# UniTools > Free online developer, utility, and image tools designed to run 100% locally in your web browser with zero latency and complete data privacy. UniTools is a privacy-first web application offering 40+ free tools for software engineers, web developers, system administrators, and digital creators. All computations, conversions, decodings, and format operations occur entirely client-side using native browser APIs (Web Crypto, Canvas, DOMParser, etc.). No confidential code, tokens, or files are ever sent to remote servers. - **Website**: https://unitools.naveengumaste.me - **Directory**: https://unitools.naveengumaste.me/tools - **Full LLM Reference**: https://unitools.naveengumaste.me/llms-full.txt --- ## Developer Tools Code-focused generators, decoders, calculators, and playgrounds for engineering workflows. - [Chmod Calculator](https://unitools.naveengumaste.me/tools/chmod-calculator): Calculate numeric (777, 755, 644) and symbolic Linux permissions with visual checkboxes, umask calculations, and copyable shell commands. - [JWT Decoder](https://unitools.naveengumaste.me/tools/jwt-decoder): Safely decode and inspect JSON Web Tokens (JWT) client-side with claim analysis, signature algorithm detection, and expiration timestamp checks. - [Code Formatter](https://unitools.naveengumaste.me/tools/code-formatter): Format, beautify, and align messy or minified JavaScript, HTML, CSS, and SQL code with customizable tab widths. - [Cron Parser](https://unitools.naveengumaste.me/tools/cron-parser): Parse and translate 5-field cron schedule expressions into natural human language with upcoming execution timestamps. - [Diff Checker](https://unitools.naveengumaste.me/tools/diff-checker): Compare two code or text blocks side by side with real-time character- and line-level diff highlighting. - [Flexbox Playground](https://unitools.naveengumaste.me/tools/flexbox-playground): Interactive visual CSS Flexbox sandbox to test justify-content, align-items, flex-direction, and flex-wrap. - [Meta Tag Generator](https://unitools.naveengumaste.me/tools/meta-tag-generator): Generate SEO-optimized Open Graph, Twitter Card, and HTML meta tags with live social preview cards. - [Font Pair Suggester](https://unitools.naveengumaste.me/tools/font-pair-suggester): Browse curated Google Font pairings with real-time typographic contrast preview and CSS imports. - [CSS Gradient Generator](https://unitools.naveengumaste.me/tools/css-gradient-generator): Create multi-stop linear and radial CSS gradients with visual controls, presets, and clean CSS code export. - [Box Shadow Generator](https://unitools.naveengumaste.me/tools/box-shadow-generator): Visually craft multi-layered CSS box shadows with blur, spread, and inset controls. - [JWT Secret Generator](https://unitools.naveengumaste.me/tools/jwt-secret-generator): Generate cryptographically strong random secrets and signing keys for HMAC (HS256, HS384, HS512) authentication. --- ## Utility Tools Everyday productivity helpers for formatting, converting, encoding, and data manipulation. - [HTML Entity Encoder](https://unitools.naveengumaste.me/tools/html-entity-encoder): Encode and decode special characters, named HTML entities, decimal references, and hexadecimal codes to prevent XSS. - [Regex Tester](https://unitools.naveengumaste.me/tools/regex-tester): Test and debug JavaScript and PCRE regular expressions in real-time with colored match highlighting and capture group breakdown. - [UUID Generator](https://unitools.naveengumaste.me/tools/uuid-generator): Generate cryptographically secure UUID v4 (and v1) identifiers in bulk with uppercase, hyphen, and brace formatting options. - [Base64 Encoder / Decoder](https://unitools.naveengumaste.me/tools/base64-encoder): Encode and decode raw text or files to Base64 and URL-safe Base64 strings. - [JSON Formatter & Validator](https://unitools.naveengumaste.me/tools/json-formatter): Format, validate, and minify JSON payloads with line-by-line syntax error detection. - [Color Picker & Converter](https://unitools.naveengumaste.me/tools/color-picker): Extract color palettes and convert values across HEX, RGB, HSL, and HSV color models. - [Password Generator](https://unitools.naveengumaste.me/tools/password-generator): Generate secure, high-entropy passwords with