Web and Internet

Highlight JavaScript, HTML, CSS, JSON, SQL, Bash, Python, or Go code with local highlight.js, and copyable preview HTML.

Web and Internet

Add campaign parameters such as utm_source, utm_medium, and utm_campaign to the destination URL locally in the browser, preserving existing query parameters and anchors while supporting copying and downloading.

Web and Internet

Set a countdown and refresh the current tool page.

Web and Internet

Query the current public address through a third-party IP service.

Web and Internet

Split CSV/TSV text line by line using the specified delimiter, use the first row as table headers, and the remaining rows as cells; quoted CSV fields are not parsed.

Web and Internet

Generate button previews in real time with style presets and visual parameters, then export reusable HTML and CSS, with support for icons, gradients, states, and responsive widths.

Web and Internet

Generate a linear gradient preview from two colors and an angle, along with the corresponding background CSS.

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Query public records through Cloudflare DNS over HTTPS, and display them under Answer, Authority, Additional, and TTL.

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Parse IPv4/CIDR locally in the browser and calculate the standard network, subnet mask, wildcard mask, broadcast address, and available host range.

Web and Internet

Use the local DOMPurify to clean HTML under three fixed presets: strict rich text, common HTML, or text only; deleted elements and attributes are also reported.

Web and Internet

Use the local HTML parser to format documents, with options for syntax errors, indentation, and line breaks.

Web and Internet

Convert Markdown and HTML bidirectionally in the browser, with safe preview, copy, and download support.

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Convert static HTML locally into JSX usable by React, Preact, or Solid, and report dangerous content that was removed.

Web and Internet

This tool combines common operating-system, editor, language, and framework rules offline, preserves rule order and last-match semantics, and generates an editable .gitignore.

Web and Internet

Preview HTML, CSS, and JavaScript in an isolated sandbox, and choose a runtime from restricted CDN; other network access, form submissions, pop-ups, and parent-page access are disabled by default, and drafts must be explicitly saved; the limits are 512 KiB and 7 days before expiration.

Web and Internet

Convert HTML into an escaped JavaScript template string declaration, or into a JSON string literal.

Web and Internet

By default, performs HTML entity escaping and restoration; you can also switch to JavaScript string or URL Component mode.

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A quick reference table of common semantics for GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS, and TRACE.

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Display common 2xx, 3xx, 4xx, 5xx HTTP status codes, English names, and brief meanings.

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Displays MIME types for common web, image, document, and compressed file extensions.

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Parse pasted HTML locally, and extract the title, plus the name/property/content of all meta tags and the rel/href of link tags.

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Bidirectionally convert between px and rem values using a custom root font size.

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Open the shared URL workbench in the default JavaScript URI encoding and decoding mode, with the option to switch between query parameter review and JSON mapping.

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Open the shared URL workspace in query-parameter read-only review mode by default, with support for duplicate keys, fragment preservation, and stable sorting.

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Open the shared workbench with the URL parameter and JSON mapping mode; duplicate keys are represented as arrays, and nested values are serialized as JSON strings when generating a Query.

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Fill the id list and the same-position name list into the URL template with {id} and {name} placeholders, and generate encoded addresses line by line.

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Convert locally between XML and JSON using explicit mappings, preserving attributes, text, repeated child elements, arrays, and namespace names; CDATA is merged into text.

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Generate robots.txt and sitemap.xml from the manually entered base URL and paths; the site is not crawled.

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Generate a favicon preview, Web App Manifest, and HTML link tag from a local image.

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Generate Open Graph and Twitter Card meta tags locally, with a preview after safe escaping.

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Generate JSON-LD for WebSite, Article, Product, and FAQPage, and perform static checks on required fields.

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Normalize title text locally to generate a lowercase, hyphen-separated, length-limited URL slug.

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Perform a basic accessibility audit on local HTML, checking alt, label, heading hierarchy, duplicate id, and empty controls.

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Parse local Header text, preserving original field names, duplicate fields, normalized mappings, and control-character warnings.

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Generate Nginx, Apache, and Cloudflare redirect text from the old path, new path, status code, and query options.

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Validate required Web Manifest fields, scope/start_url relationships, and icon metadata, and output JSON and link tags.

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Build and parse locally between text and Data URI, with support for MIME parameters, percent encoding, and Base64.

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Expand paths, query, and list variables according to RFC 6570 Level 1–2, without evaluating expressions or accessing the network.

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Parse and build the Cache-Control header, while also generating normalized text, Nginx fragments, and conflict warnings.

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Parse the HTML tree, attributes, and XPath 1.0 matches locally, without executing scripts or loading resources from the input.

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Search the built-in, versioned Linux command catalog, including options and examples; no shell commands are executed.

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Parse the protocol, host, port, path, query parameters, hash, and encoding results of URL locally.

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Enter HTML and the base URL to classify internal, external, anchor, dangerous, and duplicate links locally; links are not actively requested.

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Generate and statically validate Supervisor and Nginx configurations locally without connecting to servers or writing system files.

Web and Internet