JSON Formatter & Validator
Format, minify, and validate JSON. Nothing leaves your browser.
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Using AI? Optimize your prompts first.
Better prompts = better output = fewer revisions.
Try the Prompt Optimizer — Free →You might also like
JSON to CSV Converter
Convert between JSON and CSV instantly. Bidirectional conversion, paste and go. Free, runs in your browser.
Base64 Encoder Decoder
Encode text to Base64 or decode Base64 strings. Full UTF-8 support. Free, runs in your browser.
URL Encoder Decoder
Encode and decode URL strings. Component and full URL encoding. Free.
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.
100% client-side where applicable — your files and inputs stay in your browser. Nothing is uploaded to HundredTabs servers for these tools.