Free Online Tools — Private by Design
No Signup, Inputs Stay Local
We built 100+ free browser-based tools — calculators for finance, trading, and real estate, utilities for developers and freelancers, tools for e-commerce, health, SEO, and more — and every single one runs client-side in your browser.
No accounts · No uploads · Inputs stay in your browser · No mandatory downloads
Our Most Popular Tools
Hand-picked tools loved by thousands of professionals worldwide.
Budget Planner
Plan your monthly budget and track expenses.
ADP Paycheck Calculator
Estimate net take-home pay from hourly or salary wages.
Prop Firm Breakeven
Calculate exactly what you need to pass your evaluation.
Dropshipping Margin
Calculate true profit margins including ad spend and fees.
Sponsorship Calc
Calculate fair brand deal rates for YouTube integrations.
UTM Builder
Generate campaign tracking URLs with proper parameters.
Keyword ROI
Calculate the actual monetary value of a ranking keyword.
Bcrypt Hash Gen
Generate and verify strong bcrypt password hashes securely in your browser.
JSON Formatter
Validate and beautify JSON payloads.
Markdown to HTML
Convert Markdown to clean HTML with live preview and XSS protection.
SQL Formatter
Instantly beautify messy SQL queries with perfect indentation.
PDF Merger
Merge multiple PDFs locally without uploading.
Freelance Tools
Earn smarterPersonal Finance
Manage your moneyReal Estate
Build your portfolioTrading Tools
Manage your riskE-commerce Tools
Grow your storeSocial Tools
Boost your reachSEO Tools
Rank higherHealth & Fitness
Stay healthyTravel Tools
Plan your tripEveryday Math
Calculate instantlyMath & Education
Solve it fastPrivacy Tools
Stay secureDeveloper Tools
Code fasterMedia Tools
Create & convertBuilt on three principles.
Every tool on this site follows the same rules — no exceptions, no premium tiers, no upgrades.
Client-side only
Every calculation runs in your browser. No data ever leaves your device — not to our servers, not to third parties, not anywhere. You can verify this by opening DevTools and watching the network tab while you use any tool.
Free, always
No subscriptions, no paid tiers, no feature paywalls, no usage limits. The site is funded by display ads that run alongside the tools — never inside them, never interrupting your calculation, never gating results.
Accounts needed
No email address, no password, no OAuth, no "just sign up to save your results." Open the page, use the tool, close the tab. That is the full lifecycle — nothing persists unless you explicitly copy or download it yourself.
Frequently Asked Questions
Everything you need to know about the platform and how we manage your data.