Guide sitemap
Privacy & safety
Public temporary phone numbers: privacy risks and safer uses
How to test an SMS verification flow safely
PDF guides
How to merge PDF files in the right order
How to reduce PDF size before uploading
How to extract pages from a PDF safely
Turn document photos into a clean PDF
A simple way to organize PDF pages
Fix sideways PDF pages for reading and printing
Privacy & security
When and how to password-protect a PDF
How temporary email works and when to use it
Work & productivity
What PDF metadata reveals before you share a file
Everyday tools
How to convert units and check date calculations
AI tools
How to choose an AI tool for research, writing, or coding
A practical framework for writing clearer AI prompts
Developer guides
How to format and validate JSON before an API request
Freelancer guides
How to prepare a clear freelance quote for a client
Career guides
How to structure a resume that is easy to scan
Study guides
Plan a focused study session you can repeat
Image guides
How to prepare images for websites and sharing
Video guides
How to reframe a video for different platforms
Business guides
How to estimate a practical inventory reorder point
Writing guides
Clean and count text before publishing or submitting
Calculators
How to use online calculators for better everyday estimates
Research guides
A careful workflow for finding datasets and scholarly sources
Accounts & privacy
What a browser-only profile saves in Tool Fly