URL Encoder
Encode or decode URL components and inspect query parameters.
← All tools
You choose what comes next
Request a Tool
blackccbox is free during public beta. Vote for a planned tool below, or describe a different everyday task you want us to simplify.
Vote for a planned tool
One click is enough. We collect only the option ID—not anything you type elsewhere on this page.
YAML ↔ JSON
Convert and validate YAML and JSON locally in the browser.
CSV Cleaner
Remove duplicates, normalize columns, and repair common CSV issues.
JSON to TypeScript
Generate readable TypeScript interfaces from sample JSON.
PDF Watermark
Add text or image watermarks to PDF pages without uploading files.
SVG Optimizer
Reduce SVG size and preview the cleaned result before downloading.
Contrast Checker
Check WCAG contrast ratios and explore accessible color alternatives.
UTM Builder
Build clean campaign links and keep naming consistent.
Request something different
Tell us the task, the input you have, and the output you need. A concrete example helps us understand the problem.