Correct grammar, wording, branding, and metadata inconsistencies

Standardize product and file-format names, remove duplicate SEO
keywords, align related-tool descriptions with their headings, and
restore incomplete phrases in search and social metadata.

pdf-security.html

@@ -231,11 +231,11 @@
             <summary
               class="cursor-pointer font-semibold text-white flex items-center justify-between"
             >
-              Are these pdf security tools really free?
+              Are these PDF security tools really free?
               <i class="ph ph-caret-down text-xl"></i>
             </summary>
             <p class="mt-3 text-gray-400">
-              Yes! All BentoPDF pdf security tools are 100% free with no hidden
+              Yes! All BentoPDF PDF security tools are 100% free with no hidden
               fees, no premium tiers, and no subscription required. Use
               unlimited tools, unlimited times.
             </p>
@@ -250,8 +250,8 @@
             </summary>
             <p class="mt-3 text-gray-400">
               Absolutely! All processing happens entirely in your browser. Your
-              files never leave your device, are never uploaded to servers.
-              Complete privacy guaranteed.
+              files never leave your device and are never uploaded to servers.
+              Complete privacy is guaranteed.
             </p>
           </details>