Free online tools that
just work.

Format, validate, and minify JSON — with syntax error pinpointing.

Encode or decode Base64 strings — works for text and files.

Percent-encode or decode URLs and query parameters — full and component modes.

Turn any text or URL into a QR code as you type, pick colors, size and error correction, and download it as a PNG — free, no signup.

Create strong, random passwords with customizable length and character sets — runs offline.

Convert colors between HEX, RGB, HSL, HSV, and CMYK — with live preview.

Convert between metric and imperial units — length, weight, temperature, area, volume.

Compute percentages, increases, decreases, tips, and percentage-of-total — six modes.

Calculate the monthly payment, total interest, and total paid on a loan, with a month-by-month amortization schedule.

Calculate your exact age in years, months, days, hours, and minutes.

Calculate your Body Mass Index in metric or imperial units — instant result, no signup.

Count words, characters, sentences, paragraphs, and estimated reading time.

Convert Markdown to clean HTML — with live side-by-side preview.

Convert times across cities — schedule meetings across timezones effortlessly.

Compress JPG, PNG, and WebP images in your browser — no upload needed.