Published February 23, 2026 · 25 min read
Every developer has the same problem: you need a quick tool for a specific task, and every search result wants your email before you can use it. A JSON formatter that requires a login. A regex tester behind a paywall. An image compressor that watermarks the output until you subscribe.
That entire model is broken. The best developer tools in 2026 work instantly in your browser -- no signup, no credit card, no tracking pixels following you around the internet. You open the page, do what you need to do, and close the tab. That is how tools should work.
This is the definitive list. We built and curated over 75 free tools that cover every category a developer, designer, or founder touches daily. Every tool listed here is free, runs client-side, and requires zero accounts. Bookmark this page -- it is the only tools list you will need this year.
JSON is the backbone of modern web development. Whether you are debugging API responses, transforming datasets, or validating configuration files, you need fast, reliable JSON tools that do not add friction to your workflow.
Paste minified or messy JSON, get perfectly indented, syntax-highlighted output instantly. Supports nested objects, arrays, and large payloads. Detects and highlights errors with line numbers. Copy formatted output with one click.
Use it free →Validates JSON against RFC 8259 specification. Pinpoints exact error locations with descriptive messages. Catches common issues like trailing commas, unquoted keys, and mismatched brackets that other validators miss.
Use it free →Converts JSON arrays and nested objects into clean CSV files ready for Excel, Google Sheets, or database imports. Handles nested data by flattening keys with dot notation. Download the result as a .csv file instantly.
Use it free →Formats raw SQL queries into readable, properly indented code. Supports SELECT, INSERT, UPDATE, DELETE, JOINs, subqueries, and CTEs. Essential for debugging complex queries and making code reviews productive.
Use it free →Minification reduces file sizes by stripping whitespace, comments, and unnecessary characters. Every kilobyte matters for page load speed, Core Web Vitals, and SEO rankings. These tools handle it instantly without build pipelines.
Strips comments, collapses whitespace, removes optional tags, and minifies inline CSS/JS. Reduces HTML file sizes by 15-40% on average. Paste your markup, get optimized output in milliseconds.
Use it free →Removes comments, collapses whitespace, shortens color values, and optimizes selectors. Handles complex CSS including media queries, keyframe animations, and CSS custom properties. Shows compression ratio.
Use it free →Side-by-side comparison of two text blocks with highlighted additions, deletions, and modifications. Essential for code reviews, comparing config files, or verifying deployment changes. Supports syntax highlighting for common languages.
Use it free →Write and execute HTML, CSS, and JavaScript in a live browser environment. Real-time preview updates as you type. No build step, no framework setup. Perfect for prototyping, learning, and sharing code snippets.
Use it free →Regular expressions are powerful but notoriously hard to get right. Testing regex patterns against live data with instant visual feedback eliminates the guess-and-check cycle that wastes hours of development time.
Test regular expressions against sample text with real-time match highlighting. Shows capture groups, match indices, and flag options. Supports JavaScript, Python, and PCRE-style regex syntax. Explains what each part of your pattern does.
Use it free →A complete reference for regular expression syntax. Covers character classes, quantifiers, anchors, lookaheads, lookbehinds, named groups, and flags with examples for each. Searchable and organized by category.
Use it free →Counts words, characters, sentences, and paragraphs in real time. Displays reading time estimates. Essential for blog posts, meta descriptions, social media copy, and any text with length requirements.
Use it free →Generates placeholder text in paragraphs, sentences, or words. Customizable output length. Useful for design mockups, frontend development, and testing layouts before real content is available.
Use it free →Every tool on this list is available as deployable source code. Buy once, own forever. Deploy to your own domain in 60 seconds.
$9.99 -- Source Bundle Reseller LicenseTesting APIs without Postman or Insomnia is possible. Browser-based API tools let you fire requests, inspect responses, and debug webhooks without installing anything. They are especially useful on shared machines or when you need a quick test without launching a full development environment.
Send GET, POST, PUT, PATCH, and DELETE requests to any endpoint. Set custom headers, body content (JSON, form data, raw), and authentication. View response headers, status codes, timing, and formatted response bodies. A lightweight Postman alternative in the browser.
Use it free →Generate a unique webhook URL and inspect incoming HTTP requests in real time. See headers, body, query parameters, and method for each request. Essential for debugging payment callbacks, CI/CD hooks, and third-party integrations.
Use it free →Enter any URL and inspect its HTTP response headers. Checks for security headers (CSP, HSTS, X-Frame-Options), caching directives, CORS configuration, and server information. Flags missing security headers with recommendations.
Use it free →Data encoding and format conversion are daily tasks for any developer working with APIs, databases, or web services. These tools handle the tedious conversions so you can focus on actual logic.
Encode text or files to Base64 and decode Base64 strings back to their original form. Handles UTF-8 text, images, PDFs, and binary data. Copy output with one click or download decoded files directly.
