Developer
Formatters, validators, generators, and text diff encoders.
Format, beautify, minify, and validate JSON, plus convert between JSON, YAML, and XML.
Encode textual data or upload files into Base64 format and vice versa.
Instantly generate random RFC 4122-compliant UUIDs (v4) in bulk for database keys.
Produce cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) for text blocks instantly.
Generate custom JWTs with HMAC signing, and decode/inspect JWT tokens with signature verification.
Test, debug, and explain regular expressions with real-time matching highlight.
Safe conversion of parameters to URL query format or decoding escaped path values.
Compare two text snippets side-by-side to highlight added, removed, or changed lines.
Convert Unix timestamps to readable calendar dates and vice versa.
Generate sets of dummy mock profiles (emails, addresses, phone numbers) for app test databases.
Write and execute SQL queries in-browser using a local SQLite database.
Run a comprehensive search engine optimization audit on any page to improve positioning.
Generate custom QR codes for URLs, text, Wi-Fi connections, and emails.
Scan or upload QR codes to read their content instantly.
About Developer Online Tools
Our suite of developer utilities is designed to offer fast, clean, and highly secure operations directly in your web browser. Unlike other online converters that upload your inputs to external databases, all calculations are executed completely inside your browser locally using standard HTML5 and JavaScript APIs.
Key Benefits of Using Tools
- 100% Privacy: No data is ever transmitted to a server. Work safely with private keys, API configs, and proprietary code.
- Offline Functionality: Since tools are client-side powered, they continue working even if you lose internet connection.
- Instant Load: Code split using lazy-loaded Next.js structures, ensuring only the tool you open loads its code logic.