UD5 Toolkit
Screen Reader Text Preview - Online See Hidden A11y Labels
Enter HTML with aria-labels and see what a screen reader would announce. Simulates common patterns. Local educational tool.
Screen Reader Text Visualizer - Online View Hidden A11y Content
Screen Reader Text Visualizer
Reveal hidden accessibility content — sr-only text, ARIA labels, alt text & more
A11y Inspector
Detected:
0 SR-Only
0 ARIA Labels
0 Descriptions
0 Alt Texts
0 Roles
Total: 0
Live Preview Ready
Paste HTML and click "Render & Visualize"
Hidden A11y content will appear highlighted here
Detected A11y Content 0 items
No A11y content detected yet
Results will appear here after rendering
Frequently Asked Questions
What is screen reader-only (sr-only) text?
Screen reader-only text is content visually hidden but accessible to assistive technologies like screen readers. It uses CSS techniques (position: absolute, clip, 1px dimensions) to hide content from sighted users while keeping it in the accessibility tree. Common examples include "Skip to content" links and form label clarifications.
Why do developers use sr-only content?
Developers add sr-only text to provide context that's obvious visually but missing for screen reader users. For instance, icon buttons need hidden labels, data tables may need hidden headers, and page sections often have hidden navigation landmarks. It bridges the gap between visual design and accessible experience.
What's the difference between aria-label and sr-only?
aria-label is an HTML attribute that provides an accessible name directly on an element, while sr-only uses CSS-hidden DOM text. aria-label doesn't appear in the DOM as visible text; sr-only text exists in the DOM but is visually hidden. Both serve screen readers but have different use cases and browser/translation tool behaviors.
How does this visualizer help with accessibility testing?
This tool reveals invisible accessibility content by parsing your HTML and highlighting hidden elements in a live preview. It detects sr-only classes, ARIA attributes, alt text, roles, and aria-hidden elements — giving you a complete map of what screen reader users actually encounter. Essential for accessibility audits and debugging.
What are common sr-only CSS patterns detected?
We detect Bootstrap's .visually-hidden / .sr-only, Tailwind's .sr-only, and custom classes matching patterns like screen-reader-text, assistive-text, and visuallyhidden. We also flag inline styles using clip, clip-path, or position:absolute with tiny dimensions (1px × 1px).
Can I test a live website URL with this tool?
Browser CORS policies may prevent direct URL fetching. For best results, use browser DevTools to copy the page's HTML (Right-click → View Page Source → Copy), then paste it here. This ensures you get the complete DOM including all sr-only and ARIA content.
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.
Handwriting Worksheet Generator - Online Traceable Letters
Create custom traceable handwriting worksheets with name or sentence. Print in dotted font. Great for teachers and parents.
ASCII Text Signature Generator - Online Figlet & Banner
Type your name and create a stylized ASCII text banner for email signatures or forum posts. Choose a font style.
Screen Color Depth Checker - Online 8‑bit vs 16‑bit
See your monitor's color depth and pixel depth. Detect if HDR or wide gamut is available using media queries.
Unicode Blocks Browser - Online Explore All Scripts
Browse Unicode by block: Latin, Cyrillic, CJK, Emoticons. See characters and copy with a click. Full reference.
CSS Easing Curves Visualizer - Online Cubic & Steps
Graph a cubic‑bezier or steps easing function and see a bouncing ball animation using it. Copy the CSS timing‑function.
User Agent Parser - Online Browser & OS Detector
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Text Diff Checker - Online Compare & Find Differences
Compare two text blocks and highlight differences line by line. Ideal for code review and document revisions. All diffs computed locally for privacy.
XSS Payload Sandbox - Online Test Escape Characters
Paste a potential XSS vector and see if it executes in a sandboxed iframe. For security researchers and education.
Telegram Bot Markdown/HTML Builder - Online Message Formatter
Compose messages with bold, italic, links, and code. See the raw HTML or Markdown for your Telegram bot API calls.
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.
Iframe Sandbox Configurator - Online Test Permissions
Build an iframe with different sandbox flags and see live which features are blocked. For secure embedding.
Pathfinding Visualizer - Online A*, Dijkstra & BFS Grid
Draw walls on a grid and watch A*, Dijkstra, or BFS find the shortest path. Interactive animation. Learn graph traversal.
Browser Extension Headers Check - Online Detect Injected Scripts
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
JWT Viewer & Verifier - Online Decode & Check Signature
Paste a JSON Web Token and decode its header and payload. Verify signature if you provide the secret. Fully local.
Gradient Border CSS Generator - Online Animated & Static
Design borders with linear or conic gradients. Supports border‑image and background‑clip methods. Copy optimized CSS.
Redirect Rule Tester - Online See How Browsers Follow
Enter a URL and see the full redirect chain with status codes and response times. Also validates against your chosen rule.
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.
Robots.txt Validator - Online Check Syntax & Rules
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Pixel Art Drawing Board - Online Retro Sprite Maker
Draw pixel art with a grid, color palette, and eraser. Export as PNG. Perfect for game developers and hobbyists.
Content Security Policy Evaluator - Online Hash & Nonce Check
Test if a script or style will be allowed by a given CSP. Compute hash/nonce. Strengthen your site’s defense against XSS. Local.
HTTP Security Header Checker - Online HSTS, CSP, X-Frame Analysis
Paste response headers string and get a security audit. Check presence and configuration of key security headers. Local analysis.
Traceroute Simulator - Online Visual Hop Path
Simulate a traceroute by entering a destination IP. Learn about AS paths and latency. Does not send real packets; educational visualisation.
JSON Diff Compare - Online Highlight Differences
Paste two JSON objects and find the structural differences with side‑by‑side highlighted output. Indispensable for API debugging.
Constraint Validation API Tester - Online Form Debug
Test required, pattern, minlength etc. See validity states and custom error messages. Learn browser‑native validation.
Query String Parser & Builder - Online URL Params Editor
Parse a URL's query string into a key-value table, or build a query string from parameters. Perfect for API testing and web development.
Beaufort Wind Scale Visualizer – Online Speed & Sea State
Drag a slider to see wind speed in knots/mph/kmh and the corresponding sea conditions and land effects.
PDF Word Counter - Online Extract & Count
Drop a PDF and count the total words, characters, and pages. Text extraction is done locally. Privacy‑friendly.
Data Structure Visualizer - Online Array, Stack, Queue
Add, remove, push, pop items and watch the data structure change visually. Supports arrays, stacks, and queues. For CS students.