# ToolsVela — Full Reference > Free, fast, and secure online tools for developers, writers, and everyday productivity. All tools run entirely in your browser — your data never leaves your device. No signup required. ToolsVela (https://www.toolsvela.com) is a privacy-first collection of browser-based utilities for working with text, JSON, images, AI prompts, documents, and more. Every tool is client-side, free, and works offline once loaded. ## About ToolsVela is a single-page Next.js application that bundles 30+ productivity tools behind a hash-router SPA shell. The site is built and maintained as a privacy-respecting alternative to "freemium" tool sites that upload user data to servers, inject ads, or require signup. ### Key facts - **Launched**: 2024 - **Owner**: ToolsVela (independent project) - **Region**: Global (English-language) - **Pricing**: Free forever. No paywall, no ads inside tools. - **Account required**: No - **Data collection**: Google Analytics 4 (anonymous), no PII. Tool data is never uploaded. - **Cookies**: Used only for storing client-side preferences (theme, last-used tab). ### Privacy guarantees - Files you process (text, images, JSON, etc.) stay in your browser. They are never uploaded, transmitted, or logged. - No login means no user accounts to leak or compromise. - We use cookies only for tool preferences. We do not use third-party advertising cookies. - See the [Privacy Policy](https://www.toolsvela.com/#privacy) for the full list of what we do and don't collect. ## Product philosophy - **100% client-side.** Files never leave your browser. No uploads to our servers. - **No signup.** Use any tool instantly without an account. - **Free for everyone.** No paywalls, no quotas, no tracking of personal data. - **Open formats.** Markdown, JSON, CSV, PDF, SVG, PNG, JPG — your files, your way. - **Keyboard-first.** All tools support keyboard shortcuts and tab navigation. - **Dark mode.** All tools respect the system color scheme. ## Architecture - **Framework**: Next.js 16.1.1 with App Router - **Bundler**: Turbopack - **Styling**: Tailwind CSS with custom design tokens - **State management**: React Context for the workspace; per-tool local state otherwise - **Storage**: Browser localStorage for tool data, with optional cookie preferences - **AI pricing data**: Live from OpenRouter API (server-side proxy; only top curated models exposed) - **PDF generation**: Client-side via jspdf (invoice generator) or browser print pipeline (markdown to PDF) - **Markdown rendering**: react-markdown with remark-gfm + rehype-highlight - **Hosting**: Vercel (edge network) - **CDN**: Vercel Edge Network - **Analytics**: Google Analytics 4 only ## Detailed tool catalog ### Text Tools #### Online Notepad - URL: https://www.toolsvela.com/#online-notepad - Description: A clean, distraction-free notepad in your browser. Auto-saves every keystroke to localStorage so you never lose work. Supports multi-tab editing with persistent tabs across sessions. - Key features: Auto-save, multi-tab, dark mode, character/word/line count, export to .txt - Best for: Quick notes, drafting, journaling #### Word Counter - URL: https://www.toolsvela.com/#word-counter - Description: Real-time word, character, sentence, and paragraph counter. Shows reading time estimate. - Best for: Writers, students, content creators tracking length limits (Twitter, essays, etc.) #### Case Converter - URL: https://www.toolsvela.com/#case-converter - Description: Convert text between UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg CaSe, and InVeRsE cAsE. - Best for: Reformatting copy for different contexts #### Text Compare Tool - URL: https://www.toolsvela.com/#text-compare-tool - Description: Side-by-side diff viewer with character, word, or line-level highlighting. - Best for: Code review, document comparison, plagiarism check #### Lorem Ipsum Generator - URL: https://www.toolsvela.com/#lorem-ipsum-generator - Description: Generate placeholder text by paragraph, sentence, or word count. - Best for: Designers and developers prototyping layouts ### Productivity #### Sticky Notes - URL: https://www.toolsvela.com/#sticky-notes-online - Description: Colorful drag-and-drop sticky notes on a virtual board. Auto-saves layout and content. - Best for: Brainstorming, visual task tracking #### Todo List - URL: https://www.toolsvela.com/#todo-list-online - Description: Persistent task list with checkboxes and