Plain PDF tools. Nothing uploaded.
Offline PDF tools that run entirely in your browser.
No uploads. No servers. No accounts. Just simple, professional PDF utilities powered by your device.
Drag and drop your PDFs
or select files to get started
100% Client-Side
All processing happens locally in your browser
No Uploads
Files are never sent to any server
Verifiable
You can confirm this yourself in DevTools or offline mode
Available Tools
Compress PDF
SoonReduce file size whilst maintaining quality
Reorder Pages
SoonRearrange pages in your PDF document
Extract Pages
SoonPull specific pages from a PDF
Rotate PDF
SoonRotate pages to the correct orientation
Privacy by Architecture, Not Just Policy.
Traditional PDF utilities require you to ‘trust’ their server-side encryption. At Plain, we removed the server entirely. Your documents never leave your local machine because our processing engine lives within your browser. This isn't just a promise; it is a technical impossibility for us to see your data.
WebAssembly Engine
We compile professional-grade PDF libraries into Wasm. This allows your browser to execute complex document manipulation at near-native speeds without an internet connection.
// Wasm initialisation
const pdfEngine = await WebAssembly
.instantiateStreaming(
fetch('/pdf-core.wasm'),
{ env: wasmImports }
);
// Processing happens locally
engine.processDocument(buffer);On-Device AI (WebGPU)
Our AI summarisation and chat features utilise your device's hardware. By leveraging WebGPU, large language models run directly in your browser's memory, ensuring your prompts and private data are never sent to a third-party API.
// WebGPU model inference
const adapter = await navigator.gpu
.requestAdapter();
const device = await adapter
.requestDevice();
// LLM runs in browser memory
await localLLM.generate(prompt);Zero-Trace Environment
Plain uses a 'volatile' processing method. Once you close the tab, the virtual workspace is wiped. No temporary files, no cache leftovers, and absolutely no tracking cookies.
// Volatile memory handling
window.addEventListener(
'beforeunload',
() => {
memoryBuffer.fill(0);
workspace.destroy();
// No trace remains
}
);COMPLIANCE-READY FOR GDPR, UK GDPR & ENTERPRISE ENVIRONMENTS
How Plain Works
Open a tool
Choose what you want to do. No setup required.
Select your files
Files stay on your device at all times.
Download the result
Your processed PDF is generated locally in your browser.
Plain uses modern browser technologies (WebAssembly) to perform PDF processing locally.
Privacy by Design
- No file uploads
- No user accounts
- No analytics trackers
- No cookies required
- No server-side processing
If it can't be verified, it doesn't belong here.
Offline PDF Tools You Can Trust
Plain provides offline PDF tools that work entirely in your browser. Unlike traditional PDF utilities that require uploading sensitive documents to external servers, Plain processes files locally using modern browser technology. This makes it ideal for confidential documents, workplace use, and privacy-conscious users. Whether you need to merge PDF without upload, use client-side PDF tools for sensitive data, or simply want private PDF utilities you can trust, Plain delivers a professional solution without compromises.
Technical FAQ
Common questions about our privacy-first architecture
Plain utilises WebAssembly (Wasm) to run professional-grade PDF engines directly in your browser's sandbox. Your files stay in your device's memory and are never transmitted to any external server.
Since processing happens on your device, the limit is determined by your system's available RAM. Most modern browsers comfortably handle files up to 500MB.
No. We use WebLLM and WebGPU technologies to execute large language models locally on your machine. Your prompts and document content remain strictly private.
Plain is optimised for the latest versions of Chrome, Edge, and Safari. For AI-driven features, a browser with WebGPU support is required for the best experience.
Yes. Once the initial application is loaded, the core PDF tools and AI models function entirely without an active internet connection.
Technology Stack
All processing occurs within your browser environment. No data is transmitted externally.