Free Online Developer Tools
Browse 10 free online developer tools. Every tool runs entirely in your browser — no upload, no signup, no install.
All tools in this category (10)
JSON Formatter
Format, minify and validate JSON with syntax highlighting.
Use nowBase64 Encode/Decode
Encode and decode Base64 for text and files.
Use nowTimestamp Converter
Convert between Unix timestamp and date-time, seconds/ms.
Use nowRegex Tester
Test regular expressions with live highlighting and groups.
Use nowDiff Checker
Compare two texts line by line with colored differences.
Use nowMarkdown Editor
Write Markdown with live preview and HTML export.
Use nowCSV to JSON Converter
Convert between CSV and JSON both ways with headers.
Use nowHTML Entity Converter
Encode and decode HTML entities including < & etc.
Use nowText Encryptor
Encrypt and decrypt text locally with AES-GCM.
Use nowHash Generator
Compute MD5, SHA-1, SHA-256 hashes of text or files.
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