Our zero-upload architecture eliminates the attack surfaces that traditional online file tools expose. Here's how.
Traditional online PDF tools (iLovePDF, SmallPDF, Adobe Acrobat Online) accept file uploads to their servers, creating attack surfaces for file-based exploits, data breaches, and supply chain attacks. MiOffice's client-side architecture eliminates these surfaces entirely.
| Attack Surface | Traditional Apps | MiOffice |
|---|---|---|
| File Upload to Server | Critical — malicious file parsing, path traversal, arbitrary code execution | Eliminated — no file upload endpoint exists. Private & secure client-side architecture. |
| Server-Side File Processing | Critical — command injection via filenames, SSRF via embedded URLs, memory corruption | Eliminated — all file processing runs in client-side browser sandbox. |
| Data at Rest | High — database breach exposes all processed documents | Eliminated — no file data stored on any server. No database of user files exists. |
| Data in Transit | High — MITM on file upload/download, TLS stripping | Eliminated — files never transit network. Only static page assets are served over TLS 1.3 + HSTS. |
| User Authentication | High — credential stuffing, session hijacking, privilege escalation | Eliminated — no user accounts, no passwords, no sessions, no cookies tied to file operations. |
| API Endpoints | High — injection, broken access control, rate limiting bypass | Minimal — only analytics beacon endpoint. No file data in API requests. |
| Third-Party Dependencies (Server) | Medium — supply chain attacks on server libraries | Eliminated — no server-side file processing libraries. Processing modules are client-side and versioned. |
TLS 1.3 with strong cipher suites. HSTS with preload (max-age=31536000, includeSubDomains). Certificate transparency monitoring.
All file processing runs in sandboxed memory — isolated from the JavaScript heap and DOM. No access to filesystem, network, or system calls.
X-Content-Type-Options: nosniff. X-Frame-Options: DENY. Referrer-Policy: strict-origin-when-cross-origin. COEP: credentialless for SharedArrayBuffer isolation.
The browser sandbox provides bounds-checked memory access. No buffer overflows possible. Memory is garbage-collected when the processing tab closes.
Processing modules and critical scripts loaded with integrity verification. Prevents CDN compromise from injecting malicious code.
File processing generates zero network requests. Verifiable via browser DevTools Network tab during any file operation.
Our security claims are independently verifiable. You don't have to trust us — you can prove it.
Open Network tab → process any file → observe zero outbound data transfers. Private & secure architecture.
Run ssllabs.com/ssltest against mioffice.ai. We score A+ with TLS 1.3 and strong configuration.
Run securityheaders.com against mioffice.ai. We score A with all recommended headers (CSP intentionally omitted for browser engine compatibility).
Run observatory.mozilla.org against mioffice.ai. B+ score with detailed analysis of our HTTP security configuration.
We welcome responsible disclosure from security researchers.