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Free online calculators and unit converters for finance, health, math, science, home improvement and…
Fast, private developer utilities — JSON, encoding, hashing, color, CSS, generators, formatters and …
Text tools for writers, students and social media — case converters, font and Unicode generators, co…
Edit, convert and generate images and PDFs right in your browser. Resize, compress, convert formats,…
Handy little browser apps — generators, trackers, planners, timers and references that solve an ever…
Free, private AI utilities — prompt builders and testers, token & cost calculators, model comparison…
Learn AI from zero — clear explainers, a full glossary, step-by-step tutorials, roadmaps, model comp…
Free, private validators and format checkers — VAT and tax IDs, IBAN and bank codes, national identi…
Free tax, payroll and take-home calculators by country and region — income tax, VAT/GST, payroll and…
Popular tools
HEIC to JPG / PNG / WebP Converter
Convert iPhone HEIC photos to JPG, PNG or WebP — right in your browser.
Online Timer, Stopwatch & Pomodoro
A countdown timer, stopwatch and Pomodoro focus timer in one tab.
QR Code Generator
Create custom QR codes for URLs, text and more — download as PNG or SVG.
Image Compressor
Shrink JPG, PNG and WebP images without uploading them.
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
Regex Tester with Plain-English Explainer
Test regular expressions live and see them explained in plain English.
LLM API Cost Calculator
Estimate the cost of any GPT, Claude or Gemini API call — per request and per month.
UK Mortgage Calculator
Work out monthly repayments, total interest and overpayment savings.
What Is a Token in AI? Tokens Explained
What tokens are, why AI models use them, and how to count them.
VAT & Sales Tax Calculator
Add or remove VAT, GST or sales tax for any country.
Compound Interest & Savings Calculator
Project savings growth with regular deposits and compound interest.
Free Invoice Generator
Build a branded invoice with line items, tax and totals, then export a clean PDF.
Loan & Personal Credit Calculator
Monthly payment, total cost of credit and representative APR.
Loan Comparison Tool
Compare up to 3 loans side by side — payment, total interest and a balance chart.
Merge PDF
Combine multiple PDFs into one, drag to reorder, download — nothing uploaded.
Tip Calculator & Bill Splitter
Split the bill, add a tip, round up and share the result.