Free Online Tools for
Developers, Marketers & Writers
31 professional-grade tools that run entirely in your browser. No signup, no data collection, no limits. 100% free, forever.
Headline Analyzer
Score headlines with word balance analysis, readability grades, sentiment detection, and A/B comparison. Unlimited, no signup.
WCAG Contrast Checker
Check AA/AAA compliance with auto-fix suggestions. Palette matrix mode for testing multiple color combinations.
Cron Expression Generator
Build cron expressions for Unix, Quartz, GitHub Actions, AWS EventBridge, and Kubernetes with visual builder.
Resume Skills Radar Chart
Create visual skill charts for LinkedIn and resumes. Compare against job descriptions, export as PNG/SVG.
Readability Analyzer
7 scientific formulas (Flesch-Kincaid, Gunning Fog, SMOG, and more) with color-coded sentence heatmap.
UTM Campaign Builder
Smart naming conventions, saved templates, bulk mode, and searchable campaign history. Better than Google’s builder.
YAML Validator & Converter
Validate YAML with detailed error explanations. Convert between YAML and JSON. Tree view and syntax highlighting.
Markdown to HTML Converter
Three-panel live editor: Markdown source, rendered preview, and HTML output side by side. CommonMark + GFM.
Image to Base64 Converter
Convert images to Base64 in your browser. Privacy-first — your images never leave your device. Multiple output formats.
Debt Payoff Calculator
Compare snowball vs avalanche debt payoff strategies. See total interest saved, payoff timeline, and monthly payment schedules.
ATS Resume Keyword Analyzer
Check your resume against job descriptions for keyword matches. Get ATS compatibility scores and optimization tips.
Cash Flow Forecast
Visualize your financial future with interactive cash flow projections. Track income, expenses, and savings over time.
Freelancer Profit Calculator
Calculate your true project profitability after taxes, expenses, and time investment. Know your real hourly rate.
Habit Streak Tracker
Build better daily habits with visual streak tracking. Track multiple habits, maintain streaks, and see your consistency.
Savings Goal Tracker
Set savings goals, track progress with visual charts, and calculate how long until you reach your targets.
Wedding Budget Planner
Track every dollar of your dream wedding. Categorized budgets, vendor tracking, and spending breakdowns.
JWT Decoder
Decode and inspect JSON Web Tokens client-side. View header, payload, claims, and expiry. No data leaves your browser.
Schema Markup Generator
Build valid JSON-LD structured data for Google rich results. Visual builder for Article, FAQ, Product, and more.
Chmod Calculator
Visual Unix file permission calculator. Toggle read, write, execute flags and get octal, symbolic, and chmod commands.
Character Counter
Count characters for Twitter, Google Ads, LinkedIn, YouTube, Instagram, and more with real-time platform limits.
LLM Token Counter
Count tokens and estimate API costs for GPT-4o, Claude, Gemini, Llama and more. Optimize prompts and manage costs.
SERP Preview Tool
Preview how your page appears in Google search. Desktop and mobile views with title truncation and description display.
TDEE & Macro Calculator
Calculate your Total Daily Energy Expenditure with personalized macro breakdowns, diet presets, and meal targets.
QR Code Generator
Create styled QR codes with custom colors, gradients, dot patterns, and logos. Free PNG and SVG download.
Due Date Calculator
Calculate your pregnancy due date with week-by-week development tracking, milestone calendar, and visual timeline.
Ovulation Calculator
Track ovulation and fertile window with a visual color-coded multi-month calendar and luteal phase tracking.
Color Palette Generator
Generate accessible color palettes with WCAG contrast scoring, colorblind simulation, and export to CSS, Tailwind, and JSON.
Compound Interest Calculator
Compare up to 3 investment scenarios side by side with visual charts, inflation adjustment, and yearly breakdowns.
Image Compressor
Compress JPEG, PNG, and WebP images in your browser with batch upload, quality slider, and before/after preview. 100% private.
Tip Calculator
Calculate tips with US state tax lookup, visual tip comparison chart, and itemized bill splitting for groups with shared dishes.