Overview
Two command line packages and a growing set of browser tools: sitemap and robots.txt generation and validation, image editing, PDF manipulation, JSON/XML conversion, text processing, AI pull-request review and dependency scanning. All of them free, and the browser ones run without an account.
Generate, validate, and optimize — right in the browser.
Sitemap generator
Create XML sitemaps with URLs, change frequency, and priority settings.
Sitemap validator
Validate XML sitemap structure, URLs, and SEO compliance.
Robots.txt generator
Build robots.txt files with user-agent rules, allow/disallow paths, and sitemap directives.
Robots.txt validator
Validate robots.txt syntax, directives, and crawler permissions.
Meta tag generator
Generate HTML meta tags, Open Graph, and Twitter Card tags for SEO.
Open Graph preview
Preview how your page looks on Facebook, Twitter, Google, and Slack.
URL encoder/decoder
Encode and decode URLs for proper formatting and debugging.
Keyword density analyzer
Analyze keyword frequency and density in your content for SEO.
Google SERP snippet preview
Preview how your title and description will look in Google search results.
Schema markup generator
Generate JSON-LD structured data for FAQ, Article, Product, and more.
UTM campaign URL builder
Build correctly-encoded UTM tracking URLs for your marketing campaigns.
AI-powered code review and security scanning.
Browser-based image editing — your files never leave your device.
Compress image
Compress JPG, PNG, SVG, and GIFs while saving space and maintaining quality.
Resize image
Define your dimensions by percent or pixel, and resize your images.
Crop image
Crop JPG, PNG, or GIFs with ease using pixels or a visual editor.
Convert image
Convert images between JPG, PNG, WebP, GIF, and other formats.
Watermark image
Stamp text over your images with custom typography, transparency, and position.
Rotate image
Rotate or flip JPG, PNG, or GIF images individually or in bulk.
HTML to image
Convert webpages to JPG or PNG by entering a URL.
Image to Base64
Convert images to Base64 strings or decode Base64 back into an image.
Flip image
Flip JPG, PNG, or WebP images horizontally or vertically.
Image color picker
Pick exact pixel colors from an image and extract its dominant palette.
Image EXIF viewer
View camera, exposure, and GPS metadata embedded in JPEG photos.
Favicon generator
Generate a full favicon set (16px to 512px) plus webmanifest and HTML markup.
Merge, split, compress, convert, and protect PDFs — server-side processing, nothing leaves your session.
Merge PDF
Combine multiple PDF files into a single document.
Split PDF
Extract page ranges from a PDF into separate files.
Compress PDF
Reduce PDF file size while preserving content quality.
Rotate PDF
Rotate PDF pages by 90°, 180°, or 270°.
Watermark PDF
Add text watermarks to every page of a PDF.
Page Numbers
Add page numbers to PDF documents with custom formatting.
Protect PDF
Secure PDF files with password protection.
Unlock PDF
Remove password protection from PDF files.
Image to PDF
Convert JPG, PNG, and WebP images to PDF documents.
PDF to Image
Extract PDF pages as individual image files.
Organize PDF
Reorder, delete, and rearrange PDF pages.
Crop PDF
Crop margins and trim PDF page borders.
Repair PDF
Fix and recover corrupted or damaged PDF files.
HTML to PDF
Convert HTML content to PDF documents.
Word to PDF
Convert Word documents (DOC, DOCX) to PDF.
PDF to Word
Convert PDF files to editable Word (DOCX) documents.
Excel to PDF
Convert Excel spreadsheets (XLS, XLSX) to PDF.
PDF to Excel
Convert PDF files to Excel (XLSX) spreadsheets.
PowerPoint to PDF
Convert PowerPoint presentations (PPT, PPTX) to PDF.
PDF to PowerPoint
Convert PDF files to PowerPoint (PPTX) presentations.
PDF to Text
Extract the real text content from any PDF.
PDF metadata editor
View and edit a PDF's title, author, subject, and keywords.
PDF info
Check page count, file size, version, encryption, and word count.
Sign PDF
Draw a signature and stamp it onto any page of a PDF.
Extract images from PDF
Find and download every embedded image from a PDF.
Format, validate, and convert JSON — all in your browser.
JSON formatter
Format and beautify JSON with customizable indentation.
JSON minifier
Minify JSON by removing whitespace and reducing file size.
JSON validator
Validate JSON syntax and analyze structure with error location.
JSON to CSV
Convert JSON arrays to CSV format for spreadsheets.
JSON to YAML
Convert JSON to YAML format for configuration files.
JSON to XML
Convert JSON to XML format with custom root tags.
