skipped
  *
diff --git a/src/types/client.d.ts b/src/types/client.d.ts
index f46d9cb6..2dacce71 100644
--- a/src/types/client.d.ts
+++ b/src/types/client.d.ts
@@ -86,6 +86,12 @@ export function vizzlyScreenshot(
     threshold?: number;
     minClusterSize?: number;
     fullPage?: boolean;
+    /** Coordinate frame used by the harness that captured the image. */
+    captureMode?: 'viewport' | 'full_page' | 'element' | 'component';
+    /** Bitmap pixels per CSS pixel reported by the capture harness. */
+    deviceScaleFactor?: number;
+    /** Exact selector used when captureMode is element or component. */
+    selector?: string;
     /** Transport-only build ID used to route the request. */
     buildId?: string;
     /** Client-side HTTP timeout in milliseconds; not stored as metadata. */
diff --git a/src/types/index.d.ts b/src/types/index.d.ts
index db1e343d..e214026e 100644
--- a/src/types/index.d.ts
+++ b/src/types/index.d.ts
@@ -78,6 +78,12 @@ export interface ScreenshotOptions {
   threshold?: number;
   minClusterSize?: number;
   fullPage?: boolean;
+  /** Coordinate frame used by the harness that captured the image. */
+  captureMode?: 'viewport' | 'full_page' | 'element' | 'component';
+  /** Bitmap pixels per CSS pixel reported by the capture harness. */
+  deviceScaleFactor?: number;
+  /** Exact selector used when captureMode is element or component. */
+  selector?: string;
   /** Transport-only build ID used to route the request. */
   buildId?: string;
   /** Client-side HTTP timeout in milliseconds; not stored as metadata. */
diff --git a/src/utils/screenshot-options.js b/src/utils/screenshot-options.js
index 11e11f14..1a060097 100644
--- a/src/utils/screenshot-options.js
+++ b/src/utils/screenshot-options.js
@@ -15,6 +15,18 @@ export let RESERVED_PROPERTY_OPTIONS = Object.freeze({
     message:
       'Move "fullPage" out of properties; properties is only for user metadata.',
   },
+  captureMode: {
+    message:
+      'Move "captureMode" out of properties; properties is only for user metadata.',
+  },
+  deviceScaleFactor: {
+    message:
+      'Move "deviceScaleFactor" out of properties; properties is only for user metadata.',
+  },
+  selector: {
+    message:
+      'Move "selector" out of properties; properties is only for user metadata.',
+  },
   buildId: {
     message:
       'Move "buildId" out of properties; properties is only for user metadata.',
@@ -36,6 +48,10 @@ function createReservedPropertyWarning(option) {
 /**
  * Normalize screenshot SDK options into the properties payload consumed by the
  * local TDD server and cloud-compatible comparison path.
+ *
+ * Capture geometry is reserved because the cloud must receive the facts from the
+ * harness that took the image. Dropping these values would force the API to guess
+ * a coordinate space from bitmap dimensions after the capture already happened.
  */
 export function normalizeScreenshotOptions(options = {}) {
   let {
@@ -45,6 +61,9 @@ export function normalizeScreenshotOptions(options = {}) {
     threshold,
     minClusterSize,
     fullPage,
+    captureMode,
+    deviceScaleFactor,
+    selector,
   } = options;
 
   let warnings = [];
@@ -59,6 +78,13 @@ export function normalizeScreenshotOptions(options = {}) {
         minClusterSize = value;
       }
       if (key === 'fullPage' && fullPage === undefined) fullPage = value;
+      if (key === 'captureMode' && captureMode === undefined) {
+        captureMode = value;
+      }
+      if (key === 'deviceScaleFactor' && deviceScaleFactor === undefined) {
+        deviceScaleFactor = value;
+      }
+      if (key === 'selector' && selector === undefined) selector = value;
       if (key === 'buildId' && buildId === undefined) buildId = value;
       if (key === 'requestTimeout' && requestTimeout === undefined) {
         requestTimeout = value;
@@ -82,6 +108,18 @@ export function normalizeScreenshotOptions(options = {}) {
     normalizedProperties.fullPage = fullPage;
   }
 
+  if (captureMode !== undefined) {
+    normalizedProperties.captureMode = captureMode;
+  }
+
+  if (deviceScaleFactor !== undefined) {
+    normalizedProperties.deviceScaleFactor = deviceScaleFactor;
+  }
+
+  if (selector !== undefined) {
+    normalizedProperties.selector = selector;
+  }
+
   return {
     buildId,
     requestTimeout,
diff --git a/tests/sdk/client.test.js b/tests/sdk/client.test.js
index e6ce2604..6ae38353 100644
--- a/tests/sdk/client.test.js
+++ b/tests/sdk/client.test.js
@@ -495,6 +495,27 @@ describe('client/index httpPost integration tests', () => {
     });
   });
 
+  it('preserves capture geometry for cloud identity and region evidence', async () => {
+    await vizzlyScreenshot('test', Buffer.from('data'), {
+      captureMode: 'element',
+      deviceScaleFactor: 2,
+      selector: '[data-testid="account-card"]',
+      properties: {
+        browser: 'chromium',
+        viewport: { width: 1440, height: 900 },
+      },
+    });
+
+    assert.strictEqual(requests.length, 1);
+    assert.deepStrictEqual(requests[0].body.properties, {
+      browser: 'chromium',
+      viewport: { width: 1440, height: 900 },
+      captureMode: 'element',
+      deviceScaleFactor: 2,
+      selector: '[data-testid="account-card"]',
+    });
+  });
+
   it('lets explicit comparison options override nested properties', async () => {
     await vizzlyScreenshot('test', Buffer.from('data'), {
       threshold: 0,