Text Case Converter
Twelve common case transforms — pick one below.
Using AI? Optimize your prompts first.
Better prompts = better output = fewer revisions.
Try the Prompt Optimizer — Free →You might also like
Word Counter
Count words, characters, sentences, paragraphs, reading time, and estimated AI tokens. Free, instant.
Markdown to HTML Converter
Convert markdown to clean HTML with live preview. Download as .html file. Free, runs in your browser.
AI Prompt Optimizer
Paste any AI prompt and get an optimized version using the ICCSSE framework. Works for ChatGPT, Claude, and Gemini. Free, no signup, runs in your browser.
AI Prompt Grader
Paste any prompt and get a score out of 100 with specific fixes for identity, constraints, specificity, structure, and examples. Free prompt scoring tool.
100% client-side where applicable — your files and inputs stay in your browser. Nothing is uploaded to HundredTabs servers for these tools.