simple categorization. - Best for: Daily task tracking #### Online Task Manager - URL: https://www.toolsvela.com/#online-task-manager - Description: Kanban-style board for organizing tasks across columns (To Do, In Progress, Done). - Best for: Project management, workflow visualization ### Developer Tools #### JSON Formatter - URL: https://www.toolsvela.com/#json-formatter - Description: Pretty-print, validate, and minify JSON. Tree view, syntax highlighting, error reporting with line numbers. - Best for: API debugging, configuration editing #### Markdown Previewer - URL: https://www.toolsvela.com/#markdown-previewer - Description: Live-rendered Markdown with GitHub-flavored tables, task lists, and code highlighting. #### Markdown to PDF - URL: https://www.toolsvela.com/#markdown-to-pdf - Description: Convert Markdown to PDF with live preview. Page sizes (A4, Letter, Legal), margins (Narrow/Default/Wide), GFM tables, syntax-highlighted code blocks. Uses the browser's print pipeline for selectable, searchable text in the final PDF. - Best for: Articles, documentation, notes #### HTML/CSS/JS Compressor - URL: https://www.toolsvela.com/#html-css-js-compressor - Description: Minify HTML, CSS, and JavaScript. Also decompresses (formats) them. - Best for: Frontend performance optimization #### Regex Tester - URL: https://www.toolsvela.com/#regex-tester - Description: Build and test regular expressions with real-time matching and capture groups. #### Color Contrast Checker - URL: https://www.toolsvela.com/#color-contrast-checker - Description: Check WCAG contrast ratios between two colors for accessibility compliance. #### CSV to JSON Converter - URL: https://www.toolsvela.com/#csv-to-json-converter - Description: Bidirectional conversion between CSV and JSON with delimiter and header support. #### Hash Generator - URL: https://www.toolsvela.com/#hash-generator - Description: Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files. #### Gradient Generator - URL: https://www.toolsvela.com/#gradient-generator - Description: Build CSS gradients visually with linear/radial options and presets. #### JWT Decoder - URL: https://www.toolsvela.com/#jwt-decoder - Description: Decode and inspect JSON Web Tokens. View header and payload data. ### Image Tools #### Image Resizer - URL: https://www.toolsvela.com/#image-resizer-online - Description: Resize images to custom dimensions in the browser. Supports PNG, JPG, WebP. - Best for: Quick image dimension changes without uploading #### Base64 Image Converter - URL: https://www.toolsvela.com/#base64-image-converter - Description: Convert images to Base64 strings and decode Base64 back to images. ### Converters #### PDF Converter - URL: https://www.toolsvela.com/#converter - Description: Convert text, images, or Word documents into a PDF. - Best for: Quick PDF generation #### Markdown to PDF - URL: https://www.toolsvela.com/#markdown-to-pdf - See above. #### File Size Converter - URL: https://www.toolsvela.com/#file-size-converter - Description: Convert between bytes, KB, MB, GB, TB, PB. #### Unit Converter - URL: https://www.toolsvela.com/#unit-converter - Description: Convert between common units of length, weight, temperature, etc. #### RGB to Hex / Hex to RGB Converter - URL: https://www.toolsvela.com/#rgb-to-hex-converter / https://www.toolsvela.com/#hex-to-rgb-converter - Description: Color format conversion. #### Base64 Text Encoder - URL: https://www.toolsvela.com/#base64-text-encoder - Description: Encode and decode text in Base64 format. ### Time & Date #### Pomodoro Timer - URL: https://www.toolsvela.com/#pomodoro-timer - Description: Productivity timer with work/break intervals and cycle tracking. #### Countdown Timer - URL: https://www.toolsvela.com/#countdown-timer - Description: Customizable countdown to any date or time. #### Age Calculator - URL: https://www.toolsvela.com/#age-calculator - Description: Calculate exact age in years, months, days, hours. #### Time Zone Difference - URL: https://www.toolsvela.com/#time-zone-difference - Description: Calculate time gap between two zones. ### Math & Health #### Percentage Calculator - URL: https://www.toolsvela.com/#percentage-calculator - Description: Calculate percentages, percentage increase/decrease, ratio conversions. #### BMI Calculator - URL: https://www.toolsvela.com/#bmi-calculator - Description: Calculate Body Mass Index for health tracking. ### Utility #### QR Code