Free utilities

In-Browser Tools

These small utilities run entirely in your browser — nothing you type is sent to any server. They are simple educational helpers, not production-grade services.

Estimator

Token & Word Counter

Paste text to see character and word counts plus a rough token estimate (≈4 characters per token for English). Useful for getting a feel for context-window sizes.

Builder

Prompt Builder

Structure a prompt using the role / task / context / format pattern — a simple template that often improves LLM responses.

Formatter

JSON Formatter

Pretty-print and validate JSON — handy when working with model API payloads and structured outputs.

Reference

Prompting Cheat Sheet

Quick techniques that commonly improve results with language models:

  • Be specific: state the audience, length, and format you want.
  • Give examples: one or two samples (few-shot) anchor style and structure.
  • Ask for reasoning: request step-by-step thinking for complex problems.
  • Iterate: treat the first answer as a draft and refine with follow-ups.
  • Verify: check facts, citations, and code before relying on them.