custom length, symbols, numbers, and casing rules. - [Hash Generator](https://unitools.naveengumaste.me/tools/hash-generator): Compute cryptographic hashes (MD5, SHA-1, SHA-256, SHA-384, SHA-512) locally via the Web Crypto API. - [Markdown Preview](https://unitools.naveengumaste.me/tools/markdown-preview): Live split-screen Markdown editor with GitHub Flavored Markdown (GFM) rendering and HTML export. - [Text to Slug](https://unitools.naveengumaste.me/tools/text-to-slug): Convert headings and strings into clean, SEO-friendly URL slugs with custom delimiters. - [QR Code Generator](https://unitools.naveengumaste.me/tools/qr-generator): Create custom QR codes from URLs or plain text with adjustable error correction and PNG/SVG download. - [Unit Converter](https://unitools.naveengumaste.me/tools/unit-converter): Convert units across length, weight, temperature, data storage, speed, and volume. - [Currency Converter](https://unitools.naveengumaste.me/tools/currency-converter): Convert currencies across 150+ world fiat currencies with daily reference rates. - [CSV to JSON Converter](https://unitools.naveengumaste.me/tools/csv-to-json): Convert tabular CSV files and spreadsheets to structured JSON objects or arrays and vice versa. - [YAML to JSON Converter](https://unitools.naveengumaste.me/tools/yaml-to-json): Bidirectional conversion between YAML configurations and JSON structures. - [XML to JSON Converter](https://unitools.naveengumaste.me/tools/xml-to-json): Parse and convert XML hierarchies into JSON with XML attribute preservation. - [Lorem Ipsum Generator](https://unitools.naveengumaste.me/tools/lorem-ipsum-generator): Generate placeholder filler text by paragraphs, sentences, or word counts. - [Case Converter](https://unitools.naveengumaste.me/tools/case-converter): Transform text into camelCase, snake_case, kebab-case, UPPERCASE, lowercase, PascalCase, or Title Case. - [Word & Character Counter](https://unitools.naveengumaste.me/tools/word-counter): Analyze text length with word, character, sentence, paragraph counts, and estimated reading time. - [URL Encoder / Decoder](https://unitools.naveengumaste.me/tools/url-encoder): Encode and decode URL query parameters and paths using standard percent-encoding. - [Number Base Converter](https://unitools.naveengumaste.me/tools/number-base-converter): Convert numbers across binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). - [Epoch Unix Timestamp Converter](https://unitools.naveengumaste.me/tools/epoch-converter): Convert Unix epoch timestamps (seconds and milliseconds) to human-readable UTC and local date formats. --- ## Image Tools Browser-based visual optimization and graphic manipulation tools running on HTML5 Canvas and Web APIs. - [Image Converter](https://unitools.naveengumaste.me/tools/image-converter): Convert images between PNG, JPG, WebP, AVIF, and GIF without sending files to any server. - [Favicon Generator](https://unitools.naveengumaste.me/tools/favicon-generator): Generate complete favicon bundles (16x16, 32x32, Apple Touch, Android manifest icons) from a single master image. - [Image Compressor](https://unitools.naveengumaste.me/tools/image-compressor): Compress JPEG, PNG, and WebP images client-side while preserving visual clarity. - [Background Remover](https://unitools.naveengumaste.me/tools/background-remover): Extract subjects from photos and generate transparent PNGs. - [Image Resizer](https://unitools.naveengumaste.me/tools/image-resizer): Batch resize images to specific pixel dimensions or aspect ratios with bilinear scaling. - [SVG Editor & Viewer](https://unitools.naveengumaste.me/tools/svg-editor): Inspect, edit, and sanitize Scalable Vector Graphics (SVG) with live visual canvas preview. - [Image to Base64](https://unitools.naveengumaste.me/tools/image-to-base64): Convert image files into Data URI Base64 strings for inline HTML/CSS embedding. --- ## Optional & Related Links - [Complete Documentation & Schema Index](https://unitools.naveengumaste.me/llms-full.txt): Detailed reference of tool behaviors, cheat-sheets, and formats. - [XML Sitemap](https://unitools.naveengumaste.me/sitemap.xml): Machine-readable URL list for search indexers. - [Robots Configuration](https://unitools.naveengumaste.me/robots.txt): Crawler rules and indexing directives.