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.
UD5 Toolkit
Parse, edit, and build URL query strings with ease.
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? symbol. It contains key-value pairs separated by &, used to pass data to a web server. Example: ?category=books&sort=price.encodeURIComponent() so the generated URL is valid. You can toggle encoding off if you need raw characters, but that may break the URL.color[]). Our parser preserves duplicates, and when you switch to JSON view, you'll see them grouped as an array.key=value&key=value format. Modify it directly and apply changes back to the table.#) is parsed and kept separately. You can edit it in the Hash field, and it will be appended correctly after the query string in the full URL.Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Compose messages with bold, italic, links, and code. See the raw HTML or Markdown for your Telegram bot API calls.
Browse Unicode by block: Latin, Cyrillic, CJK, Emoticons. See characters and copy with a click. Full reference.
Test required, pattern, minlength etc. See validity states and custom error messages. Learn browser‑native validation.
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Enter a URL and see the full redirect chain with status codes and response times. Also validates against your chosen rule.
Paste a potential XSS vector and see if it executes in a sandboxed iframe. For security researchers and education.
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.
Paste a JSON Web Token and decode its header and payload. Verify signature if you provide the secret. Fully local.
Design a clean, professional email signature with your photo, links, and disclaimers. Copy the HTML to use in Gmail/Outlook.
Simulate a traceroute by entering a destination IP. Learn about AS paths and latency. Does not send real packets; educational visualisation.
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
Test if a script or style will be allowed by a given CSP. Compute hash/nonce. Strengthen your site’s defense against XSS. Local.
Compare two text blocks and highlight differences line by line. Ideal for code review and document revisions. All diffs computed locally for privacy.
Draw walls on a grid and watch A*, Dijkstra, or BFS find the shortest path. Interactive animation. Learn graph traversal.
Paste response headers string and get a security audit. Check presence and configuration of key security headers. Local analysis.
Type your name and create a stylized ASCII text banner for email signatures or forum posts. Choose a font style.
Paste two JSON objects and find the structural differences with side‑by‑side highlighted output. Indispensable for API debugging.
Draw pixel art with a grid, color palette, and eraser. Export as PNG. Perfect for game developers and hobbyists.
Build an iframe with different sandbox flags and see live which features are blocked. For secure embedding.
Graph a cubic‑bezier or steps easing function and see a bouncing ball animation using it. Copy the CSS timing‑function.
Paste a website's HTML and see which text is only visible to screen readers (e.g., .sr‑only). Preview the accessible layer.
See your monitor's color depth and pixel depth. Detect if HDR or wide gamut is available using media queries.
Paste an HTML snippet and see how a screen reader might interpret it. Highlights missing alt texts and ARIA misuses. Educational.
Design borders with linear or conic gradients. Supports border‑image and background‑clip methods. Copy optimized CSS.
Create custom traceable handwriting worksheets with name or sentence. Print in dotted font. Great for teachers and parents.
Enter HTML with aria-labels and see what a screen reader would announce. Simulates common patterns. Local educational tool.
Paste a full URL or query string and instantly get a pretty JSON object. Parse arrays and nested keys.
Drag songs into a setlist and see total duration. Perfect for planning a concert or DJ set.
Fill in a form to generate a clean, ATS‑friendly one‑page resume. Customize sections, colors, and export as print‑ready PDF. Personal data stays in your browser.