UD5 Toolkit
HTML Boilerplate Generator – Custom HTML5 Skeleton
Configure a modern HTML5 boilerplate with your choice of meta tags, social media cards, favicon links, and CSS/JS includes. Download or copy the code.
Tag: HTML Tools - Encode, Format & Table
62+ toolsHTML Class Name Shortener – Online Reduce File Size
Replace long CSS class names with short random strings. Map generated. For production optimization.
<selectlist> New HTML Element Demo - Online Rich Select
Test the upcoming <selectlist> element for a fully customizable, stylable select dropdown. Experimental browser feature.
HTML Data Attribute Extractor - Online List All data‑*
Paste HTML and extract all unique data‑* attributes into a clean list. Understand the data model of a page.
HTML Color Input Explorer - Online Native Picker & Events
Use <input type='color'> and see its change events and value in hex. Understand the native color picker. Quick demo.
Accessible Form Builder - Online Semantic HTML Generator
Create a fully accessible form by adding fields; the tool generates the proper labels, inputs, and ARIA attributes. Copy the clean HTML.
OpenAPI to HTML Preview - Online Swagger UI Generator
Paste an OpenAPI YAML/JSON and render a static, readable API document. No server, pure browser‑based rendering.
<dialog> Modal Generator - Online Native HTML Modal
Build an accessible modal using the native <dialog> element. Customize backdrop, content, and open/close logic. Copy the code.
HTML Email Signature Builder - Online Professional Footer Creator
Create a polished HTML email signature with your photo, links, and company details. Live preview and copy HTML to clipboard. Works with Gmail, Outlook, Apple Mail.
commandfor & command Attribute Demo - Online Declarative Actions
Use the new `commandfor` and `command` attributes to invoke actions on other elements without JavaScript. See the spec live.
HTML Template Element Demo - Online Clone & Use
Use the <template> tag to hold hidden HTML that is cloned and injected by JavaScript. Common pattern.
HTML Structure Viewer - Online Indented Tag Explorer
Paste HTML and see a collapsible tree of tags. Understand document outline and nesting. Handier than raw code.
Native Accordion Group Generator - Online <details> Sync
Build a group of `<details>` elements where opening one closes others. Optional JavaScript. Copy the accessible snippet.
Lazy Loading Image Snippet Generator - Online
Generate an <img> tag with the loading='lazy' attribute and optional low‑quality placeholder. Improve Core Web Vitals. Copy the snippet.
BBCode to HTML Converter - Online Forum Markup
Translate old‑school BBCode into modern HTML. Supports [b], [i], [url], [img], and more. Keep your legacy content alive. Local.
Pug to HTML Converter - Online Compile Indented Templates
Paste Pug template code and compile it to HTML. See the rendered output instantly. For static site devs.
Exclusive Accordion Generator (name=) - Online HTML‑Only
Use the new `name` attribute on <details> to create an exclusive accordion with zero JavaScript. Copy the clean HTML.
HTML to React JSX Converter - Online Transform Tags
Paste regular HTML and instantly get valid React JSX with proper self‑closing tags and className attributes.
Native Accordion Generator - Online HTML & Summary
Create a pure HTML/CSS accordion using <details> elements. Add custom styling and get the clean code. No JavaScript required.
HTML Validator Lite - Online Check Syntax Errors
Paste HTML and detect unclosed tags, invalid nesting, and duplicate IDs. Lightweight client‑side validation.
HTML lang Validator - Online Check Language Tag
Validate a language tag like en‑US or zh‑Hans against the IANA registry. Ensure correct HTML lang attribute.
HTML Sanitizer API Demo - Online Safe Set HTML
Use the new Sanitizer API to safely insert raw HTML into the DOM. Blocks malicious tags. Experimental demo.
Online Code Editor (HTML/CSS/JS) - Instant Live Preview
Write HTML, CSS, and JavaScript in separate panes and see the result in real time. Store your snippets locally.
<datalist> Autocomplete Tester - Online ComboBox Demo
See how <datalist> works across browsers. Test with many options. Copy the minimal markup. Simple native autocomplete.
Markdown to Email HTML - Online Newsletter Template
Write in Markdown and get clean, inline‑styled HTML suitable for emails. Pre‑designed templates included. Local conversion.
HTML to Plain Text Converter - Online Strip Tags for Clean Copy
Paste HTML and convert to plain text while preserving basic structure (paragraphs, list items). Removes all tags and images. Instant local processing.
HTML to Rich Text Copier - Online Format for Word/Google Docs
Paste HTML and copy the formatted rich text to your clipboard. Paste directly into Word or Google Docs with styles intact.
HTML Minifier Comparison - Online See Savings Live
Paste HTML and see a before/after comparison of minified output. Check the byte savings. All local.
ARIA Attribute Validator - Online Check HTML Accessibility
Paste an HTML snippet and check for common ARIA mistakes: missing labels, invalid roles, and aria‑hidden misuse. Educate your team.
<abbr> Tag Generator - Online HTML Abbreviation Builder
Type an abbreviation and its full form to get the proper `<abbr title='...'>` HTML. For accessible markup.