Generator - URL: https://www.toolsvela.com/#qr-code-generator - Description: Generate QR codes for URLs, text, and more. Download as PNG/SVG. #### Password Generator - URL: https://www.toolsvela.com/#password-generator - Description: Generate strong, secure passwords with customizable length and character types. ### Business #### Invoice Generator - URL: https://www.toolsvela.com/#invoice-generator - Description: Build, preview, and download branded invoices as PDF. Features include: - Logo upload (PNG/JPG/SVG) - Multi-currency support (29 currencies) - Line items with quantity × unit price - Tax rate, shipping, discount, advance payment - Balance due calculation - Bank details section - Auto-saved company profile (logo, "From" details, bank info, currency) so you don't retype info for every invoice - Best for: Freelancers, small businesses, contractors ### AI Tools (2025+) #### Tokenizer - URL: https://www.toolsvela.com/#tokenizer - Description: Estimate token count and cost for OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek models. Live pricing fetched from OpenRouter. Sortable by latest/oldest/price/context. #### Prompt Diff Viewer - URL: https://www.toolsvela.com/#prompt-diff-viewer - Description: Compare two prompts with word-level diff highlighting. #### System Prompt Builder - URL: https://www.toolsvela.com/#system-prompt-builder - Description: Click-to-add building blocks for LLM system prompts. #### Temperature Visualizer - URL: https://www.toolsvela.com/#temperature-visualizer - Description: See how temperature affects softmax probability distributions. #### Context Window Calculator - URL: https://www.toolsvela.com/#context-window-calculator - Description: Check how much context space a model has and how much you've used. #### Words to AI Models Token Calculator - URL: https://www.toolsvela.com/#words-token-calculator - Description: Estimate LLM cost from word counts (input + output) across top AI models. Live pricing. No need to write the actual text — perfect for planning blog posts, essays, or reports before writing them. - Best for: Estimating cost before committing to a large prompt or response #### Bias Word Highlighter - URL: https://www.toolsvela.com/#bias-word-highlighter - Description: Flag loaded, vague, or biased words in prompts to improve LLM output quality. #### Few-Shot Formatter - URL: https://www.toolsvela.com/#few-shot-formatter - Description: Format example pairs as XML, JSON, Markdown, or YAML for few-shot prompting. #### LLM Output Tester - URL: https://www.toolsvela.com/#llm-output-tester - Description: Test regex extraction patterns against sample LLM outputs with live matching and groups. ## Frequently asked questions ### Is ToolsVela really free? Yes. Every tool is free, with no signup required. We don't display ads inside tools and we don't sell user data. ### Do you upload my files? No. Every tool processes your data in your browser using JavaScript. Files never leave your device. You can verify this by opening the browser's Network tab — no upload requests are made. ### Do I need to create an account? No. ToolsVela has no signup flow. You can use every tool immediately without registration. ### Do you have a mobile app? Currently ToolsVela is a responsive web app only. It works in mobile browsers but is not packaged as a native app. ### How do you make money? ToolsVela is independently run. We may display non-intrusive contextual recommendations in the future, but never inside the tool workspaces themselves. ### Can I use ToolsVela offline? Once a tool page is loaded, basic functionality works offline. Some tools (like the Markdown to PDF, the Words Token Calculator, the Invoice Generator) require an initial network connection to load their assets. ### Where is my data stored? All tool data is stored in your browser's localStorage. Clearing your browser data will reset the tools. ### Can I export my data? Yes. The Online Notepad supports exporting to .txt. Most other tools let you copy results to your clipboard. ## Static pages - [Home](https://www.toolsvela.com/): Browse all tools by category - [Privacy Policy](https://www.toolsvela.com/#privacy): How we handle (don't handle) your data - [Terms of Service](https://www.toolsvela.com/#terms): Standard usage terms ## Optional resources - [Sitemap](https://www.toolsvela.com/sitemap.xml): Full list of pages - [robots.txt](https://www.toolsvela.com/robots.txt): Crawler directives