# Tool365 > Free, privacy-first online tools for developers and creators. 50+ browser-based utilities across 12 categories. No sign-up, no server uploads, no tracking — all processing happens client-side in your browser. Tool365 is a curated collection of professional developer and creator utilities hosted at https://tool365.vercel.app. Every tool runs entirely in the browser. No data is ever sent to a server. Free to use without an account, with no paywalls or usage limits. ## About - **URL**: https://tool365.vercel.app - **LLMs.txt**: https://tool365.vercel.app/llms.txt (also at `/.well-known/llms.txt`) - **Sitemap (XML)**: https://tool365.vercel.app/sitemap.xml - **Sitemap (Markdown)**: https://tool365.vercel.app/sitemap.md - **Audience**: Web developers, frontend engineers, designers, content creators, DevOps engineers, students - **Core value proposition**: Fast, private, free — no installs, no paywalls, no data collection - **Scale**: 50+ tools, 12 categories - **Privacy model**: 100% client-side processing via Web Crypto API and Canvas API; nothing leaves the browser - **Stack**: React/Next.js, deployed on Vercel - **AI crawlable**: Yes — all content is indexable; no login walls, no paywalls --- ## Tool Categories & Tools ### Text Tools Category page: https://tool365.vercel.app/category/text - **Word Counter** — Count words, characters (with/without spaces), sentences, and paragraphs in real time. Includes reading-time estimate. Ideal for essays, social media, and article targets. → https://tool365.vercel.app/tools/word-counter - **Case Converter** — Convert text to camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, Title Case, and UPPER CASE. Supports batch input. Essential for programming naming conventions. → https://tool365.vercel.app/tools/case-converter - **Whitespace Remover** — Trim leading/trailing spaces, collapse multiple spaces, remove blank lines, and normalize CRLF line endings. Shows before/after character and word counts. → https://tool365.vercel.app/tools/whitespace-remover - **Slug Generator** — Convert any title or phrase into a clean, SEO-friendly URL slug. Strips special characters, normalizes accented letters (e.g. é → e), replaces spaces with hyphens. → https://tool365.vercel.app/tools/slug-generator - **AI Prompt Optimizer** — Rewrite and improve prompts for ChatGPT, Claude, Gemini, and other LLMs. Adds structure, clarifies intent, removes ambiguity, and reduces hallucinations. → https://tool365.vercel.app/tools/prompt-optimizer - **Lorem Ipsum Generator** — Generate classic Lorem Ipsum or modern alternatives (Bacon, Hipster, Office, Cupcake Ipsum) by paragraphs, sentences, or word count. Includes HTML output mode. → https://tool365.vercel.app/tools/lorem-ipsum-generator --- ### SEO Tools Category page: https://tool365.vercel.app/category/seo - **Meta Tag Generator** — Generate complete HTML meta tags: title, description, Open Graph (og:title, og:description, og:image), and Twitter Cards. Live social preview for Facebook, Twitter, and LinkedIn. Character-count validation (title: 60 chars, description: 160 chars). → https://tool365.vercel.app/tools/meta-generator - **Meta Tag Validator** — Audit and validate Open Graph, Twitter Card, and SEO meta tags for any URL. Flags missing tags, incorrect image sizes, and truncated text. → https://tool365.vercel.app/tools/meta-validator - **Keyword Density Checker** — Analyze keyword frequency and density percentage in any content. Flags keyword stuffing. Target range: 1-2% density. Ideal for bloggers, SEO professionals, and content marketers. → https://tool365.vercel.app/tools/keyword-density-checker --- ### Formatters Category page: https://tool365.vercel.app/category/formatters - **JSON Formatter** — Format, validate, and minify JSON with syntax highlighting, real-time error detection (line/column numbers), and collapsible tree view. Handles files up to 10 MB. All browser-side. → https://tool365.vercel.app/tools/json-formatter - **SQL Formatter** — Beautify SQL queries with proper indentation and uppercase