Image formats
JPG vs PNG for Websites: Which Image Format Should You Use?
Compare JPG and PNG for website photos, logos, screenshots, transparency, image quality and page speed, with practical conversion options.
7 min read
Plain Tools journal
Useful guides for everyday digital jobs
Straight answers, worked examples and practical tools for image files, calculations and online tasks.
Original guides
Latest articles
Image conversion
How to Convert PNG to JPG Without a Black Background
Learn why transparent PNG files can turn black when converted to JPG and how to replace transparency with a clean white background.
6 min read
Private image tools
How to Reduce Image File Size Without Uploading It
Compress and resize an image privately in your browser without sending the file to a remote server, then compare quality and download size.
7 min read
Photo printing
4×6 Photo Size in Pixels at 300 DPI (and Other Resolutions)
A 4×6 inch photo at 300 DPI is 1200×1800 pixels. See dimensions for other print resolutions and learn how cropping affects the result.
6 min read
World time
Why the Time Difference Between Two Cities Can Change
Understand why city time differences shift during daylight saving changes and calculate the correct current offset for calls and travel.
7 min read
Email images
How to Resize a Photo for Email Without Ruining the Quality
Resize a photo for email by choosing sensible pixel dimensions, preserving aspect ratio and comparing compression before attaching it.
6 min read