Use it free →Encode special characters for safe use in URLs and query strings, or decode percent-encoded URLs back to readable text. Handles Unicode characters, spaces, ampersands, and other reserved characters correctly.
Use it free →Generates RFC 4122 compliant UUIDs (v4) using cryptographically secure random number generation. Generate single UUIDs or bulk batches. Copy to clipboard instantly. No data is stored or transmitted.
Use it free →Convert between Unix timestamps, ISO 8601, and human-readable date formats. Handles millisecond and second precision. Shows current timestamp, supports timezone conversions, and parses relative dates.
Use it free →Converts any text into a URL-friendly slug. Handles Unicode, strips special characters, converts spaces to hyphens, and lowercases everything. Essential for blog platforms, CMS systems, and routing.
Use it free →Search engine optimization starts with proper meta tags, structured data, and technical configuration. These tools generate the exact code you need to paste into your HTML. No SEO expertise required -- the tools handle the specification compliance.
Generates complete meta tag sets including title, description, Open Graph, Twitter Cards, and canonical URLs. Preview how your page will appear in Google search results. Copy the entire block and paste into your HTML head.
Use it free →Preview exactly how your page will appear when shared on Facebook, Twitter, LinkedIn, and Slack. Test Open Graph tags in real time. Catch issues before your content goes live and gets shared with broken previews.
Use it free →Generate a properly formatted robots.txt file with allow/disallow rules, crawl delay, and sitemap references. Includes presets for common configurations and explanations of what each directive does.
Use it free →Creates XML sitemaps that follow the Sitemaps.org protocol. Add URLs with priority, change frequency, and last modified dates. Export and upload to your server or submit directly to Google Search Console.
Use it free →Measure your website's loading performance including TTFB, FCP, LCP, and total load time. Identifies bottlenecks in resource loading. Shows optimization recommendations specific to your site.
Use it free →Monitor any URL's availability and response time. Get notified when your site goes down. Track uptime history and response time trends. Essential for production deployments and client sites.
Use it free →Use the Meta Generator for on-page tags, the OG Preview to verify social sharing, the Robots.txt Generator for crawl control, the Sitemap Generator for indexing, and the Speed Test for performance -- all in one workflow, all free. Read our full 50 SEO Tips to Rank Fast guide for more.
CSS tooling has evolved beyond text editors. Visual generators for gradients, flexbox layouts, grid systems, and color palettes eliminate the trial-and-error cycle. These tools generate production-ready CSS you can copy directly into your stylesheet.
Create linear, radial, and conic gradients with a visual editor. Drag color stops, adjust angles, and preview in real time. Generates cross-browser CSS with fallbacks. Save and export gradients for your design system.
Use it free →Visual builder for CSS flexbox layouts. Set container properties (direction, wrap, justify, align) and item properties (order, grow, shrink, basis) with live preview. Generates clean, production-ready CSS.
Use it free →Create complex CSS Grid layouts visually. Define rows, columns, gaps, and template areas by dragging. Handles named grid lines, auto-fill, minmax, and responsive breakpoints. Outputs clean grid CSS.
Use it free →Generate harmonious color palettes using color theory algorithms. Supports complementary, analogous, triadic, split-complementary, and custom schemes. Export as CSS variables, Tailwind config, or Figma-ready values.
Use it free →Convert between HEX, RGB, HSL, HSB, and CMYK color formats. Real-time preview with accessibility contrast information. Handles shorthand hex, rgba with alpha, and CSS named colors.
Use it free →Test foreground and background color combinations against WCAG 2.1 AA and AAA accessibility standards. Shows contrast ratios for normal text, large text, and UI components. Suggests passing alternatives for failing combinations.
Use it free →Create complete brand color schemes from a single base color. Generates primary, secondary, accent, neutral, success, warning, and error colors. Outputs CSS variables ready to paste into your stylesheet.
Use it free →Discover which fonts work together. Browse curated combinations of heading and body fonts from Google Fonts. Preview pairings with your own text. Copy the Google Fonts import link and CSS.
Use it free →Image optimization, favicon creation, and placeholder generation are essential for every web project. These tools process everything in the browser using WebAssembly and Canvas APIs -- your files never leave your device.
Compress JPEG, PNG, WebP, and GIF images without visible quality loss. Uses advanced compression algorithms running locally in your browser. Process multiple files at once. Typical reduction: 40-80% file size savings.
Use it free →Generate favicons in all required sizes (16x16, 32x32, 180x180, 512x512) from a single image. Creates ICO, PNG, and Apple Touch Icon formats. Includes the HTML link tags to paste into your head element.
Use it free →Generate placeholder images in any dimension with custom colors and text. Useful for wireframes, design mockups, and frontend development before final assets are ready. Download as PNG or use the direct URL.
