Codebase Context Packer

Model:
Budget:tokens
Format:
Raw: 0After truncation: 0Budget: 128,000
00% used128,000

Files (0)

No files added yet

Add files individually or use Bulk Paste with --- filename --- markers

Output Preview

Add files and click Pack Context to generate output

What This Tool Does

Codebase Context Packer is built for deterministic developer and agent workflows.

Pack code files into optimized LLM context with smart truncation, token budgeting, and multiple output formats. All processing in your browser.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/codebase-context-packer/

For automation planning, fetch the canonical contract at /api/tool/codebase-context-packer.json.

How to Use Codebase Context Packer

  1. 1

    Add your code files

    Click Add File for each file you want to include. Enter the file path and paste the contents. You can also use bulk paste mode with file separators.

  2. 2

    Set your token budget

    Enter your target token budget or select a model preset (Claude 200K, GPT-4o 128K, Gemini 1M). The budget bar shows how much space your files use.

  3. 3

    Choose truncation mode

    For large files, switch from Full to Signatures Only (keeps function and class signatures, drops bodies) or First N Lines to fit within your budget.

  4. 4

    Copy the packed output

    Select your output format (XML for Claude, Markdown, or Plain), review the preview, and click Copy to get the optimized context package ready to paste.

Frequently Asked Questions

What is Codebase Context Packer?
Codebase Context Packer helps you assemble code files into an optimized context package for LLMs. It includes token budgeting, smart truncation (full, signatures-only, first-N lines), and multiple output formats.
What output formats are available?
Three formats: XML-wrapped (ideal for Claude), markdown fenced code blocks, and plain text with file separators. All formats include file paths for context.
Is Codebase Context Packer free?
Yes. Completely free with no account or sign-up required.
Does it send my code to a server?
No. All processing happens entirely in your browser. Your code files never leave your device.
How does the signatures-only truncation work?
Signatures-only mode keeps function and class declarations but removes implementation bodies, dramatically reducing token count while preserving the API surface that LLMs need for context.