NoteArmor — Secured Notepad Pro (Free Edition)

Military-grade encryption meets modern note-taking.
A privacy-first, offline encrypted text editor built for professionals, developers, and privacy advocates.

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Overview

NoteArmor is an enterprise-grade encrypted text editor that keeps your notes safe without cloud dependency. Every file you protect is encrypted locally using AES-128 via Fernet with PBKDF2-HMAC-SHA256 key derivation — no data ever leaves your machine.

This is the Free / Personal Use Edition. It is fully functional for individual, non-commercial use.

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Features

Feature	Details
Encrypted Save	Password-protected .notearmor files using Fernet + PBKDF2
Plaintext Save	Standard .txt files with UTF-8 encoding
Multi-Tab Editing	Open and manage multiple notes simultaneously
Autosave	Automatic save every 60 seconds for modified files
Line Numbers	Built-in line number gutter with current-line highlight
Zoom Control	Ctrl++ / Ctrl+- / Ctrl+R, plus Ctrl+Wheel
Status Bar	Live Ln/Col position, encryption status, zoom level
Professional Blue Theme	Custom QSS theme, ships bundled via Qt resources
Offline-First	Zero network calls, zero telemetry, fully air-gap safe

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Encryption Specification

Algorithm       : Fernet (AES-128-CBC + HMAC-SHA256)
Key Derivation  : PBKDF2-HMAC-SHA256
KDF Iterations  : 100,000
Salt            : 16 bytes, cryptographically random (os.urandom)
File Format v3  : [16B salt][4B meta_len][JSON metadata][Fernet token]
File Extension  : .notearmor

⚠️ Password Warning: There is no password recovery mechanism. A lost password means permanently lost data. Store your password securely.

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Screenshots

Main Editor	Encrypted Save	Help

About	Donate	Terms & License

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Requirements

• OS: Windows 10/11 (x64)
• Python: 3.12 (if running from source)
• Dependencies: see requirements.txt

PySide6>=6.5.0,<7.0
cryptography>=41.0.0

pyotp, psutil, pytesseract, Pillow, reportlab, and nuitka are included in requirements.txt for the Pro build pipeline. They are not required to run the Free Edition from source.

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Installation (From Source)

# 1. Clone the repository
git clone https://github.com/j3fcruz/Secured-Notepad.git
cd Secured-Notepad

# 2. Create a virtual environment
python -m venv venv
venv\Scripts\activate      # Windows
# source venv/bin/activate # Linux/macOS

# 3. Install dependencies/requirements
pip install PySide6>=6.5.0 cryptography>=41.0.0

or

pip install -r requirements.txt

# 4. Run
python main.py

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Project Structure

NoteArmor/
├── main.py                    # Entry point — logging, QApplication bootstrap
├── requirements.txt
│
├── config/
│   └── app_config.py          # App metadata, paths, constants (no .env)
│
├── core/
│   └── encryption.pyd         # Compiled encryption module (Nuitka — Windows x64)
│
├── ui/
│   └── notearmor_free.py      # Main window (QMainWindow) — tabs, menus, file I/O
│
├── dialogs/
│   ├── about_dialog.py        # About (app info + license text)
│   ├── help_dialog.py         # Help (quick start, shortcuts, troubleshooting)
│   ├── password_entry_dialog.py
│   ├── save_dialog.py         # Save mode selector (plaintext vs encrypted)
│   └── terms_conditions_dialog.py
│
├── utils/
│   ├── editor.py              # EnhancedTextEditor — line numbers, zoom, highlight
│   ├── advanced_features.py   # Syntax highlighting, recent files (Pro carry-over)
│   ├── file_handler.py        # FileHandler class (legacy path — not used by Free UI)
│   ├── tab_manager.py         # TabManager class (legacy path — not used by Free UI)
│   ├── logger.py              # Logger class (structured file + console logging)
│   ├── icon_manager.py        # Qt resource icon loader
│   ├── theme_manager.py       # QSS theme loader
│   ├── status_manager.py      # Status bar helper
│   └── _path_utils.py         # PathResolver — frozen/dev path resolution
│
├── resources/
│   ├── icons_rc.py            # Qt compiled icon resources
│   ├── themes_rc.py           # Qt compiled theme (QSS) resources
│   └── screenshots_rc.py      # Qt compiled screenshot resources
│
└── assets/
    └── icons/
        └── notearmor.ico

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Keyboard Shortcuts

Action	Shortcut
New Tab	Ctrl+N
Open File	Ctrl+O
Save	Ctrl+S
Save As	Ctrl+Shift+S
Undo	Ctrl+Z
Redo	Ctrl+Y
Cut / Copy / Paste	Ctrl+X / Ctrl+C / Ctrl+V
Zoom In / Out	Ctrl++ / Ctrl+-
Reset Zoom	Ctrl+R
Help	F1
Exit	Ctrl+Q

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Security Notes

• Passwords are held in-memory only within the tab_files dict for the session.
• No password is written to disk, logs, or any external store.
• The autosave routine skips encrypted tabs — only plaintext files are autosaved automatically.
• Log output is written to notearmor.log at WARNING level in production builds.
• The core/encryption.pyd binary is a Nuitka-compiled Windows DLL. Source code is not included in this repository.

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Known Limitations (Free Edition)

• Single theme only (Professional Blue). Theme switching available in Pro.
• No keyfile support. Password-only encryption.
• No search & replace UI (module present but not wired to menu).
• Syntax highlighting available in code but not connected to Free Edition UI.
• Tab index key (tab_files dict) can desync if tabs are closed out-of-order — handle with care when modifying.

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Support & Donation

NoteArmor is free for personal use. If it saves your data or your sanity, consider supporting development:

• 🌐 Website: patronhubdevs.com
• ☕ Ko-fi: ko-fi.com/marcopolo55681
• 💸 PayPal: paypal.me/jofreydelacruz13

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License

NoteArmor Personal Use and Non-Commercial License (PU-NC) v1.0
Copyright © 2025 PatronHubDevs Technologies. All rights reserved.

See LICENSE for full terms.

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Built with ❤️ by Marco Polo / PatronHubDevs Technologies