Client-side execution model.
PDFSimplify processes PDF documents directly within your browser session rather than uploading files to remote conversion queues. Here is how our memory sandbox, network boundaries, and transport security work.
No Document Uploads
Traditional document web services require uploading confidential PDFs over HTTP to remote servers. The remote server stores the file on disk, runs worker scripts, and streams the result back.
PDFSimplify executes all supported PDF operations—merging, splitting, rotating, extracting, compressing, visual signing, and client-side OCR—locally on your machine via JavaScript, HTML5 Canvas, and WebAssembly (WASM).
Byte arrays and document objects reside only in temporary browser memory. Reloading or closing the tab immediately flushes all in-memory buffers. Our web hosting servers never receive or store your document bytes.
TLS & Content Security
While document processing occurs locally, our static application assets (HTML, CSS, JavaScript bundles, WebAssembly binaries, and web fonts) are distributed across globally authenticated Content Delivery Networks over encrypted HTTPS.
- •Modern TLS: All web traffic is strictly encrypted in transit with HTTP Strict Transport Security (HSTS).
- •Static Zero-Database Architecture: Because PDFSimplify is statically exported, there are no dynamic server-side database endpoints or user document storage repositories that could be subjected to server-side SQL injection or credential leaks.
Responsible Security Boundaries
We believe responsible engineering requires stating realistic boundaries clearly rather than making untruthful "100% unhackable" marketing claims:
- A.Device Security & Extensions: Because processing runs inside your browser, rogue extensions or malware installed on your computer could inspect page memory. Keep your browser updated and use extensions from trusted sources.
- B.Visual Signatures vs PKI: Our Sign PDF tool places visual stamp signatures onto documents. It does not issue qualified electronic signatures (QES) or cryptographic X.509 PKI certificates.
- C.Zero Document Custody Means No Server Backups: Because we never store copies of your files, we cannot recover or restore documents once closed. Retain your original files before modifications.
Advertising Segregation
PDFSimplify is supported by digital advertising through Google and publisher ad networks. Your document contents, page text, form fields, and images are completely segregated in local memory and are never transmitted to any advertising partners.
Standard web diagnostics and cookies are handled separately according to our Privacy Policy and Cookie Policy.
Security Contact
If you are a security researcher with questions about our client-side architecture or wish to report a static asset issue, please contact us directly at [email protected].