HTML to BBCode Converter - Online Reverse Markup
Convert simple HTML back into BBCode for forum posts. Strips unsupported tags. Keep the conversation going on legacy boards.
Code Syntax Highlighter - Online Beautiful Code Preview
Paste code and get a beautifully highlighted preview with line numbers. Supports many languages. Copy as HTML. Pure frontend.
HTML Comment Extractor/Remover - Online Strip Comments
Paste HTML code and extract all comments or remove them completely. See a list of comments found. Clean your markup.
Number Input Step Demo - Online See Validation Behavior
Test min, max, and step constraints on `<input type='number'>`. See how invalid values are handled. Undocumented behavior.
Marquee Text Generator - Online Retro Scrolling Tag
Create a customizable scrolling marquee banner. Copy the HTML and CSS. For retro web projects or fun.
Popover Menu Builder - Online HTML‑Only Dropdown
Create a pure HTML dropdown menu using the popover attribute. Style it with CSS and copy the accessible snippet. No JavaScript.
HTML Headings Outline Generator - Online From Webpage
Enter a URL and see a nested list of all headings (h1‑h6). Check your document structure for SEO and accessibility. Pure fetch.
HTML Escape/Unescape Live Preview - Online Sandbox
Type raw HTML and see the escaped version, then see how it renders when unescaped. Understand encoding better.
HTML to SVG Converter - Online Render DOM to Vector
Paste an HTML snippet and convert it into an SVG image that visually replicates the DOM. Useful for creating static snapshots. Local canvas rendering.
HTML Attribute Remover - Online Clean Up Markup
Strip specific or all attributes from HTML tags. Clean up messy code. Keep the structure. Purely local.
HTML to React JSX Converter - Online Quick Migration
Paste standard HTML and get a valid React JSX component. Converts class to className, inline styles, etc. Local transformation.
HTML to XML Converter - Online Markup Translator
Convert HTML code into well‑formed XML with proper self‑closing tags and attributes. Fixes common HTML5/XHTML mismatches. Local only.
Text to Definition List - Online Term/Description HTML Maker
Enter terms and definitions and generate a clean `<dl>` HTML snippet. Great for glossaries and FAQs.
Screen Reader Test Snippet - Online Check HTML ARIA Labels
Paste an HTML snippet and see how a screen reader might interpret it. Highlights missing alt texts and ARIA misuses. Educational.
Email Signature Generator - Online Professional HTML Footer
Design a clean, professional email signature with your photo, links, and disclaimers. Copy the HTML to use in Gmail/Outlook.
HTML to Pug Converter - Online Indented Template Syntax
Convert standard HTML into Pug (formerly Jade) syntax. Clean, indented output. For Node.js templating. Client‑side.
Popover API Demo - Online No‑JS Tooltips & Menus
Test the new HTML popover attribute for creating accessible tooltips, menus, and dialogs without JavaScript. Copy code snippets.
HTML to Text with Line Breaks - Online Just the Words
Convert HTML to plain text while preserving paragraph breaks. Remove images, links, and scripts. Quick data extraction.
Remove HTML Tags - Online Strip Code Cleaner
Paste HTML and instantly remove all tags, leaving only the text content. Optional keep line breaks. Quick cleaning.
CSV to HTML Table - Online Generate Responsive Code
Paste CSV and get a beautiful HTML table with sortable headers (optional). Copy the full HTML/CSS snippet. Local.
Text to Ordered List - Online Automatic Numbering HTML
Paste lines of text and automatically convert to an HTML ordered list with correct numbering and indentation.
Markdown to HTML Converter - Online MD to Webpage Tool
Convert Markdown text into clean HTML code. GitHub Flavored Markdown supported. Copy the raw HTML or preview the rendered output instantly. No uploads.
HTML Fragment to PDF - Online Print Custom Section
Write or paste an HTML snippet and generate a PDF using the browser's print engine. Customize page size and margins.
Text to List Converter - Online Bulleted or Numbered HTML
Convert plain text lines into HTML ordered or unordered lists. Instantly copy the generated HTML to paste into your website. No hassle, fully browser-based.
HTML Includes Previewer - Online Simulate SSI Includes
Paste multiple HTML snippets (header, footer) and a main content, then combine them into a single preview. Static site helper.
HTML Live Previewer - Online Code to Rendered View
Write or paste HTML, CSS, and JavaScript and instantly see the rendered output in a sandboxed iframe. A handy frontend prototyping tool.
HTML Table to Markdown Converter - Online Quick Transform
Paste an HTML `<table>` snippet and instantly get a clean Markdown table. Supports colspan and alignment hints. Local.
Mailto Link Generator - Online HTML Email Link
Build a complex mailto: link with to, cc, bcc, subject, and body. Get the HTML anchor tag. Local.
HTML Minifier - Online Compress Web Pages
Reduce your HTML file size by stripping whitespace, comments, and optional closing tags. Secure browser‑based.
HTML to Markdown Converter - Online Clean Content Extractor
Strip HTML tags and convert web content to plain Markdown. Preserve headings, lists, and links. Perfect for content migration. All processing in browser.