Skip to content

massCodeBoost your productivity

Free, open-source snippet manager for developers. Create, organize, and quickly access your personal code collection.

massCode
Organization
Organize your snippets with multi-level folders and tags. Each snippet can contain multiple fragments (tabs), giving you fine-grained control over structure and grouping.
Editor
Built on CodeMirror with .tmLanguage grammars for syntax highlighting.
  • Supports over 600 grammars , with 160+ available out of the box.
  • Integrated Prettier for clean, consistent code formatting.
Real-time HTML & CSS Preview
Write and instantly preview HTML and CSS snippets. Perfect for prototyping, testing ideas, or quick visual checks.
Markdown
Full Markdown support with syntax highlighting, tables, lists, and more.
  • Integrated Mermaid for dynamic diagrams and charts.
Presentation Mode
Turn a sequence of snippets into a presentation. Useful for classrooms, team meetings, conference talks, or simply walking through your own notes.
Mindmap
Generate mind maps from Markdown. Fast, intuitive, and ideal for structuring and visualizing ideas.
Developer Tools
Handy built-in utilities for everyday dev tasks:
  • Text Tools: Case Converter, Slug Generator, URL Parser
  • Crypto & Security: Hash/HMAC, Password Generator, UUID
  • Encoders/Decoders: URL, Base64, JSON ⇄ TOML/XML/YAML, Text ⇄ ASCII/Binary/Unicode, Color Converter
JSON Visualizer
Visualize and explore your JSON data with an interactive graph view. Perfect for quickly inspecting complex responses, APIs, or configuration files.
Integrations
Extend your workflow with:
Beautiful Screenshots
Export snippets as polished images with customizable themes and backgrounds.
Localization
massCode is available in Čeština, Deutsch, Ελληνικά, English, Español, French, 日本語, Português (Brasil), Română, Русский, Türkçe, Українська, 中文 (简体), 中文 (繁體) & 中文 (繁體 香港特別行政區) languages.

massCode released under the AGPL v3 License.
Snippet collection released under the CC-BY-4.0 License.