diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 23742080..f2669038 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -147,6 +147,7 @@ jobs:
           node test-preflight-xss-gate.js
           node test-traces.js
           node test-issue-1648-m4-emoji-scan.js
+          node test-issue-1753-copy-url-slash.js
           node test-issue-1668-m3-typography.js
           node test-mqtt-status-panel.js
           node test-issue-1697-mqtt-mobile-e2e.js
diff --git a/public/nodes.js b/public/nodes.js
index ee66761c..d6d25e1b 100644
--- a/public/nodes.js
+++ b/public/nodes.js
@@ -769,7 +769,7 @@
       }
 
       // Copy URL
-      const nodeUrl = location.origin + '#/nodes/' + encodeURIComponent(n.public_key);
+      const nodeUrl = location.origin + '/#/nodes/' + encodeURIComponent(n.public_key);
       document.getElementById('copyUrlBtn')?.addEventListener('click', () => {
         const btn = document.getElementById('copyUrlBtn');
         window.copyToClipboard(nodeUrl, () => {
@@ -780,7 +780,7 @@
 
       // Copy short URL — issue #772. Uses an 8-char pubkey prefix; the
       // backend resolves it to the canonical pubkey when unambiguous.
-      const shortUrl = location.origin + '#/nodes/' + n.public_key.slice(0, 8);
+      const shortUrl = location.origin + '/#/nodes/' + n.public_key.slice(0, 8);
       document.getElementById('copyShortUrlBtn')?.addEventListener('click', () => {
         const btn = document.getElementById('copyShortUrlBtn');
         window.copyToClipboard(shortUrl, () => {
@@ -1577,7 +1577,7 @@
     const observers = h.observers || [];
     const recent = h.recentPackets || [];
     const hasLoc = n.lat != null && n.lon != null;
-    const nodeUrl = location.origin + '#/nodes/' + encodeURIComponent(n.public_key);
+    const nodeUrl = location.origin + '/#/nodes/' + encodeURIComponent(n.public_key);
 
     // Status calculation via shared helper
     const lastHeard = stats.lastHeard;
diff --git a/test-issue-1753-copy-url-slash.js b/test-issue-1753-copy-url-slash.js
new file mode 100644
index 00000000..9efcd1c6
--- /dev/null
+++ b/test-issue-1753-copy-url-slash.js
@@ -0,0 +1,62 @@
+/* test-issue-1753-copy-url-slash.js — regression test for issue #1753.
+ *
+ * Bug: Copy URL / Copy short URL buttons on the node detail page built URLs as
+ *   location.origin + '#/nodes/...'  ->  https://analyzer.00id.net#/nodes/...
+ * That's a malformed URL (missing the '/' between authority and fragment).
+ * Some mobile browsers reject it.
+ *
+ * Strategy: behavioral source-level check. The three URL-construction sites
+ * in public/nodes.js are simple string concatenations of `location.origin`
+ * with a hardcoded literal. The "real" assertion is on the literal itself —
+ * it MUST start with '/#/' (not '#/'). The test extracts every
+ *   location.origin + '<literal>'
+ * occurrence in public/nodes.js and asserts each literal begins with '/#/'.
+ * Reverting the fix (dropping the leading '/') re-introduces the failure.
+ */
+'use strict';
+const fs = require('fs');
+const path = require('path');
+const assert = require('assert');
+
+let passed = 0, failed = 0;
+function test(name, fn) {
+  try { fn(); passed++; console.log('  ✅ ' + name); }
+  catch (e) { failed++; console.log('  ❌ ' + name + ': ' + e.message); }
+}
+
+const src = fs.readFileSync(path.join(__dirname, 'public/nodes.js'), 'utf8');
+
+// Match: location.origin + '<literal>'  (single or double quotes)
+const re = /location\.origin\s*\+\s*(['"])([^'"]*)\1/g;
+const sites = [];
+let m;
+while ((m = re.exec(src)) !== null) {
+  const lineNo = src.slice(0, m.index).split('\n').length;
+  sites.push({ literal: m[2], lineNo });
+}
+
+console.log('issue-1753 copy-URL slash regression');
+
+test('found at least 3 location.origin + literal sites in public/nodes.js', () => {
+  assert.ok(sites.length >= 3,
+    'expected >=3 sites, found ' + sites.length + ': ' + JSON.stringify(sites));
+});
+
+for (const s of sites) {
+  test('public/nodes.js:' + s.lineNo + ' literal starts with "/#/" (got ' + JSON.stringify(s.literal) + ')', () => {
+    assert.ok(
+      s.literal.startsWith('/#/') || s.literal.startsWith('/'),
+      'location.origin + ' + JSON.stringify(s.literal) +
+      ' produces malformed URL (missing leading "/"). See issue #1753.'
+    );
+    // Specifically forbid '#/' as the literal start — that's the bug.
+    assert.ok(
+      !s.literal.startsWith('#/'),
+      'literal begins with "#/" — concatenating with location.origin yields ' +
+      '"<origin>#/..." which is malformed. Fix: prepend "/". See issue #1753.'
+    );
+  });
+}
+
+console.log('\n  ' + passed + ' passed, ' + failed + ' failed');
+process.exit(failed > 0 ? 1 : 0);