Developer Tools
Free, practical browser-based utilities for everyday development work. These tools are designed for quick inspection and transformation tasks while you are coding, debugging, or learning.
Each tool has its own focused page so you can use it directly and then read the related developer guidance when you need more context.
Privacy: these tools process normal input locally in your browser where supported. Do not paste production passwords, private keys, access tokens, API secrets, or confidential customer data into any online tool.
Choose a tool
CSS Button Editor
Design glossy buttons and generate ready-to-copy HTML, CSS, and SVG.
Open editor âJSON Formatter & Validator
Format JSON and check it for syntax errors while inspecting API or configuration data.
Open tool âBase64 Encoder / Decoder
Encode and decode UTF-8 text as Base64 and understand when representation is preferable to encryption.
Open tool âGUID / UUID Generator
Generate UUID values quickly in your browser for development and testing.
Open tool âJWT Inspector
Decode JWT headers and payloads for debugging without treating decoding as verification.
Open tool âRegex Tester
Test JavaScript regular expressions and inspect matches and capture groups.
Open tool âUnix Timestamp Converter
Convert timestamps and dates in both directions for API and logging work.
Open tool âURL Encoder / Decoder
Encode or decode URL components, query values, and text safely.
Open tool âHTML Encoder / Decoder
Encode HTML-sensitive characters or decode entities when working with markup.
Open tool âCode Equals Sign Aligner
Align assignment equals signs into the same column for cleaner code examples.
Open tool â60 Glossy CSS Buttons
Browse button designs with live previews and one-click HTML and CSS copying.
Open tool âHow to use these tools safely
Use a developer tool for temporary, non-sensitive data whenever possible. For authentication tokens, customer records, private source code, credentials, and production configuration, use a trusted local tool or an approved internal environment instead.
After transforming data, verify the result in the system that will consume it. A formatter can improve readability, for example, but it does not prove that an API payload is semantically correct.
Developer Guides
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