Developer Utilities
A curated suite of privacy-first, client-side tools designed specifically for AI developers, prompt engineers, and creators. No signup required.
Instantly count tokens for OpenAI, Anthropic, and open-source models, and estimate API costs.
Format, validate, and beautify messy JSON payloads, specifically tuned for fixing LLM outputs.
Instantly structure your prompts with XML tags optimized for Claude and Anthropic models.
A fast, privacy-first Base64 encoder and decoder. Your data never leaves your browser.
Check exact context limits for GPT-4, Claude 3, Llama 3, and hundreds of OpenRouter models dynamically.
Instantly decode, verify, and format JSON Web Tokens (JWT). Inspect header, payload claims, and signatures securely.
Build, test, and debug regular expressions in real-time. Features live match highlighting and capture group extraction.
Write, preview, and convert Markdown to HTML in real-time. Features GitHub Flavored Markdown (GFM) and raw HTML export.
Instantly convert raw cURL commands into JavaScript fetch(), Axios, or Python requests code.
Generate, salt, and verify bcrypt hashes instantly. Features adjustable salt rounds and strict security validation.
Translate cryptic cron syntax into human-readable English instantly. Visualize execution dates and structure.
Format, beautify, and align your messy SQL queries. Supports PostgreSQL, MySQL, and standard SQL dialects.
Generate complex CSS box shadows visually. Supports multiple layers, inset shadows, opacity, spread, and real-time live preview.
Instantly generate cryptographically secure UUIDs. Supports versions 1, 3, 4, 5 and bulk generation.
Generate cryptographically secure passwords or memorable Diceware passphrases natively in your browser.