Pro Calculators and Guides
How to Repair a Damaged PDF That Will Not Open
Try to fix a PDF that shows an error or opens blank by rebuilding its structure. What works, what does not, and what to do next.
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Pro Calculators and Guides
Specialist calculators are only useful when you understand the rules behind the numbers. These guides explain what each professional calculator does, which inputs matter, how to read the result and where the official rules come from, covering payroll and tax, immigration and visas, housing, business compliance, engineering and science. Every guide links to a free tool that runs in your browser and keeps your figures private.
318 guides
Pro Calculators and Guides
How to Repeat a Word, Sentence or Emoji Many Times (For Testing and Patterns)
Type a word, a phrase or an emoji, choose how many times and the separator, and copy the result in one click.
Pro Calculators and Guides
How to Resize and Crop a Photo for Printing: 4×6, 5×7, 8×10, A4 and Passport
Prepare a photo at the exact print size and correct DPI so the shop or home printer does not crop or stretch it unexpectedly.
Pro Calculators and Guides
How to Reverse Letters, Words or Lines of Text (Without Breaking Bangla)
Reverse text character by character, reverse the word order in each line, or put the last line first. Combined characters such as Bangla vowel signs stay together.
Pro Calculators and Guides
How to Reverse the Page Order of a PDF (Fix Backwards Scans)
Put the pages of a PDF in the opposite order, useful when a scan came out backwards or when you want to print in reverse.
Pro Calculators and Guides
How to Rotate an Image by Any Angle or Straighten a Crooked Photo
Rotate a picture in half-degree steps, expand the canvas so nothing is cut off, and fill corners with transparency or a colour.
Pro Calculators and Guides
How to Round the Corners of a Picture or Make It a Circle (With Transparency)
Set how round the corners are with a slider, from slightly soft to a full circle, and download a PNG with transparent corners.
Pro Calculators and Guides
How to Save PowerPoint Slides as JPG or PNG Images
Turn every slide of a PPT or PPTX into a picture to post on social media or paste into documents, choosing the format and quality.
Pro Calculators and Guides
How to Scan Documents With Your Phone and Save Them as One PDF
Photograph pages with your phone, fix the order and download a single PDF. Tips for lighting, flatness and file size.