Know your real numbers before the platform takes its cut

Calculate the exact Stripe fee on any transaction — domestic cards, international cards, currency conversion and ACH — plus your monthly totals.

Calculate PayPal seller fees on any transaction — domestic, international and micropayment rates — and see what you actually keep.

Calculate Square processing fees for in-person, online, keyed-in and invoice transactions — see your net per sale and per month.

Calculate what Wise actually charges on your transfer — the fixed fee, the variable percentage, and what arrives on the other side.

Calculate Payoneer's real cost: receiving payments from clients and marketplaces, currency conversion markup, and withdrawing to your bank.

Compare PayPal and Stripe processing costs at your ticket size and volume — see which is cheaper for your business and by how much.

Stripe's fee depends on where your business is registered. Compare domestic rates across the US, UK, EU, Canada, Australia and more.

Compare the real cost of receiving an international payment through PayPal vs Wise — including the currency-conversion markup most people miss.

Calculate your real Etsy profit per order after listing fees, the 6.5% transaction fee, payment processing and optional Offsite Ads.

Calculate eBay final value fees by category, optional Promoted Listings cost, and see your real payout per sale.

Calculate your real monthly Shopify profit after the plan fee, payment processing, apps and cost of goods.

Calculate true dropshipping profit per order after product cost, shipping, payment fees and ad spend — plus your break-even ROAS.

Calculate your real Amazon FBA profit: referral fees by category, fulfillment fees by size tier, and your net margin per unit.

Calculate Poshmark's selling fee — flat $2.95 under $15 or 20% at $15+ — plus your earnings and the effective take rate.

Calculate Depop's 10% selling fee plus payment processing on any sale — see your real payout and effective take rate.

Calculate the sale price after any discount percent — see final price, amount saved, and what stacking a second discount does.

Compare real costs: Etsy's fee stack vs Shopify's plan + processing at your price and volume — see the break-even point.

Estimate YouTube AdSense revenue from monthly views and niche — realistic RPM ranges, monetized-playback share, and yearly projections.

Estimate TikTok Creator Rewards earnings from qualified views — realistic RPM ranges and monthly/yearly projections.

Work backwards from your income goal: taxes, expenses, vacation and non-billable hours to the hourly and day rate you must charge.

Calculate Patreon's cut of your memberships: platform fee by plan plus payment processing — see your real net monthly income.

Estimate Substack net income: paid subscribers × price minus the 10% platform fee and Stripe processing — monthly and yearly.

Estimate monthly Twitch income from subscribers, Bits and ad revenue — realistic splits and what streamers actually keep.

Calculate Gumroad's platform fee plus payment processing on digital product sales — see your net per sale and effective take rate.

Calculate what you keep on Ko-fi: 0% on donations, 5% on memberships and shop sales (0% on Gold) minus PayPal/Stripe processing.

Calculate Upwork's 10% freelancer service fee plus withdrawal costs on any contract — see your real take-home per job.

Calculate Fiverr's 20% seller fee on any gig order — your real earnings per order and what the platform takes per month.

Calculate social media engagement rate from followers and interactions — plus how your number stacks up against benchmarks.

Calculate your break-even point in units and revenue from fixed costs, price and variable cost per unit — plus contribution margin.

Add VAT to a net price or strip VAT out of a gross price — standard rates for the UK, EU and Serbia.

Calculate customer lifetime value, LTV:CAC ratio and CAC payback months from ARPU, margin, churn and acquisition cost.

Calculate the monthly payment on any loan — plus total interest and the real cost of borrowing over the full term.

See how an initial deposit plus monthly contributions grows with compounding — final balance, total contributions and interest earned.

Convert an annual salary into hourly, daily, weekly and monthly rates — adjusted for your actual working hours and vacation.

Calculate US sales tax by state: add tax to a price or strip it out of a total. State base rates for all 45 taxing states plus DC.

Calculate your real monthly mortgage payment: principal & interest plus property tax, insurance and HOA — and the total cost of the loan.

Calculate gross margin and markup from cost and price — or price from cost and target margin. The difference explained with real math.

Calculate ROAS from ad spend and revenue — plus your true break-even ROAS once margin is factored in.

Calculate CPM, CPC and CTR from spend, impressions and clicks — compare ad costs across platforms and campaigns.

Calculate the tip, the total, and what each person pays when splitting the bill — with tip-on-pre-tax done the right way.

Paste a JWT and instantly see its header, claims and expiry — decoded entirely in your browser. No upload, no sign-up, nothing leaves your device.

Paste a Dockerfile and get an instant security review: baked secrets, unpinned base images, root containers, curl-pipe-to-shell and remote ADD — all checked locally.

Paste HTTP response headers and instantly see which security headers are missing — HSTS, CSP, X-Frame-Options, nosniff, Referrer-Policy, Permissions-Policy — plus cookie flag and Server version checks.

Paste your .env and .env.example to instantly find missing keys, empty values and undocumented extras. Values never leave your browser — only key names are compared.

Paste your API's CORS response headers and detect dangerous setups: wildcard origins with credentials, null-origin acceptance, reflected origins and missing Vary: Origin.

Paste code or a git diff and detect leaked credentials — AWS keys, GitHub and Slack tokens, private key blocks, hardcoded API keys and JWTs. Matched values are masked, never displayed.

Paste a GitHub Actions workflow YAML and catch the top-5 CI/CD risks: unpinned actions, script injection, pull_request_target abuse, secrets in run steps and write-all permissions.

Paste your page HTML, robots.txt and llms.txt to see if ChatGPT, Perplexity, Claude and Google AI can actually read, parse and cite your site — 13 checks, all in your browser.

Paste JSON to validate and pretty-print it — with error location (line and column) when it's broken, plus key count, depth and size stats. Runs entirely in your browser.

Paste a 5-field cron expression and get a plain-English schedule plus the next 5 run times — with a warning when the day-of-month/day-of-week OR-rule will surprise you.

Test a regular expression against your text with instant results: all matches, their positions, capture groups and flag support — runs locally, nothing sent anywhere.

Encode text to Base64 or decode it back — proper UTF-8 handling so non-ASCII characters don't corrupt. Runs entirely in your browser.

Percent-encode or decode strings, and break any URL into protocol, host, path, query params and fragment — decoded params listed cleanly.

Generate up to 50 random UUIDs (v4) at once — cryptographically secure, instantly copyable, with uppercase option. No server, no tracking, just crypto.randomUUID().

Convert any color between HEX, RGB and HSL — plus instant WCAG contrast ratios against white and black text so you know it's accessible.

Convert Unix timestamps (seconds or milliseconds) to human dates and back — with relative time, ISO 8601, and your local timezone.

Paste two versions of a text or file and get a line-by-line diff: added, removed and unchanged lines, unified-diff style. Runs locally — paste production configs safely.

Count words, characters, sentences and paragraphs in any text — plus reading time and top-word frequency for SEO content checks.

Convert any text between camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE and Title Case — handles existing camelCase input correctly.

Convert between decimal, hexadecimal, binary and octal instantly — accepts 0x, 0b, 0o prefixes, handles huge numbers exactly (BigInt, no float overflow).

Find a dimension's aspect ratio and scale it proportionally — enter a new width or height and get the matching dimension instantly.

Generate up to 20 paragraphs of lorem ipsum placeholder text instantly — deterministic, copy-ready, for mockups and layout testing.