Articles & Guides
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Convert Excel to PDF Online: Choose Sheets, Page Size, and Layout
Convert an Excel workbook to PDF, choose which sheets to include, set page layout options, and check the exported pages before sharing.
Prepare Photos and PDFs for Online Forms: Crop, Resize, Convert
A practical workflow for checking portal requirements, cropping and resizing a photo, and converting images or screenshots to PDF without guessing specifications.
How to Estimate Daily Calorie Needs with BMR and Activity
See how BMR and activity are used to estimate daily calorie needs, what a calorie target means, and why the result is only a starting estimate.
How to Extract Pages from a PDF: Single Pages, Ranges, or a New File
Learn how to extract selected pages from a PDF, use page ranges correctly, and keep the original file unchanged while creating a smaller PDF.
Website Speed Test: How to Read the Results and Find the Bottleneck
Run a website speed test, understand what the results can show, and separate connection, server, and page-weight problems before optimizing.
How to Check Website Page Size: HTML, Images, Scripts & Fonts
Learn what a website page-size estimate includes, how to find heavy images and scripts, and how to verify the full transfer size in browser DevTools.
Days Between Dates: Inclusive vs Exclusive Counting
Count days between dates correctly with examples for elapsed days, inclusive dates and weekdays. Understand endpoint rules and the date calculator limitations.
Percentage Change vs Percentage Points: Worked Examples
Learn the difference between percentage change and percentage points with clear examples, reverse calculations, and guidance for using a percentage calculator.
PNG to JPG: Why Transparency Turns White
Understand why converting PNG to JPG removes transparency. Learn when to keep PNG, how white backgrounds affect logos, and how to check your converted file.