QR Code Generator
Create downloadable QR codes for URLs, text, Wi-Fi networks and contact cards.
Developer toolsOpenChoose a task
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Password Generator
Generate strong random passwords and check the strength of an existing password.
Developer toolsOpenJSON Viewer
Validate JSON and explore its structure in an expandable tree.
Developer toolsOpenQR Code Scanner
Read QR codes from uploaded images or a device camera directly in the browser.
Developer toolsOpenCSV/JSON Converter
Convert tabular CSV data to JSON or a JSON array of objects back to CSV.
Developer toolsOpenBase64 Encoder/Decoder
Encode UTF-8 text to Base64 or decode Base64 back to readable text.
Developer toolsOpenRegex Tester
Test regular expressions, inspect matches and preview replacements against pasted text.
Developer toolsOpenJWT Decoder
Decode JSON Web Token headers and payloads locally without verifying the signature.
Developer toolsOpenURL Encoder/Decoder
Encode or decode URL components containing spaces, symbols and Unicode text.
Developer toolsOpenHTML Viewer
Preview HTML inside a sandboxed frame without running scripts.
Developer toolsOpenRGB to HEX
Convert red, green and blue channel values to a hexadecimal colour.
Developer toolsOpenAbout these tools
Developer tools include JSON viewing, Base64 and binary conversion, URL encoding, JWT decoding, regular-expression testing, QR utilities, password generation and colour conversion.
When to use them
Use these tools for debugging API responses, preparing encoded values, checking patterns, inspecting tokens and creating small development assets.
Frequently asked questions
Does the JWT decoder verify signatures?
No. Decoding makes the header and payload readable but does not prove that the token is authentic.
Can JSON be valid but still wrong?
Yes. Syntax validation confirms that the JSON can be parsed; an API may still reject valid JSON when fields or value types do not match its expected schema.
Are generated passwords saved?
The Password Generator creates values in the browser. Copy them into a trusted password manager rather than storing them in an unsecured note.