Your Files. Your Device. Your Privacy.
Most MiOffice apps process files right in your browser — they never leave your device. For AI-powered apps, files are sent over an encrypted connection to secure GPU servers and deleted immediately after processing.
How We Protect Your Files
Client-Side Apps
PDF, image, video, and document apps process files entirely in your browser. Nothing is uploaded. No server ever touches your files.
Verify it: Open DevTools → Network tab → no file data leaves your browser.
AI-Powered Apps
Apps like background removal, upscaling, and video translation require GPU processing. Files are sent over an encrypted connection, processed in an isolated container, and deleted immediately after.
No copies are kept. No human ever sees your files. Auto-deleted within 60 minutes max.
Security Measures
Always Encrypted
All connections use the latest TLS 1.3 encryption. HSTS preload is enabled, which means your browser will only ever connect to MiOffice over HTTPS. There is no way to access the site without encryption.
Browser Sandbox
Client-side processing runs in an isolated sandbox inside your browser. It cannot access your files, your system, or other browser tabs. The processing code itself is sandboxed and has no way to reach anything outside its container.
Secure Authentication
Accounts are optional. When you sign in, you use Google, Apple, GitHub, or other trusted providers. We never see or store your password. Authentication is powered by Logto, an industry-standard identity platform.
Payment Security
All payments are processed by Stripe, the world's most trusted payment platform. Your card number never touches our servers. Stripe holds PCI DSS Level 1 certification — the highest level of payment security.
Email Security
All emails are sent from our own mail server with S/MIME signing, SPF, DKIM, and DMARC protections. This prevents spoofing and ensures every email you receive from MiOffice is authentic.
GPU Processing Security
AI apps run in temporary, isolated containers on GPU servers. Each job gets its own container that is destroyed after processing. There is no persistent storage — files are auto-deleted within 60 minutes maximum. No human ever accesses your files during processing.
Security Headers
Every page on MiOffice includes these security headers to protect against common web attacks:
| Header | What It Does |
|---|---|
| Strict-Transport-Security | Forces all connections to use HTTPS. Your browser will never use an unencrypted connection to MiOffice. |
| X-Content-Type-Options | Prevents the browser from guessing file types, which blocks a category of injection attacks. |
| X-Frame-Options | Prevents other websites from embedding MiOffice in a hidden frame to trick you into clicking things. |
| Referrer-Policy | Controls what information is shared when you click a link that leaves MiOffice. Only the origin is shared, not the full URL. |
| Cross-Origin-Opener-Policy | Isolates MiOffice from other browser tabs so they cannot interfere with your session. |
| Cross-Origin-Embedder-Policy | Ensures all loaded resources are explicitly allowed, preventing unauthorized scripts or data from running. |
How We Compare
Most file apps upload everything to their servers. Here is how MiOffice stacks up:
| Threat | MiOffice | Server-Based Apps |
|---|---|---|
| File interception during transfer | No transfer for most apps; encrypted for AI | Risk during upload/download |
| Server-side data breach | No server storage; AI files auto-deleted | Files stored temporarily or indefinitely |
| Insider access to your files | No human access; AI containers are automated | Employees may have access |
| Third-party data sharing | Files never shared with third parties | Subprocessors may access files |
| Government data request | No stored files to provide | May be compelled to hand over data |
| Account credential theft | Optional accounts, no passwords stored | Password reuse and phishing risk |
Verified Security
Independent security scans confirm our security posture:
Verify It Yourself
SSL Labs
Test our encryption and certificate setup at ssllabs.com/ssltest
Security Headers
Check our HTTP security headers at securityheaders.com
Browser DevTools
Open the Network tab while using any client-side app — confirm zero file data leaves your browser.
Mozilla Observatory
Run a full security scan at observatory.mozilla.org for an independent assessment.
The safest way to work with files online
Private, secure, and ready to use. No signup required for most apps.