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Prompt Generator
Build clear, structured prompts for ChatGPT, Claude, Gemini and other LLMs by filling in …
Prompt Improver
Score any AI prompt against a prompt-engineering checklist (role, context, format, exampl…
Token Counter
Estimate how many tokens your text uses in GPT, Claude, Gemini or Llama models, plus word…
JSONL Dataset Builder
Convert CSV or prompt/response pairs into chat-format JSONL for fine-tuning OpenAI, Mistr…
GPU VRAM Calculator
Estimate GPU memory needed to run or fine-tune an LLM by parameter count, precision (FP16…
Word Counter
Count words, characters, sentences, and paragraphs in your browser.
Case Converter
Convert text between upper, lower, title, sentence, camel, snake, and kebab case.
Slugify
Turn titles into URL-friendly slugs.
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OpenGenerators
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OpenCalculators
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OpenTime Tools
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OpenNetwork Tools
IP, UA, headers, and URL helpers.
OpenSecurity Tools
Hashes, passwords, and privacy helpers.
OpenPDF Tools
View, sign, and work with PDF files in your browser.
OpenDocuments
Agreements, invoices, and printable document generators.
OpenAPI Tools
Free live APIs: DNS, WHOIS/RDAP, IP/hosting, weather, currency, and AI (your key).
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Font Awesome, CDN snippets, SVG icons, and favicon helpers.
OpenTemplates
Free website starter templates and page layouts you can copy.
OpenAI & ML Tools
Prompt builders, token counters, LLM cost, fine-tuning data and ML training calculators.
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