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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
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Most Popular PDF Tools
Quick access to our most-used features. All tools are completely free with no limits.
PDF結合
複数のPDFファイルを1つのドキュメントに結合。ドラッグ＆ドロップで並べ替え可能な無料オンラインPDF結合ツール。...
PDF分割
PDFファイルを複数のドキュメントに分割。特定のページを抽出またはページ範囲で分割。...
PDF圧縮
品質を維持しながらPDFファイルサイズを削減。小さなファイルのための無料オンラインPDF圧縮ツール。...
PDF編集
オンラインでPDFファイルを編集。テキスト、画像、注釈、ハイライト、図形をドキュメントに追加。...
JPGからPDF
JPG画像をPDFに変換。複数のJPGファイルを1つのPDFドキュメントに結合。...
PDFからJPG
PDFページをJPG画像に変換。カスタマイズ可能な解像度で高品質抽出。...
PDF署名
PDFドキュメントに電子署名を追加。描画、入力、または署名をアップロード。...
PDF暗号化
PDFファイルをパスワード保護。暗号化を追加し、権限を設定。...
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.