Category
Developer Tools
35 tools · 35 run entirely in your browser
Everyday encoding, decoding, diffing and inspection tasks, finished in one tab. Sensitive input such as JWTs, passwords and text never leaves the browser, because the work happens in JavaScript on your own machine.
All developer tools
JSON Formatter
Beautify or minify JSON, with precise error positions.
JSON Validator
Pinpoint JSON errors by line and column, instantly.
Base64 Encoder
UTF-8-safe Base64 encoding, including URL-safe mode.
Base64 Decoder
Decode standard or URL-safe Base64 back to readable text.
URL Encoder
Percent-encode values or whole URLs, correctly.
URL Decoder
Turn percent-encoded links back into readable text.
JWT Decoder
Read JWT claims and optionally verify HMAC signatures.
Password Generator
Cryptographically secure passwords with entropy scoring.
UUID Generator
Bulk random UUID v4 generation with format options.
Hash Generator
MD5 and SHA digests for text or files, computed locally.
Regex Tester
Live regex matching, groups and replace preview.
Word Counter
Words, characters, sentences, paragraphs and reading time.
Character Counter
Live character count against any limit you choose.
Case Converter
Switch between nine letter cases without retyping.
Duplicate Line Remover
Remove repeated lines while keeping the original order.
Text Reverser
Reverse characters, words or lines safely.
Whitespace Remover
Trim, collapse and remove unwanted whitespace.
Slug Generator
Create readable, lowercase URL slugs.
Lorem Ipsum Generator
Placeholder copy in paragraphs, sentences or words.
Text Diff Checker
Line-by-line differences between two texts.
CSV to JSON
Turn CSV rows into clean JSON objects.
JSON to CSV
Turn JSON arrays into spreadsheet-ready CSV.
HTML to Markdown
Turn HTML into readable Markdown.
Markdown Editor
Write Markdown with a live, sanitised preview.
File Hash Verifier
Check a file against a published checksum.
Password Strength Checker
Estimate password strength without sending it anywhere.
Secure Token Generator
Cryptographically random API keys and secrets.
CSV Viewer
Inspect CSV rows, columns and irregular data.
HTML Minifier
Compress HTML without breaking inline code.
CSS Minifier
Compress CSS while keeping values intact.
JS Minifier
Strip JS comments and whitespace conservatively.
User-Agent Parser
Decode browser, OS and bot details from a UA string.
PII Detector
Find personal data in pasted text.
PDF Metadata Inspector
Inspect hidden metadata in a PDF.
Text Redaction Helper
Replace detected personal data in text.
How these tools handle your data
Each tool page carries a processing label. “Runs in your browser” means the work happens locally with JavaScript. “Public lookup” tools send only the value you type — such as a hostname or MAC address — to a documented third-party API. “Uses a KitJade API” means a small Cloudflare Worker performs the check so that browser CORS rules cannot be bypassed.