Base64 Encoder / Decoder
UTF-8 safe. Runs locally in your browser.
Using AI? Optimize your prompts first.
Better prompts = better output = fewer revisions.
Try the Prompt Optimizer — Free →You might also like
URL Encoder Decoder
URL Encoder / Decoder is a free, no signup tool built for knowledge workers. Get the result instantly in your browser and move on—try it now in seconds—try it n
JSON Formatter
JSON Formatter is a free, no signup tool built for knowledge workers. Get the result instantly in your browser and move on—try it now in seconds—try it now
HTML to Markdown Converter
HTML to Markdown lets you convert files fast in your browser. Free, no signup, and designed for clean output you can paste into AI or share—try it now
AI Prompt Optimizer
AI Prompt Optimizer gives you ready-to-use prompts you can copy and customize. Free, no signup, and organized for real workflows—open it now in seconds—try it n
100% client-side where applicable — your files and inputs stay in your browser. Nothing is uploaded to HundredTabs servers for these tools.