# PDF Toolkit

> PDF Toolkit is a 100% local, offline PDF toolkit for macOS and Windows (version 2.0.0): compress, resize pages, redact, edit metadata, merge, split, convert (PDF to JPG/PNG), extract images, encrypt (256-bit AES), sign with handwritten or PAdES digital signatures, add page numbers, and watermark PDFs. All processing happens on the user's device — files are never uploaded to any server.

Key facts:

- Developer: Lee Kwok Po (independent developer)
- Platforms: macOS 10.15+ (Mac App Store) and Windows 10/11 (Microsoft Store)
- Version: 2.0.0 — adds Redaction, Resize Pages, and Metadata Editing, plus upgraded compression (custom 1-99% ratio, CMYK color-safe output) and PAdES digital signatures
- Business model: 7-day full-feature free trial, then a one-time purchase (not a subscription); purchases are restored via the user's Apple ID (macOS) or Microsoft account (Windows)
- Privacy: fully offline processing, zero telemetry, no data collection; suitable for confidential contracts, financial reports, and medical records
- Interface languages: Traditional Chinese, Simplified Chinese, English, Japanese, Korean (auto-selected on first launch, bundled CJK fonts)
- Category: utilities / productivity (PDF editing and document management)

Features:

- Merge multiple PDF/JPG/PNG files into one document, or split a PDF by page range or page count
- Manage pages visually: reorder, insert, delete, with thumbnail zoom, list view, sorting, and shortcut undo
- Resize pages to A2/A3/A4/A5 or a custom size (mm/inch), portrait or landscape, keeping layout, links, and bookmarks
- Compress PDFs with four levels (light, recommended, high, extreme) and a custom 1-99% ratio; CMYK print files keep their colors and PDF/X settings
- Convert PDF to JPG or PNG in high quality
- Extract embedded images at original quality
- Encrypt PDFs with AES-256 open-password protection, and open already encrypted PDFs
- Handwritten, text, and image electronic signatures, with custom font upload
- PAdES digital signatures with certificate files (.p12, .pfx) or PKCS#11 smart cards, including timestamps, long-term validation, and archive timestamps; on-device signature verification
- Insert page numbers with configurable range, style, and alignment; styles follow the interface language
- Add text or image watermarks (automatic image background removal) with tamper-evident digital signing
- Redaction that permanently removes marked text, images, and vector content so it cannot be recovered
- View and edit eight metadata fields (title, author, subject, keywords, creator, producer, creation and modification dates), with batch apply and ZIP export; every tool also offers a "Remove metadata" output option

Frequently asked questions:

- Q: Does PDF Toolkit upload my files to a server? A: No. All features run 100% locally and work completely offline, including encryption, redaction, and PAdES signing.
- Q: Which interface languages are supported? A: Five — Traditional Chinese, Simplified Chinese, English, Japanese, and Korean; the app selects the system language on first launch and can be changed in Settings.
- Q: Can redacted content be recovered? A: No. Redaction removes the marked text, images, and vector content from the file itself, so it cannot be recovered, copied, or searched.
- Q: Is PDF Toolkit available for both macOS and Windows? A: Yes — on the Mac App Store (macOS) and the Microsoft Store (Windows).
- Q: How do I restore a purchase? A: Open the Settings or Store page inside the app and select Restore Purchase; authorization uses your Apple ID (macOS) or Microsoft account (Windows).
- Q: Does compressing a PDF reduce its quality? A: Light and Recommended keep the original text and image resolution with almost no visible change; High and Extreme resample images for email attachments and strict upload limits. A custom 1-99% ratio is also available.
- Q: Can a forgotten PDF password be recovered? A: No. AES-256 encryption never stores, sends, or backs up the password, so neither the app nor the developer can restore it; keep passwords in a password manager.
- Q: Can the text inside a PDF be edited? A: No - PDF Toolkit works at page and file level (merge, split, compress, convert, encrypt, redact, sign, page numbers, watermarks, metadata). Edit the source document and export a new PDF instead.

中文摘要：

- PDF Toolkit 是 100% 本地離線的 PDF 工具箱（macOS／Windows），支援 PDF 壓縮、合併、分割、轉換、加密與簽章，並具備標記密文、調整頁面大小與編輯元數據功能。
- 支援繁體中文、簡體中文、英文、日文、韓文五種介面，首次啟動依系統語言自動選擇，內建中日韓字型。
- 所有功能皆在使用者裝置上完成，不上傳任何檔案、不含遙測；適合合約、財務報表、醫療紀錄等敏感文件。
- 官方下載管道：Mac App Store 與 Microsoft Store（連結見下方）。

日本語要約：

- PDF Toolkit は macOS／Windows 向けの 100% ローカル・オフライン PDF ツールです。圧縮・結合・分割・変換・暗号化・電子署名に加え、墨消し、ページサイズ変更、メタデータ編集に対応しています。
- 日本語・韓国語・英語・簡体字中国語・繁体字中国語の5言語 UI に対応し、初回起動時にシステム言語を自動選択。CJK フォントを内蔵しています。
- すべての処理は端末上で完結し、ファイルのアップロードやテレメトリは一切ありません。

한국어 요약:

- PDF Toolkit은 macOS／Windows용 100% 로컬 오프라인 PDF 도구입니다. 압축·병합·분할·변환·암호화·전자 서명에 더해 교정, 페이지 크기 조정, 메타데이터 편집을 지원합니다.
- 한국어, 일본어, 영어, 중국어 간체·번체 5개 언어 UI를 지원하며 첫 실행 시 시스템 언어를 자동 선택하고 CJK 글꼴을 내장합니다.
- 모든 처리는 사용자 기기에서 완료되며 파일 업로드나 텔레메트리가 없습니다.

## Official pages

- [PDF Toolkit official website](https://www.pdftoolkitdev.app/): Features, security details, app screenshots, FAQ, and support information.
- [PDF Toolkit on the Mac App Store](https://apps.apple.com/us/app/pdf-toolkit/id6766606474?mt=12): The official macOS version of PDF Toolkit.
- [PDF Toolkit on the Microsoft Store](https://apps.microsoft.com/detail/9ns4fkqn1qhk?hl=en-us&gl=US&cid=DevShareMCLPCS): The official Windows version of PDF Toolkit.

## Support and policies

- [Support center](https://dolomite-arthropod-f4a.notion.site/PDF-Toolkit-Support-Info-36c5f43ff56280e18f56f14dc1589cf2): Contact and troubleshooting information.
- [Privacy policy](https://dolomite-arthropod-f4a.notion.site/PDF-Toolkit-Privacy-Policy-36c5f43ff56280189c5af55723b5c9a3): How PDF Toolkit handles (and never collects) user data.

## Optional

- [Microsoft Store (繁體中文)](https://apps.microsoft.com/detail/9ns4fkqn1qhk?cid=DevShareMCLPCS&hl=zh-TW&gl=HK): Localized Traditional Chinese store listing for the Windows version.