JSON to TSV
Convert JSON arrays to tab-separated values.
JSON to Excel
Convert JSON data to Excel (XLSX) spreadsheets.
JSON to TypeScript
Generate TypeScript interfaces from JSON automatically.
JSON Flatten/Unflatten
Flatten nested JSON into dot-notation keys, or unflatten it back.
JSON ⇄ Query String
Convert JSON objects to URL query strings and back.
Format, validate, and convert XML — all in your browser.
XML Formatter
Format and beautify XML with customizable indentation.
XML Minifier
Minify XML by removing whitespace and reducing file size.
XML Validator
Validate XML syntax and analyze document structure.
XML to JSON
Convert XML to JSON format for modern APIs.
XML to CSV
Convert XML records to CSV format for spreadsheets.
XML to YAML
Convert XML to YAML format for configuration files.
XML to TSV
Convert XML records to tab-separated values.
XML to Excel
Convert XML data to Excel (XLSX) spreadsheets.
XPath Tester
Test XPath expressions against XML documents and see matched nodes instantly.
CSV to XML
Convert CSV spreadsheets to well-formed XML with configurable tag names.
YAML to XML
Convert YAML configuration files to well-formed XML.
Compare, count, convert, and transform text — all in your browser.
Text Compare
Compare two texts side by side and find differences.
Character Counter
Count characters, words, sentences, and paragraphs.
Word Counter
Analyze word frequency and vocabulary density.
Case Converter
Convert text between uppercase, lowercase, title case, and more.
Lorem Ipsum Generator
Generate placeholder text for design and development.
Text Reverser
Reverse text, words, or lines in various modes.
Slug Generator
Generate URL-friendly slugs from any text.
Markdown Preview
Live preview markdown with formatting.
ROT13 / Caesar Cipher
Encode or decode text with a classic Caesar cipher, including ROT13.
Morse Code Converter
Convert text to Morse code and back, with full letter, digit, and punctuation support.
Letter Frequency Analyzer
Analyze how often each letter appears in your text, with counts and percentages.
UUIDs, colors, tokens, cron, and other everyday dev utilities.
UUID Generator
Generate UUIDs (v1, v4) for use in your applications.
Color Converter
Convert colors between HEX, RGB, HSL, and other formats.
JWT Decoder
Decode and inspect JSON Web Tokens without a server round-trip.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
CSS Minifier
Minify CSS by removing whitespace and reducing file size.
HTML Minifier
Minify HTML by removing whitespace and comments.
QR Code Generator
Generate scannable QR codes from text or URLs.
Password Generator
Generate strong, cryptographically secure passwords with custom length and character sets.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal with arbitrary precision.
HTML Entity Encoder/Decoder
Encode text into HTML entities or decode named and numeric entities back to text.
CSS Gradient Generator
Design linear and radial CSS gradients visually and copy the generated CSS.
Cron Expression Parser
Parse, validate, and describe cron expressions, with next run-time predictions.
Scaffold new projects from templates, generate XML sitemaps by crawling a site, and create or validate robots.txt files.
Install
npm install -g @nayan-ui/cli# or, without installingnpx @nayan-ui/cli [command]
Commands
nayan-ui newnayan-ui new my-app -t exponayan-ui create sitemap -w https://example.comnayan-ui create robots -d /adminnayan-ui validate sitemap -i ./sitemap.xmlnayan-ui validate robots -i ./robots.txt
What it does
- Project scaffoldingCreate projects from the Expo, Games, Next.js and Vite templates.
- SitemapsCrawl a website to generate an XML sitemap, or validate an existing one.
- Robots.txtCreate and validate robots.txt files for crawler control.
- Interactive or notPrompts when you want them, flags when you are scripting CI.
Codex and Claude Code agents that review GitHub pull requests and scan repositories for vulnerable dependencies, with auto-fix.
Install
npm install -g @nayan-ui/ai# or, without installingnpx @nayan-ui/ai [command]
Commands
nayan-ai review <pr-url> -t ghp_xxxnayan-ai review <pr-url> -t ghp_xxx --drynayan-ai review <pr-url> -t ghp_xxx --inlinenayan-ai scan <repo-url> -t ghp_xxxnayan-ai scan <repo-url> -t ghp_xxx --fixnayan-ai scan <repo-url> -t ghp_xxx --llm claude
What it does
- AI code reviewDeep pull-request analysis for bugs, security, performance and test coverage.
- Vulnerability scanningPackage vulnerabilities across npm, Python, Go, Rust and more.
- Auto-fix and PRsFix what it finds and open a pull request describing the change.
- Two providersCodex by default, or Claude Code with one flag.