UUtilityApp

About UtilityApp

UtilityApp is a library of 300+ free online utilities — calculators, converters, generators, formatters and validators — built around one idea: the boring tools you need every day should be fast, free and private.

How the tools work

Every tool on this site runs entirely in your browser using JavaScript. When you paste text into a formatter, type numbers into a calculator, or generate a document, that data is processed on your device and never uploaded to our servers. There are no accounts, no sign-ups, no upload queues and no watermarks.

What you'll find here

  • File & Data Converters — JSON ⇄ CSV, XML, YAML, Base64, color & number-base converters that run in your browser.
  • PDF Tools — Merge, split, compress, convert and edit PDF files for free.
  • Text Tools — Clean, count, transform and reformat any text in one click.
  • Developer Tools — Formatters, validators, encoders, hashers and generators for developers.
  • SEO Tools — Meta tags, schema markup, robots.txt, UTM and slug generators.
  • Finance Calculators — EMI, SIP, GST, tax, mortgage and investment calculators.
  • Business & Ecommerce — Margin, pricing, breakeven, SaaS metrics and marketplace-fee calculators.
  • HR & Office — Salary, overtime, timesheet calculators and workplace letter generators.
  • Documents & Legal — Invoices, quotations, NDAs, contracts and policy generators.
  • Image Tools — Convert PNG/JPG/WebP, resize, compress and make favicons — privately.
  • Unit Converters — Length, weight, temperature, volume, speed, data and cooking converters.
  • Health & Fitness — BMI, calorie, body-fat, macro, pace and pregnancy calculators.
  • Date & Time — Age, date difference, countdown, business-day and timestamp tools.
  • Math & Everyday — Percentage, fraction, ratio, GPA, tip and random generators.

Accuracy

Calculators use standard published formulas (which we show on each page), and converters use exact SI/standard conversion factors. Results are provided for general information — for financial, legal, medical or other consequential decisions, always verify with a qualified professional.

How the site is funded

UtilityApp is free to use and supported by advertising. See our privacy policy for details on how ads work on this site.

Get in touch

Found a bug, want a new tool, or have feedback? Visit the contact page — we read everything.