Web

38 tools

SQL Formatter

Format SQL statements online. The tool breaks a one-line query into readable lines by inserting a line break before keywords such as SELECT, FROM, WHERE, JOIN and ORDER BY, making long statements much easier to read.

Markdown to HTML Converter

Convert Markdown text to HTML online. Supports heading levels one to three, bold, italic and line breaks, with Markdown on the left, a live rendered preview on the right, a source view and one-click copying.

TOML to YAML Converter

Convert TOML configuration to YAML online. Paste TOML content such as a Cargo.toml or pyproject.toml snippet and the equivalent YAML text appears instantly, which is handy for migrating configuration formats.

YAML to TOML Converter

Convert YAML data to TOML online. Paste a YAML mapping and the equivalent TOML text appears instantly, which is useful when writing Cargo.toml, pyproject.toml or migrating configuration to TOML.

XML Formatter

Format XML online. Paste XML that has been squeezed onto one line or badly indented and the tool re-indents it by tag nesting level as you type, ideal for tidying API responses and configuration files.

YAML Formatter and Validator

Validate and format YAML online. The tool checks your YAML syntax as you type, reports parse errors, outputs a normalized version with consistent indentation, and offers a JSON view of the same data.

HTML WYSIWYG Editor

Edit rich text visually and export the HTML. The toolbar offers bold, italic, underline, strikethrough, headings, lists and links, and the generated HTML source updates live and can be copied with one click.

MIME Types Cheat Sheet

Look up MIME types online. The cheat sheet lists 33 common file extensions with their MIME types, supports searching by extension, MIME type or description, and copies any value with a single click.

JSON Diff Tool

Compare two JSON documents online. The tool walks every level recursively and lists added, removed and changed keys with their exact paths, treating arrays as single values, which suits API responses and configuration checks.

JSONL Viewer

View and inspect JSON Lines data online. Paste or upload a .jsonl file, parse it line by line, search the list on the left to find a record, and read the selected line as a collapsible, syntax-highlighted tree on the right, with unparsable lines flagged.

QR Code Decoder

Read QR codes online from uploaded images, clipboard screenshots or images embedded in an Excel list, then copy the decoded content or open it directly if it is a link.

Browser Feature Support Detector

Detect whether your current browser supports recent web standards such as WebGPU, View Transitions and CSS :has() using real runtime feature checks rather than User-Agent sniffing.

Flexbox Layout Generator

Configure flex-direction, justify-content, align-items, flex-wrap and gap visually, preview the layout live and copy the resulting CSS with one click.

CSS Gradient Generator

Build linear and radial CSS gradients visually with an adjustable angle and any number of color stops, previewing the result and copying the background code with one click.

CSS Grid Layout Generator

Configure the columns, rows, gaps and column template of a CSS Grid layout visually, preview the grid live and copy the generated CSS with one click.

URL Parser

Parse any URL online and break it down into protocol, host, path, query string, hash and origin, with every query parameter listed as a name and value pair in a table.

URL Encoder and Decoder

Percent-encode and decode URL text online. Convert special characters to %xx form with encodeURIComponent or encodeURI, decode encoded strings back, and handle Unicode characters correctly.

HTML Entity Encoder and Decoder

Escape and unescape HTML special characters online. Paste text on the left, pick encode or decode, and see the converted result on the right in real time, all processed in your browser.

HTML Minifier

Minify HTML code online. Paste your markup, choose options such as removing comments and collapsing whitespace, and get compressed HTML along with a before-and-after size comparison.

CSS Minifier

Minify CSS code online. Paste your stylesheet, pick a compression level, and get compact CSS with comments removed, shorthand properties merged and color values shortened.

JavaScript Minifier

Minify JavaScript code online. Paste your script, choose options such as removing comments and shortening variable names, and get compact code plus a compression ratio report.

Meta Tag Generator

Generate SEO meta tags online. Fill in the title, description, canonical URL, Open Graph image and Twitter Card details, and get complete meta tag HTML ready to paste into your page head.

Slug Generator

Turn any text into a URL-friendly slug online. Supports mixed Chinese and English input, a choice of hyphen or underscore separator, and lowercase or uppercase output, updated as you type.

User Agent Parser

Parse a User-Agent string online to identify the browser and version, operating system and version, device type (desktop, phone or tablet) and rendering engine, or read your own browser's UA in one click.

HTTP Status Code Cheat Sheet

A searchable reference of 22 common HTTP status codes with bilingual explanations, grouped from 1xx to 5xx and color coded by category, filterable by number or by keyword.

HTTP Headers Parser

Paste raw HTTP request or response headers and get every field broken out with its name, value, and an explanation of what it does, with security-related headers highlighted.

IP Address Lookup

Shows your own public IP automatically and looks up any IPv4 or IPv6 address to reveal its country, region, city, ISP, ASN, coordinates, and time zone.

IPv4 Subnet Calculator

Enter an IPv4 address with a CIDR prefix or a dotted-decimal mask and get the network address, broadcast address, usable host range, host count, and binary breakdown.

Port Scanner Simulator

A searchable reference of common TCP and UDP ports. Look up a port number or service name to see what runs there, which range it belongs to, and any security notes. It is a lookup table for learning and reference, not a tool that actually scans hosts.

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