Developer Tools
Free developer utilities JSON, Base64, URL encoding, and number-base conversion.
JSON Formatter
Beautify, validate, and minify JSON instantly.
URL Encoder
Encode or decode a URL or query string instantly.
Base64 Encode & Decode
Convert text to Base64, or decode Base64 back to readable text.
Image to Base64
Convert an image into a Base64 data URI you can embed directly in HTML or CSS.
Binary, Decimal & Hex Converter
Enter a number in any base and instantly see it in binary, decimal, hexadecimal, and octal.
Choosing and using developer tools
These small utilities handle recurring development chores including JSON formatting, Base64 conversion, URL encoding, number-base conversion, and image data URIs. They are designed for quick inspection and transformation of sample data in the browser rather than deployment-time processing of confidential production datasets.
Tips for reliable results
Encoding is not encryption: Base64 and URL encoding make data compatible with another format but do not make it secret. Validate transformed output in the system where you plan to use it, preserve a copy of the original, and avoid pasting passwords, access tokens, customer records, or other sensitive production information into any web utility.
Choose a tool above to see its inputs, method, privacy notes, examples, limitations, and answers to common questions. Related tools are linked on every page so you can continue a task without returning to search.