Developer tools that never see your data

RapidSolns DevTools 72 developer tools that run entirely inside your browser. Nothing you paste is uploaded, logged, or sent anywhere — there is no server to send it to. No account, no cookies, no analytics. This site needs JavaScript enabled, because every tool runs on your machine rather than on a server.What's included

AI — token and cost estimator, prompt optimizer, prompt template expander, JSON repair, context budget planner, embedding vector math, invisible character scanner, chat message builder, text chunker, SSE stream viewer, JSON Schema validator, AI crawler policy generator

Data — JSON formatter, JSON diff, JSON query, CSV viewer, XML formatter, text diff, Markdown preview, Unicode inspector, text statistics

Encode / decode — Base64, JWT decoder, URL encoder, HTML entities, string escaping, image to data URI

Generate — SHA hashes, UUIDs, passwords, JWTs, AES and RSA keys, colour palettes, slugs, Lorem Ipsum

Convert — Unix timestamps, colour spaces, number bases, YAML to JSON, JSON to TypeScript, byte sizes, px to rem, WCAG contrast

Dev — regex tester, cron parser, CIDR calculator, chmod calculator, cURL builder, hex viewer, SQL and GraphQL formatters, HTTP status and header references, DNS record types, port numbers, git cheatsheet