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Percentages, rule of three, units, PDFs and text from photos for homework and exams, with free video courses and education news.

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Your tools

Percentage Calculator

Percent of a number, percent change, discount price, and tip splitting - five common questions in one tool.

Rule of Three Calculator

Solve any rule of three - direct or inverse - and see the calculation step by step, with ready-made examples.

Unit Converter

Convert length, weight, temperature, area, volume, speed, time, pressure, energy and data - instantly, in your browser.

Image to Text (OCR)

Copy the text of a photo, scanned document or screenshot in English, Portuguese or Spanish - free, and the image never leaves your device.

Merge PDF

Join several PDFs into one in the order you choose - free, no sign-up and without uploading your files.

Split PDF

Take only the pages you need from a PDF, or split it into one PDF per page - free, private and in your browser.

Images to PDF

Turn photos, scans and screenshots into a single PDF - one page per image, A4, Letter or original size - without uploading anything.

PDF to Image (JPG/PNG)

Turn every page of a PDF into a JPG or PNG image, up to 300 dpi - free, without sign-up and without uploading the file.

Word & Character Counter

Live word, character, sentence and reading-time counts as you type.

Text Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.

Pomodoro TimerNew

A free Pomodoro timer: 25-minute focus blocks, short and long breaks, a soft sound at the end and today’s count of focus blocks. No sign-up.

Countdown Timer

A live countdown in days, hours, minutes and seconds to Christmas, New Year, Carnival or any date - with a link to share.

BMI Calculator

Calculate Body Mass Index from height and weight, with the WHO category and a healthy-weight range.

Browse all 80 free tools

News

Learn with videos

Free courses from YouTube channels, in order. Tick each lesson as you watch it, set a weekly goal and download your certificate at the end.

Matemática básica

by Professor Ferretto · 15 lessons · PT

0 of 15 lessons watched

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Como estudar do jeito certo

by Programação Dinâmica · 15 lessons · PT

0 of 15 lessons watched

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Técnicas de estudio

by educalive · 15 lessons · ES

0 of 15 lessons watched

👥 Study with friends →

Videos are played from YouTube (youtube-nocookie.com) only after you press play; your progress stays in this browser. The courses belong to their channels.