Use it free →Create and edit SVG graphics in the browser. Draw shapes, paths, and text. Modify attributes visually. Export optimized SVG code ready for web use. A lightweight alternative to Illustrator for simple vector work.
Use it free →Generate QR codes for URLs, text, Wi-Fi credentials, contact cards, and more. Customize size, color, and error correction level. Download as PNG or SVG. No tracking pixels embedded in generated codes.
Use it free →Merge, split, compress, and convert PDF files entirely in the browser. Combine multiple PDFs into one, extract specific pages, or reduce file size for email. No file size limits, no watermarks, no signup.
Use it free →SpunkArt was built with these exact tools. Get the full source code bundle and deploy your own tools site in a single afternoon. Includes all 75+ tools with source code.
$9.99 -- Get the Bundle Reseller LicenseSocial media marketing requires creating content optimized for each platform. These tools generate hashtags, tweets, social bios, and email signatures formatted to each platform's specifications.
Create eye-catching social media cards with custom text, colors, and layouts. Export as images optimized for Twitter, Facebook, LinkedIn, and Instagram. No design skills required -- pick a template and customize.
Use it free →Enter a topic and get relevant, trending hashtags for Instagram, Twitter, TikTok, and LinkedIn. Shows popularity scores and suggests niche-specific tags that improve discoverability without looking spammy.
Use it free →Craft tweets with character count, thread formatting, and preview. Test how your tweet will look before posting. Supports threads, mentions, and hashtag optimization for maximum reach.
Use it free →Generate professional bios for Twitter, Instagram, LinkedIn, and TikTok. Enter your role and interests, get multiple bio options tailored to each platform's character limits and conventions.
Use it free →Plan and schedule your social media content across platforms. Track posting frequency, content themes, and engagement windows. Export your calendar as a spreadsheet for team collaboration.
Use it free →Create professional HTML email signatures with your name, title, company, social links, and branding. Generates clean, cross-client compatible HTML that works in Gmail, Outlook, Apple Mail, and Thunderbird.
Use it free →Generate responsive YouTube embed codes with custom parameters. Control autoplay, loop, start time, controls visibility, and privacy-enhanced mode. Outputs lazy-loaded iframes for better page performance.
Use it free →Launching a product or freelance business requires legal documents, pricing strategies, and business planning tools. Hiring a lawyer for a privacy policy costs $500-2,000. These generators produce professional documents in minutes at zero cost.
Create professional invoices with line items, tax calculations, discounts, and payment terms. Export as PDF. Includes fields for your branding, client details, and bank information. No account required -- generate and download.
Use it free →Generate freelance contracts, NDA agreements, and service agreements using customizable templates. Fill in the parties, terms, and scope. Download as PDF. Not a substitute for legal advice, but a solid starting point.
Use it free →Generate GDPR and CCPA compliant privacy policies by answering questions about your data collection practices. Covers cookies, analytics, third-party services, and user rights. Outputs clean HTML or plain text.
Use it free →Create terms of service documents for your website, app, or SaaS product. Covers liability limitations, acceptable use, intellectual property, and termination clauses. Customizable for your specific business type.
Use it free →Generate creative business name ideas based on your industry, keywords, and style preferences. Checks domain availability for each suggestion. Helps you brainstorm names that are memorable and brandable.
Use it free →Create structured business plans with executive summary, market analysis, revenue model, and financial projections. Guided templates walk you through each section. Export as PDF for investors or personal reference.
Use it free →Find available domain names based on your keywords. Suggests variations, checks TLD availability, and provides registrar links. Covers .com, .io, .co, .dev, and dozens of other extensions.
Use it free →Generate conversion-focused landing page copy including headlines, subheadlines, feature descriptions, and CTAs. Input your product details and target audience, get copy structured for high-converting layouts.
Use it free →Server configuration and DevOps tasks often require looking up syntax you use once every few months. These tools generate correct configurations without memorizing obscure directives.
Build cron job schedules visually. Select minute, hour, day, month, and weekday with a graphical interface. Shows a human-readable description of the schedule and the next 5 execution times. Supports standard and extended cron syntax.
Use it free →Generate Apache .htaccess rules for redirects, rewrites, caching, GZIP compression, security headers, and access control. Select the rules you need and get a ready-to-deploy .htaccess file.
Use it free →Convert between numeric (755) and symbolic (rwxr-xr-x) file permission formats. Visualize permission settings for owner, group, and others. Essential for Linux server administration and deployment scripts.
Use it free →A comprehensive reference for Git commands organized by workflow. Covers branching, merging, rebasing, stashing, cherry-picking, and recovery commands. Searchable, with examples for every command.
