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Format, validate, and beautify JSON data online instantly. 100% client-side privacy.

Encode to Base64 or Decode from Base64 instantly. No data sent to servers.

Convert images to Base64 strings and preview Base64 image data directly in your browser.

Encode or Decode URL strings safely. Special characters are correctly converted.

Decode JSON Web Tokens instantly to see the header and payload claims. 100% private.

Generate JSON Web Tokens with custom payload and secret for testing.

Calculate investment growth with deposits, monthly contributions, interest rates, and a visual year-by-year chart.

Calculate percent of a value, percentage ratio, and percent change instantly.

Calculate percent increase or decrease between two values instantly.

Calculate discount amount, sale price, tax, and final price.

Calculate true per-order profit after product cost, shipping, packaging, ads, fees, and expected returns.

Estimate seller fees, payment fees, listing costs, shipping impact, and net payout for marketplace orders.

Find billable shipping weight from package dimensions, actual weight, and carrier divisor.

Find the ROAS, ACOS, and maximum ad spend that keeps an ecommerce order profitable.

Preview how a page title, URL, and meta description may appear in Google-style search results.

Check meta title and description length with practical SEO snippet guidance.

Preview Open Graph metadata and generate copy-ready OG tags for social sharing.

Preview Twitter/X card metadata and generate copy-ready card tags.

Visually generate CSS box shadows and copy the code instantly.

Create polished linear, radial, and conic CSS gradients with copy-ready output.

Convert colors between HEX, RGB, HSL, and CMYK instantly.

Generate harmonious color palettes from a base color for UI, branding, and creative work.

Calculate body mass index from metric height and weight.

Calculate age in years, months, and days from dates.

Calculate the duration between two calendar dates.

Calculate GPA from grade points and course credits.