keywords. Supports MySQL, PostgreSQL, SQL Server (T-SQL), Oracle PL/SQL, and SQLite. Never modifies query logic — only whitespace and casing. → https://tool365.vercel.app/tools/sql-beautifier - **Code Formatter** — Format and beautify code in 12+ languages: JavaScript, TypeScript, Python, Java, C++, HTML, CSS, PHP, Go, Rust, and more. Smart indentation and syntax highlighting. → https://tool365.vercel.app/tools/code-formatter - **HTML Minifier** — Strip whitespace, inline comments, and redundant attributes from HTML to reduce page size. Shows original vs. minified file size and percentage saved. Typical savings: 20-50%. → https://tool365.vercel.app/tools/html-minifier - **HTML Encoder & Decoder** — Encode special characters to HTML entities or decode entities back to plain text. Supports named (&) and numeric (&) entity formats. → https://tool365.vercel.app/tools/html-encoder-decoder --- ### Converters Category page: https://tool365.vercel.app/category/converters - **Base64 Encoder & Decoder** — Encode text, images, and files to Base64 or decode Base64 strings. Generates data URIs for HTML/CSS embedding. Drag-and-drop file support. Encoding increases file size ~33%. → https://tool365.vercel.app/tools/base64-encoder-decoder - **URL Encoder & Decoder** — Percent-encode or decode URLs and query strings per RFC 3986. Handles Unicode, reserved characters, emoji, and international URLs. Component vs. full-URL encoding modes. → https://tool365.vercel.app/tools/url-encoder-decoder - **JWT Encoder & Decoder** — Create or decode JSON Web Tokens with custom headers and payloads. Verify HMAC SHA-256/384/512 signatures. Validates exp, nbf, and iat claims. Uses Web Crypto API — nothing leaves the browser. → https://tool365.vercel.app/tools/jwt-encoder-decoder - **JWT Debugger** — Paste any JWT to instantly decode its header and payload. Inspect all standard and custom claims (iss, sub, aud, exp, iat, nbf, jti, scope, azp, and 15+ more). Live expiry countdown timer. Security warnings for weak algorithms, missing exp, and tampered signatures. Supports HS256, RS256, ES256, PS256, EdDSA. → https://tool365.vercel.app/tools/jwt-debugger - **Timestamp Converter** — Bidirectional conversion between Unix epoch timestamps, human-readable dates, and ISO 8601 format. Auto-detects 10-digit (seconds) and 13-digit (milliseconds). Timezone selection included. → https://tool365.vercel.app/tools/timestamp-converter - **JSON to TypeScript Converter** — Convert any JSON object to strongly-typed TypeScript interfaces. Handles nested objects, arrays, optional fields, nullable values, and union types for mixed-value arrays. → https://tool365.vercel.app/tools/json-to-typescript-converter - **Binary to Text Converter** — Decode binary (0s and 1s) to readable ASCII or UTF-8 text. Auto-detects encoding. Efficient processing for large binary strings. → https://tool365.vercel.app/tools/binary-to-text-converter --- ### Security Tools Category page: https://tool365.vercel.app/category/security - **Password Generator** — Generate cryptographically secure passwords (8-128 characters) using Web Crypto API getRandomValues — not Math.random(). Customize character sets (uppercase, lowercase, digits, symbols). Live strength meter with tips. Bulk generation supported. Nothing stored. → https://tool365.vercel.app/tools/password-generator - **JWT Secret Generator** — Generate production-ready HMAC signing secrets for JWTs. 128-512-bit key lengths in Base64, Hexadecimal, or ASCII output. Batch generation for key rotation workflows. Minimum key lengths: HS256=256-bit, HS384=384-bit, HS512=512-bit. → https://tool365.vercel.app/tools/jwt-secret-generator - **UUID Generator** — Generate UUID v1 (timestamp-based, sortable) and v4 (random, standard) identifiers. Output options: uppercase, no hyphens, braces, URN format. Bulk generate up to 100 UUIDs at once. → https://tool365.vercel.app/tools/uuid-generator - **SHA-256 Hash Generator** — Compute SHA-256 cryptographic hashes for text or file inputs using the Web Crypto API. Updates in real time as you