JamPack

JamPack is a lightweight macOS utility that merges any number of code files into a single .txt file — ideal for feeding large projects into AI assistants like ChatGPT, Claude, Gemini, or archiving cleanly.

🔗 Click to download

✅ 100+ Users have downloaded JamPack
According to Google Analytics, JamPack has already helped over a hundred users streamline multi-file workflows for AI tools.

---

🚀 Why JamPack?

AI models like GPT-4, Claude 3, and Gemini 1.5 have context windows, file limits, and upload caps:

• ChatGPT allows up to 10 files per upload and caps each text file at 2 M tokens¹
• Claude lets you attach 20 files per chat and still has a 200 K-token window²³
• Even “long-context” models such as Gemini 1.5 (1-2 M tokens)⁴ or GPT-4o (128 K tokens)⁵ can choke on large multi-file projects.
JamPack flattens your project into a single, well-labeled text file, keeping filenames as in-file headers so the AI understands each part.

JamPack solves this. It flattens your project into one .txt file while preserving:

• File structure
• File names as readable headers
• Language identity

So AI can still understand what's what — with zero confusion.

---

✨ Features

• Drag & Drop multiple source files
• Reorder files with simple drag handles
• Exclude unwanted files individually
• One-click export to a .txt file (named automatically)
• Streaming-based merge system Efficient even with hundreds or thousands of files
• Handles large content (gigabyte-scale) with minimal memory
• Output file is auto-copied to clipboard
• Choose save location (default: Downloads folder)
• Instant folder opening after merge
• Rejects unsupported file types (e.g., images, binaries)

---

⚙️ How It Works (Tech Details)

JamPack uses a streaming I/O model under the hood:

• Instead of reading all files into memory at once, it uses FileHandle to process each file in chunks (32KB at a time).
• This chunked reading and writing prevents memory crashes on large merges.
• Files are prefixed and suffixed with Markdown-style code blocks (```filename) for readability.
• The final merged .txt is stored efficiently and copied to your clipboard.
• You can also automatically open the save folder after export.

This makes JamPack ideal for merging:

• Large repositories
• Notebook exports
• Educational codebases
• Long chat history logs

---

📄 Supported Languages

JamPack supports virtually all common code formats:

HTML, CSS, JavaScript, TypeScript, Python, Swift, Java, C, C++, C#, Go, Rust, PHP, Ruby, Kotlin, Lua, SQL, Perl, Scala, Sass, Vue, and more.

⚠️ Unsupported files like images, videos, or binaries are safely rejected.

---

💾 Installation

1. Download JamPack.dmg
2. Open the .dmg
3. Drag JamPack into your Applications folder
4. Launch from Launchpad or Spotlight

---

🖥 Requirements

• macOS 12 (Monterey) or later

---

📜 License

MIT

---

Footnotes

1. OpenAI Help Center – “File uploads FAQ”
   https://help.openai.com/en/articles/8555545-file-uploads-faq ↩

2. Anthropic Help Center – “What kinds of documents can I upload to Claude.ai?”
   https://support.anthropic.com/en/articles/8241126-what-kinds-of-documents-can-i-upload-to-claude-ai ↩

3. Anthropic Help Center – “Maximum prompt length”
   https://support.anthropic.com/en/articles/7996856-what-is-the-maximum-prompt-length ↩

4. Google AI Developers – “Long context”
   https://ai.google.dev/gemini-api/docs/long-context ↩

5. OpenAI API Docs – “GPT-4o” model card
   https://platform.openai.com/docs/models/gpt-4o ↩