Free HTML Web Apps and Online Tools

Aspose.HTML web apps are free browser-based tools for converting documents, generating HTML and color code, checking web accessibility, analyzing websites, validating YAML, and formatting structured data. Use them for quick manual tasks without installing software.

This page groups the applications by task. For page summarization, AI-assisted keyword extraction, prompt generation, and AI-generated color combinations, see Free AI Applications.

Online Apps or Aspose.HTML for .NET?

Use an online app for an occasional task that you want to complete manually in a browser. Use Aspose.HTML for .NET when the workflow must run repeatedly, process files in batches, execute in a service, or integrate with C# application logic.

For programmatic workflows, see:

• Converting Between Formats – automate conversion to PDF, XPS, DOCX, images, MHTML, and Markdown.
• Working with HTML Documents – create, edit, and save HTML documents through the DOM API.
• Web Accessibility – run accessibility checks and save reports in C#.
• Data Extraction – extract content, inspect HTML, download resources, and process websites.

File Converters

• HTML Converter – convert HTML to PDF, XPS, DOCX, MHTML, Markdown, and image formats.
• XHTML Converter – convert XHTML to PDF, XPS, DOCX, MHTML, Markdown, and images.
• MHTML Converter – convert MHTML web archives to PDF, XPS, DOCX, and image formats.
• EPUB Converter – convert EPUB publications to PDF, XPS, DOCX, and images.
• XML Converter – convert XML documents to PDF, XPS, DOCX, and image formats.
• Markdown Converter – convert Markdown to HTML, PDF, XPS, DOCX, and images.
• ZIP Converter – convert supported HTML-based documents stored in a ZIP archive to document or image formats.

HTML and Color Generators

• HTML Table Generator – configure rows, columns, and styles, then copy the generated HTML table code.
• iFrame Generator – generate <iframe> markup with the required URL, size, scrolling, and border settings.
• Random Color Generator – generate random colors and palettes as HEX color codes.
• Color Palette Generator – extract a color palette from an uploaded image.
• Color Wheel – explore color harmonies and create palettes with HEX codes.

Web Accessibility Tools

• Web Accessibility Checker – scan a web page or HTML document and review reported HTML and CSS accessibility issues.
• Color Contrast Accessibility – inspect color contrast across a web page and identify content that requires review.
• Color Contrast Checker – calculate the contrast ratio between text and background colors.
• Alt Text Checker – find non-text elements that do not provide the required text alternatives.
• Image Alt Tag Checker – identify <img> elements with missing or empty alt attributes.
• Anchor Text Checker – inspect link text and generate a report for SEO and accessibility review.
• Title Tag Checker – check whether an HTML document has a descriptive title element of an appropriate length.

SEO and Website Analysis

• Sitemap Validator – validate an XML sitemap and review structural or syntax issues.
• Broken Link Checker – scan a web page and report links that cannot be reached.
• Keywords Extractor – extract keywords from a specified web page for content and SEO analysis.
• Minifiers – reduce HTML, CSS, or JavaScript source size by removing unnecessary characters.
• Website Meta Tag Checker – inspect website metadata for SEO and accessibility review.

YAML Tools

• YAML Validator – validate YAML syntax and identify formatting or structural errors.
• YAML to JSON – convert YAML configuration or data to JSON.
• JSON to YAML – convert JSON data to YAML.

Mergers and CSS Sprite Tools

• CSS Sprite Generator – combine images into a CSS sprite and generate the accompanying CSS data.
• Document Mergers – merge HTML, XHTML, MHTML, EPUB, or Markdown files and save the combined result in a supported output format.

Unit and Number Converters

• Pixel Calculator – convert pixels to CSS and physical units using a selected DPI value.
• Distance Converter – convert values between metric and imperial distance units.
• Binary Converter – convert values between binary, decimal, octal, and hexadecimal number systems.

URL Tools

• URL Encoding – percent-encode special characters for use in URLs.
• URL Decoding – convert percent-encoded URL data back to readable text.

JSON and XML Formatters

• JSON Formatter – format JSON with readable indentation and structure.
• XML Formatter – format XML markup to make its hierarchy easier to read.

Explore All Aspose.HTML Web Apps

The available tools can change as new applications are released. Visit the Aspose.HTML Web Applications catalog for the current complete collection.