Free · No sign-up · Runs in your browser

File tools that never see your files.

Resize passport photos, compress images, format JSON and more. Everything runs on your device, so your files are never uploaded to a server.

No uploadsNo accountOpen to inspection

Drop a file here

Photos, PDFs, text or JSON. You can also paste from your clipboard.

Or try a tool:
Quick Presets · One-Click WorkflowsClick any preset—or drop a file directly onto it—to process your file immediately. You can save your own presets inside any tool.
All tools

Pick a tool. Add a file. Download.

Every tool works the same way, so once you have used one you know them all.

How it works

Three steps, and none of them upload anything.

STEP 1

Add a file

Drop it on the page, choose it from your computer, or paste text. It opens inside this browser tab.

STEP 2

Adjust the settings

See a live preview as you change size, quality or format. Basic settings first, Advanced when you want control.

STEP 3

Download the result

Check the before and after, then save the file. Delete it from the tab with one click when you are done.

Why your files stay private

Each tool runs inside your browser tab, using your own computer. Our servers only send you the page. They never receive your file, because there is nowhere in the page to send it. While a tool works you will see a paper envelope close over your file. That is our way of showing that it stays sealed in your tab.

Your browser tabyour fileOur serversnever receiveyour files
Check it yourself

Do not take our word for it.

Process something above, then look at these numbers. They are measured in this tab.

0

Network requests while processing

Counted from the browser's own request log around every run. It should stay at zero.

Hashing…

Fingerprint of this page's code

A live SHA-256 digest of the runtime code executing in this tab, verified alongside our WebAssembly module hashes.

connect-src 'self'

Blocked by the site's own rules

Enforced by a strict Content-Security-Policy header that blocks the page from contacting any external server.

Try it: open your browser's developer tools, switch to the Network tab, then process a file. You will see no upload. You can also switch off your internet connection first. The tool still works.
For developers and AI agents

The same tools, callable by code.

Every tool is described by one manifest. The page builds its settings from it, and AI agents (Claude, ChatGPT, Cursor) call the same tool through the Model Context Protocol. The same input always gives the same output, whether a person clicked or an agent called.

MCPJSON schemaSame result as the website
TECHNICAL SPECIFICATION & USER GUIDE · SECURITY & CRYPTO
How Cifrador de Archivos de Conocimiento Cero (Sobre HTML Autodescifrable) Works Locally in Your Browser
Available in:EnglishالعربيةDeutschEspañolFrançaisहिन्दीBahasa IndonesiaItaliano日本語한국어NederlandsPolskiPortuguêsРусскийTürkçeTiếng Việt简体中文
Direct Answer Summary (Optimized for Search & AI Citations)
El cifrador de conocimiento cero de PrivacyFold utiliza la API WebCrypto para empaquetar archivos en documentos HTML autodescifrables protegidos con AES-256-GCM. El cifrado y descifrado se realizan completamente fuera de línea sin transmitir contraseñas a ningún servidor.
Technical Privacy Guarantee:Your file is processed 100% locally in your browser memory and is never uploaded. This page contains advertisements served by Google AdSense to sustain free operation without accounts or subscriptions.
Share Privately:(0 trackers · plain links)
Al compartir documentos financieros, declaraciones de impuestos o contratos confidenciales, los servicios tradicionales de almacenamiento en la nube guardan sus archivos sin cifrar o conservan las claves maestras. El cifrador de PrivacyFold utiliza cifrado militar AES-256-GCM con derivación de claves PBKDF2 (600.000 iteraciones SHA-256) directamente en el navegador a través de la API WebCrypto. Su archivo se empaqueta en un sobre HTML autodescifrable que cualquier persona con la contraseña puede abrir en cualquier navegador sin instalar aplicaciones ni requerir conexión a internet.
Step-by-Step Instructions
  1. Seleccione cualquier archivo confidencial (PDF, imagen, zip o documento).
  2. Introduzca una contraseña segura.
  3. Haga clic en Cifrar para generar el paquete.
  4. Descargue el sobre HTML autodescifrable y envíelo a su destinatario.
What to Expect & Performance Benchmarks
Un sobre HTML independiente, portátil y autodescifrable.
Execution Latency: Cifrado acelerado por hardware: 50 MB procesados en menos de 400 ms.
Supported Limits: Admite archivos de hasta 250 MB dentro del navegador.
Privacy Verification & Technical Guarantee
Todo el cálculo criptográfico se ejecuta mediante window.crypto.subtle directamente en su máquina local.
  1. Active el Modo Avión en su dispositivo.
  2. Cifre el archivo y descargue el sobre HTML.
  3. Abra el archivo HTML sin conexión e ingrese su contraseña para verificar el descifrado.
Sin puertas traseras, código criptográfico totalmente transparente y auditable.
Architecture & Standards Comparison
AttributePrivacyFold Local EngineTraditional Online Converters
Execution Runtimefile-encrypt-v1.wasm (In-Browser RAM)Remote Cloud Server Buckets
Standard ComplianceNIST SP 800-38D (AES-GCM) / RFC 8018 (PBKDF2)Opaque Server Scripts
Network Footprint0 KB uploaded (Client-Side Only)Full File Upload Over Internet
Offline Support100% Functional via Service Worker PWAFails Without Active Server Connection
Agent IntegrationDeterministic JSON-RPC / MCP Tool SchemaAd-Hoc REST Upload Form
Frequently Asked Questions
¿Cómo descifra el destinatario el archivo si no tiene PrivacyFold instalado?
El archivo generado es un documento HTML estándar. El destinatario solo debe hacer doble clic en él en cualquier navegador (Chrome, Safari, Edge, Firefox), ingresar la contraseña y el navegador descifrará y guardará el archivo original automáticamente.
¿Puede PrivacyFold recuperar mi archivo si olvido la contraseña?
No. Se trata de una arquitectura estricta de conocimiento cero. Su contraseña nunca se envía a ningún servidor. Si la pierde, los datos cifrados son matemáticamente irrecuperables.