UsefulTab
Guides
Short, practical walkthroughs for the tasks people land on UsefulTab to do. Each guide explains the problem in plain terms and points you straight to a free tool that handles it — all running locally in your browser, with nothing uploaded.
Calculate a percentage the easy way
The three percentage questions people actually ask — X% of Y, what percent is X of Y, and percent change — with the simple formula for each.
Merge PDF files into one
Combine several PDFs — and images — into a single file, in order, without uploading anything or hitting a daily limit.
Create a strong, secure password
What actually makes a password hard to crack — length over symbols — and how to generate and check one without it ever leaving your browser.
Convert a Word document to PDF
Turn a .docx into a clean PDF for sharing or printing — why PDF, what carries over, and how to do it without uploading the file.
Compress an image to an exact KB size
Hit a strict upload limit like 20, 50, or 100 KB — what actually controls file size, and how to get there without wrecking the photo.