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Merge, split, compress, convert, and edit PDFs instantly. All processing happens in your browser – your files never leave your device.
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Most Popular PDF Tools
Quick access to our most-used features. All tools are completely free with no limits.
Combinar PDF
Combina múltiples archivos PDF en un solo documento. Combina...
Dividir PDF
Divide archivos PDF en múltiples documentos. Extrae páginas ...
Compress PDF
Reduce PDF file size online. Compress PDF documents while ma...
Editar PDF
Edita archivos PDF en línea. Añade texto, imágenes, anotacio...
JPG a PDF
Convierte imágenes JPG a PDF. Combina múltiples JPG en un do...
PDF a JPG
Convierte páginas PDF a imágenes JPG de alta calidad....
Firmar PDF
Añade firmas electrónicas a documentos PDF. Dibuja, escribe ...
Cifrar PDF
Protege documentos PDF con contraseña y cifrado....
PDF Workflow Builder
Automate your PDF tasks by chaining multiple actions together. Create custom workflows that merge, compress, convert, and organize your documents in one go.
- Drag & Drop – Visually build your workflow with an intuitive editor
- Chain Actions – Combine merge, split, compress, convert in sequence
- Save Time – Process multiple files with a single click
110 Actions
Available in workflows
How It Works
Complete privacy. Zero uploads. Everything happens right in your browser.
Choose a Tool
Select from 110 professional PDF tools. Merge, split, convert, compress, and more.
Add Your Files
Drag and drop your PDFs. Files are processed locally in your browser for complete privacy.
Download Result
Get your processed PDF instantly. No waiting, no account required.
Why Choose pdftheory?
Trusted by millions of users worldwide for secure, fast, and reliable PDF processing.
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
No server uploads. Instant results without waiting in queues.
No Account Needed
Start using immediately. No sign-up, no email verification required.
Works Everywhere
Use on any device with a modern browser. Desktop, tablet, or mobile.