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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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Files stay local
Lightning Fast
No uploads needed
Most Popular PDF Tools
Quick access to our most-used features. All tools are completely free with no limits.
PDF zusammenfügen
Kombinieren Sie mehrere PDF-Dateien zu einem Dokument. Koste...
PDF teilen
PDF-Dateien in mehrere Dokumente aufteilen. Extrahieren Sie ...
PDF komprimieren
PDF-Dateigröße reduzieren bei gleichbleibender Qualität. Onl...
PDF bearbeiten
PDF-Dateien online bearbeiten. Text, Bilder, Anmerkungen und...
JPG in PDF
Konvertieren Sie JPG-Bilder in PDF. Mehrere JPG-Dateien zu e...
PDF in JPG
Konvertieren Sie PDF-Seiten in JPG-Bilder. Hochwertige Extra...
PDF unterschreiben
Elektronische Unterschriften zu PDF-Dokumenten hinzufügen. Z...
PDF verschlüsseln
PDF mit Passwort schützen. Fügen Sie Verschlüsselung hinzu u...
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.