All tools
Developer toolbox
Everything runs in your browser unless a tool says otherwise. Nothing is stored.
Text & Format
12 toolsJSON Formatter
Format, minify, and validate JSON.
JSON Validator
Validate JSON and pinpoint syntax errors.
JWT Decoder
Decode JWT header, payload, and signature locally.
Base64 Tool
Encode and decode Base64 text.
URL Encoder
Encode and decode URL components.
HTML Formatter
Format and tidy HTML markup.
CSS Formatter
Format and tidy CSS rules.
Text Diff
Compare two pieces of text line by line.
Markdown Preview
Render Markdown to sanitized HTML.
Word Counter
Count characters, words, and reading time.
Slug Generator
Generate URL-safe slugs from text.
Lorem Ipsum
Generate placeholder Lorem Ipsum text.