How to Format and Validate JSON (and Fix Common Errors)
Make unreadable JSON easy to read, find the exact line of a syntax error, and fix the mistakes that break JSON most often: trailing commas, quotes and comments.
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Short, practical guides to image formats, compression, PDFs and favicons.
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Celsius to Fahrenheit Formula (and Back) With Easy Examples
Convert °C to °F and °F to °C with the exact formula and a quick mental trick, plus a table of common temperatures for weather, fever and cooking.
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How to Make a QR Code for a Link, Wi-Fi or WhatsApp (Free)
Create a QR code for a website, Wi-Fi password, email or phone number, choose colours and error correction, and download a PNG or SVG that prints sharply.
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How Many Pages Is 1000 Words? (Plus Reading and Speaking Time)
Page counts for 250 to 5000 words, single and double spaced, and how long they take to read or present. Useful for essays, assignments and speeches.
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How to Convert PDF to JPG or PNG (Every Page or Just One)
Turn PDF pages into images for WhatsApp, slides or a portal that only accepts JPG. Choose the format, the resolution and which pages to convert.
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How to Merge PDF Files Into One (Free, No Upload)
Combine certificates, scanned pages and assignments into a single PDF in the right order, then shrink it for email or an upload portal.
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How to Resize a Photo for Online Forms (Pixels and KB Limits)
Job and admission portals often ask for a photo of exact pixels and a maximum size in KB. Here is how to resize, crop and compress a photo so the form accepts it.
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The 75% Attendance Rule: How Many Classes Can You Miss?
Work out your attendance percentage, how many classes you can still miss, and how many you must attend in a row to get back above 75% or 80%.
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How to Calculate Percentage of Marks (Matric, Inter and University)
The simple formula for marks percentage, with examples for Matric, FSc and university results, plus how to work out percentage increase and a percentage of any number.