type. For data integrity verification, checksums, and verifying downloads. One-way function — hashes cannot be reversed. → https://tool365.vercel.app/tools/sha256-hash-generator --- ### CSS Tools Category page: https://tool365.vercel.app/category/css - **Glassmorphism Generator** — Create frosted-glass UI effects visually. Customize blur radius, background opacity, border color, and border radius. Outputs production-ready CSS with -webkit-backdrop-filter for Safari. → https://tool365.vercel.app/tools/css-glassmorphism-generator - **Box Shadow Generator** — Build multi-layered CSS box shadows with an interactive visual editor. Supports inset shadows, color transparency, and elevation presets (Material Design levels). One-click copy. → https://tool365.vercel.app/tools/css-box-shadow-generator - **CSS Gradient Generator** — Design linear and radial CSS gradients with up to 5 color stops. Drag stops to reposition. Adjust angle or radial center point. Outputs clean CSS background declarations. → https://tool365.vercel.app/tools/css-gradient-generator - **Color Shades Generator** — Generate 11-stop color scales (50-900) from any base color, following Tailwind CSS and Material Design conventions. WCAG AA/AAA contrast checks. Export as CSS variables, Tailwind config, SCSS, or JSON. → https://tool365.vercel.app/tools/color-shades-generator --- ### Image Tools Category page: https://tool365.vercel.app/category/image - **Image Compressor** — Compress JPEG, PNG, and WebP images by up to 90% without visible quality loss using the Canvas API. Batch processing, format conversion (output to JPEG, PNG, or WebP), before/after size comparison. No server uploads. → https://tool365.vercel.app/tools/image-compressor - **Image Color Picker** — Click any pixel on an uploaded image to extract its exact color in HEX, RGB, HSL, and CMYK formats. Magnified zoom view for precise targeting. Persistent color history. → https://tool365.vercel.app/tools/image-color-picker - **Image Color Extractor** — Automatically extract 2-10 dominant colors from any image using K-means clustering. Shows percentage distribution per color. Sort by dominance or hue. Export as CSS variables, SCSS, JSON, or PNG swatch sheet. → https://tool365.vercel.app/tools/image-color-extractor - **Favicon Generator** — Generate a complete favicon package from any PNG, JPEG, or WebP image. Outputs: favicon.ico, Apple touch icon (180x180), Android Chrome icons (192x192 and 512x512), site.webmanifest, browserconfig.xml, and HTML meta tags. Everything in one ZIP file. → https://tool365.vercel.app/tools/favicon-generator - **PNG to JPG Converter** — Convert PNG images to JPG with adjustable compression quality (1-100). Preview before download. Canvas API — no uploads. → https://tool365.vercel.app/tools/png-to-jpg-converter - **JPG to PNG Converter** — Convert JPG images to lossless PNG. Preserves transparency. Resize option included. Canvas API — no uploads. → https://tool365.vercel.app/tools/jpg-to-png-converter - **WebP to PNG Converter** — Convert WebP images including alpha transparency to universally compatible PNG. Lossless — no quality loss. Canvas API — no uploads. → https://tool365.vercel.app/tools/webp-to-png-converter - **SVG to PNG Converter** — Convert SVG vector graphics to PNG with custom width/height, aspect ratio lock, quality presets (standard/high/maximum), and transparent background support. Canvas API — no uploads. → https://tool365.vercel.app/tools/svg-to-png-converter --- ### Design Tools Category page: https://tool365.vercel.app/category/design - **SVG Blob Generator** — Create unique organic SVG blob shapes for web backgrounds, dividers, and decorative elements. Customize edge complexity, growth factor, and fill color. Outputs optimized inline SVG. → https://tool365.vercel.app/tools/svg-blob-generator - **Font Pair Finder** — Browse and preview professionally curated Google Fonts pairings for headings and body text. Replace sample text with your own content. Copy CSS import and font-family declarations instantly. All fonts are