Use it free →Small utilities that save minutes per day add up to hours per week. These tools handle the micro-tasks that interrupt your flow: generating passwords, checking screen sizes, testing keyboards, picking emoji.
Generate cryptographically secure passwords with customizable length (up to 128 characters), character sets, and exclusion rules. Uses the Web Crypto API for true randomness. No data is stored or transmitted. Runs 100% client-side.
Use it free →A focused work timer using the Pomodoro Technique: 25 minutes of work, 5 minutes of break, with a longer break every 4 cycles. Tracks completed sessions. Runs in the browser tab with audio notifications.
Use it free →Search and browse the complete Unicode emoji set. Click to copy any emoji to your clipboard. Organized by category with search. Includes skin tone variants, flags, and recently added emoji from Unicode 15.1.
Use it free →Displays your current viewport dimensions and device pixel ratio. Test how your responsive designs look at common breakpoints (mobile, tablet, desktop). Includes a resizable preview frame.
Use it free →Test every key on your keyboard with visual feedback. Detects key codes, key names, and modifier states. Useful for debugging keyboard shortcuts, testing new keyboards, and verifying key mapping configurations.
Use it free →Content creation requires tools that stay out of your way. Markdown editors, README generators, and email templates help you produce professional content without switching between multiple applications.
Write in Markdown with a live split-screen preview. Supports GitHub Flavored Markdown including tables, task lists, syntax highlighting, and footnotes. Export as HTML, PDF, or raw Markdown.
Use it free →Generate professional README.md files for GitHub repositories. Guided sections for project description, installation, usage, API reference, contributing guidelines, and license. Outputs clean Markdown ready to commit.
Use it free →Create professional email templates for outreach, onboarding, follow-ups, and announcements. Customizable fields, responsive HTML output, and plain-text fallbacks. Ready to paste into any email platform.
Use it free →Create embeddable countdown timers for product launches, events, deadlines, and sales. Customize colors, fonts, and formats. Outputs a responsive HTML/CSS/JS snippet you can embed anywhere.
Use it free →Get technology stack recommendations based on your project requirements. Input your use case, team size, budget, and scaling needs. Get specific framework, hosting, database, and tooling suggestions.
Use it free →Business and financial calculators help you make data-driven decisions about pricing, revenue, startup costs, and personal finance. These are especially useful for freelancers and founders planning their next move.
Calculate optimal pricing for your products and services based on costs, margin targets, and competitor benchmarks. Supports hourly rates, project-based pricing, and subscription models.
Use it free →Project monthly and annual revenue based on traffic, conversion rates, and average order value. Model different scenarios to understand how each variable impacts your bottom line.
Use it free →Estimate the total cost to launch your business. Covers incorporation, hosting, tools, marketing, legal, and operational expenses. Includes presets for common business types (SaaS, e-commerce, freelance, agency).
Use it free →Calculate statistical significance for your A/B tests. Input control and variant conversion rates and sample sizes. Shows confidence intervals, p-values, and minimum sample size needed for reliable results.
Use it free →Structure and document your competitive analysis. Compare features, pricing, positioning, and market share across competitors. Export as a formatted report for stakeholders and investors.
Use it free →Track income and expenses with a clean interface. Data persists in your browser's local storage -- nothing is sent to any server. Categorize transactions, view monthly summaries, and export to CSV.
Use it free →Calculate monthly mortgage payments, total interest, and amortization schedules. Input loan amount, interest rate, term, and down payment. Compare different scenarios side by side.
Use it free →The SaaS industry trained us to accept that every tool requires an email address. Create an account to format JSON. Sign up to generate a QR code. Subscribe to compress an image. That model persists because it feeds email lists, not because it serves users.
The counter-movement is real and growing. Tools that run entirely client-side -- no server, no database, no user accounts -- are faster, more private, and more reliable than their SaaS equivalents. Here is why:
This is the model SpunkArt is built on. Every tool works instantly, requires no account, and processes everything in your browser. We monetize by selling the source code to developers who want to deploy these tools on their own domains -- not by harvesting your data.
"The best developer tool is the one you can use in 3 seconds without creating an account. Everything else is friction that costs you more than it costs them."
Get the complete source code for all 75+ tools. Deploy to Cloudflare Workers, Vercel, Netlify, or any static host. One-time payment, no subscriptions, no recurring fees. Yours forever.
$9.99 -- Complete Source Bundle Reseller License -- Sell Under Your BrandContinue your research with these guides: How to Start a SaaS Business in 2026, 50 Essential Tools Every Freelancer Needs, The Ultimate Web Development Checklist, 50 Vibe Coding Tips, and Best Free SEO Tools.
Bookmark spunk.codes and follow @SpunkArt13 for new free tools and developer guides every week.
Tool roundups, tutorials, and new tool launches. No spam, unsubscribe anytime.