💻 Developer Utilities

Developer Tools

JSON formatter, Base64 encoder, regex tester, UUID generator, hash generator, CSS gradient generator and more — all free, all in your browser.

100% browser-based

100% free & private

Instant results

🔧 Format & Convert

Format, validate, minify and explore JSON with smart JSONPath finder.

JSONFormatValidate

Convert JSON arrays to CSV format. Preview as a table, download .csv.

Convert CSV data to JSON. Auto-detects headers and delimiters.

Encode text or files to Base64, or decode Base64 strings to plain text.

Base64EncodeDecode

Percent-encode URLs or decode encoded query strings instantly.

URLEncodeDecode

Encode special HTML characters to safe entities or decode them.

HTMLEntitiesEncode

Remove whitespace and comments from HTML to reduce file size.

HTMLMinifyCompress

Minify CSS: strip whitespace, comments and shorten hex colours.

CSSMinifyCompress

Remove comments and collapse whitespace from JavaScript files.

JavaScriptMinifyCompress

HTML Beautifier

Format and indent minified or messy HTML with proper indentation.

HTMLBeautifyFormat

Convert Unix timestamps to human-readable dates and vice versa.

UnixTimestampEpoch

Format, validate, minify XML and get XPath for any element instantly.

XMLFormatValidate

Convert XML documents to JSON. Handles attributes and repeated elements.

Color Converter

Pick a colour and convert between HEX, RGB, HSL, HSV and CMYK instantly.

ColorConvertHEX

robots.txt Generator

Build a robots.txt with a visual editor. Control crawlers per agent.

Compare two text or code blocks and see additions and deletions.

CompareTextCode

⚡ Generate Text

Test regular expressions with real-time match highlighting.

RegexRegExpPattern

Generate UUID v1 and v4 identifiers. Bulk generation and formats.

UUIDGUIDUnique ID

Parse cron expressions in plain English. Shows next 8 run times.

CronScheduleParser

CSS Gradient Generator

Build linear, radial and conic CSS gradients visually. Copy the CSS.

CSSGradientDesign

Meta Tag Generator

Generate SEO, Open Graph and Twitter Card meta tags with a form.

Meta TagsSEOOG Tags

IP Address Lookup

See your public IP and geolocation — city, ISP, timezone, ASN.

IPGeolocationLookup

Free Developer Tools — Everything Runs in Your Browser

ToollyX provides a comprehensive set of free developer utilities for frontend developers, backend engineers, DevOps engineers and students. Every tool runs entirely in your browser using JavaScript — no code, no data and no files are ever sent to any server. This makes them fast, private and available offline after the first page load.

JSON, XML and Data Format Tools

The JSON Formatter validates and formats JSON with syntax highlighting and a built-in JSONPath finder. The CSV to JSON converter auto-detects headers and delimiters. The XML Formatter formats, validates and minifies XML documents with XPath support.

Encoding and Comparison Tools

The Base64 Encoder/Decoder handles both text and file encoding. The Hash Generator produces MD5, SHA-1, SHA-256 and SHA-512 hashes from any text or file. The Diff Checker compares two blocks of text or code side by side and highlights every addition and deletion.

Code Generation Tools

UUID Generator — v1 and v4 UUIDs in bulk.
Cron Parser — Parse cron expressions in plain English and list the next 8 run times.
CSS Gradient Generator — Visual builder for linear, radial and conic gradients.
Meta Tag Generator — SEO, Open Graph and Twitter Card tags in one form.
Regex Tester — Real-time match highlighting with flags support.

Frequently Asked Questions