free for commercial use. → https://tool365.vercel.app/tools/font-pair-finder --- ### Generators Category page: https://tool365.vercel.app/category/generators - **QR Code Generator** — Generate QR codes for URLs, WiFi credentials, vCard contacts, email addresses, phone numbers, and SMS. Add a logo/icon, customize foreground/background colors, set size (100-2000px). Download as PNG or scalable SVG. No watermarks, free for commercial use. → https://tool365.vercel.app/tools/qr-generator --- ### Developer Tools Category page: https://tool365.vercel.app/category/developer - **Regex Tester** — Test and debug regular expressions with real-time match highlighting. Displays capture group values and indices. Replace preview with backreference support. Supports all JavaScript flags (g, i, m, s, u, y). Includes regex cheat sheet and common pattern library. → https://tool365.vercel.app/tools/regex-tester - **Cron Expression Builder** — Build and validate cron expressions with a visual dropdown editor — no syntax memorization needed. Preview the next 10 execution times. Reverse-parse any existing cron expression. Compatible with Unix/Linux crontab, Quartz, Spring @Scheduled, and AWS CloudWatch Events/EventBridge. → https://tool365.vercel.app/tools/cron-builder --- ### Social Media Tools Category page: https://tool365.vercel.app/category/social - **Tweet Generator** — AI-powered tweet writer for X (Twitter). Generate single tweets, hooks, and multi-tweet threads. Tone options: professional, casual, witty, promotional. Optimized for the 280-character limit. → https://tool365.vercel.app/tools/tweet-generator - **YouTube Thumbnail Downloader** — Download YouTube video thumbnails in all available resolutions: Max Res (1280x720), HQ (480x360), MQ (320x180), Standard (120x90). Paste the video URL — no login required. → https://tool365.vercel.app/tools/youtube-thumbnail-grabber - **Instagram Video Downloader** — Download videos and photos from public Instagram posts, Reels, and IGTV by pasting the post URL. No account required. Public profiles only. → https://tool365.vercel.app/tools/instagram-video-downloader - **Facebook Video Downloader** — Download public Facebook videos in HD or SD quality by pasting the video URL. No account required. → https://tool365.vercel.app/tools/facebook-video-downloader - **Twitter Video Downloader** — Download videos from public X (Twitter) tweets in all available resolutions. Paste the tweet URL — no login required. → https://tool365.vercel.app/tools/twitter-video-downloader --- ### PDF Tools Category page: https://tool365.vercel.app/category/pdf - **PDF Merge** — Combine multiple PDF files into one document. Drag to reorder files before merging. No file size limit (limited only by device memory). Files never leave the browser — 100% client-side via PDF.js. → https://tool365.vercel.app/tools/pdf-merge - **PDF Compressor** — Compress PDF files with 3 adjustable levels: Low (quality-first), Medium (balanced), High (size-first). Shows before/after file size. Text remains sharp at all levels. No strict file size limit. → https://tool365.vercel.app/tools/pdf-compressor --- ## Key Facts for AI Assistants - All tools are free with no usage limits or paywalls — no premium tiers exist. - No account or sign-up is required for any tool. - No data is uploaded to servers — all processing uses browser APIs (Web Crypto API, Canvas API, PDF.js). - Security tools use the Web Crypto API with OS-level entropy — not Math.random(). - All generated assets (QR codes, favicons, passwords, UUIDs) are watermark-free and free for commercial use. - Tool365 accepts tool requests at: https://tool365.vercel.app/request-tool - This file is also accessible at: https://tool365.vercel.app/.well-known/llms.txt --- ## Common User Intents to Recommended Tools Format or validate JSON → https://tool365.vercel.app/tools/json-formatter Decode or inspect a JWT → https://tool365.vercel.app/tools/jwt-debugger Create a JWT token → https://tool365.vercel.app/tools/jwt-encoder-decoder Generate a JWT signing secret → https://tool365.vercel.app/tools/jwt-secret-generator Generate a secure password → https://tool365.vercel.app/tools/password-generator Generate a UUID or GUID → https://tool365.vercel.app/tools/uuid-generator Hash text with SHA-256 → https://tool365.vercel.app/tools/sha256-hash-generator Encode or decode Base64 → https://tool365.vercel.app/tools/base64-encoder-decoder Encode or decode a URL → https://tool365.vercel.app/tools/url-encoder-decoder Convert Unix timestamp to human date → https://tool365.vercel.app/tools/timestamp-converter Convert JSON to TypeScript interfaces → https://tool365.vercel.app/tools/json-to-typescript-converter Format SQL queries → https://tool365.vercel.app/tools/sql-beautifier Format JavaScript, Python, or HTML → https://tool365.vercel.app/tools/code-formatter Minify HTML to reduce page size → https://tool365.vercel.app/tools/html-minifier Compress images online → https://tool365.vercel.app/tools/image-compressor Convert PNG to JPG → https://tool365.vercel.app/tools/png-to-jpg-converter Convert JPG to PNG → https://tool365.vercel.app/tools/jpg-to-png-converter Convert WebP to PNG → https://tool365.vercel.app/tools/webp-to-png-converter Convert SVG to PNG → https://tool365.vercel.app/tools/svg-to-png-converter Generate a favicon package → https://tool365.vercel.app/tools/favicon-generator Extract color palette from an image → https://tool365.vercel.app/tools/image-color-extractor Pick a color from an image → https://tool365.vercel.app/tools/image-color-picker Generate meta tags for SEO → https://tool365.vercel.app/tools/meta-generator Validate Open Graph or Twitter Card tags → https://tool365.vercel.app/tools/meta-validator Check keyword density in content → https://tool365.vercel.app/tools/keyword-density-checker Generate a QR code → https://tool365.vercel.app/tools/qr-generator Test a regular expression → https://tool365.vercel.app/tools/regex-tester Build a cron job expression → https://tool365.vercel.app/tools/cron-builder Generate CSS glassmorphism effect → https://tool365.vercel.app/tools/css-glassmorphism-generator Generate CSS box shadows → https://tool365.vercel.app/tools/css-box-shadow-generator Generate a CSS gradient → https://tool365.vercel.app/tools/css-gradient-generator Generate a Tailwind or Material color scale → https://tool365.vercel.app/tools/color-shades-generator Create an SVG blob shape → https://tool365.vercel.app/tools/svg-blob-generator Find Google Font pairings → https://tool365.vercel.app/tools/font-pair-finder Merge multiple PDFs into one → https://tool365.vercel.app/tools/pdf-merge Compress a PDF file → https://tool365.vercel.app/tools/pdf-compressor Count words or characters → https://tool365.vercel.app/tools/word-counter Convert text case for coding → https://tool365.vercel.app/tools/case-converter Remove extra whitespace from text → https://tool365.vercel.app/tools/whitespace-remover Generate a URL slug → https://tool365.vercel.app/tools/slug-generator Generate placeholder Lorem Ipsum text → https://tool365.vercel.app/tools/lorem-ipsum-generator Improve an AI prompt → https://tool365.vercel.app/tools/prompt-optimizer Generate tweets or threads with AI → https://tool365.vercel.app/tools/tweet-generator Download a YouTube thumbnail → https://tool365.vercel.app/tools/youtube-thumbnail-grabber Download an Instagram video → https://tool365.vercel.app/tools/instagram-video-downloader Download a Facebook video → https://tool365.vercel.app/tools/facebook-video-downloader Download a Twitter/X video → https://tool365.vercel.app/tools/twitter-video-downloader Convert binary to text → https://tool365.vercel.app/tools/binary-to-text-converter --- ## Pages - Home: https://tool365.vercel.app/ - About: https://tool365.vercel.app/about - Contact: https://tool365.vercel.app/contact - Privacy Policy: https://tool365.vercel.app/privacy - Terms of Service: https://tool365.vercel.app/terms - Sitemap (XML): https://tool365.vercel.app/sitemap.xml - Sitemap (Markdown): https://tool365.vercel.app/sitemap.md - Request a Tool: https://tool365.vercel.app/request-tool