Guides
Straight explanations of how file formats actually work, so you can make a decision rather than guess at a setting.
How to compress a PDF without losing quality
Most oversized PDFs are large for one specific reason. Find it first and you can often shrink the file with no visible loss at all.
5 min read
JPG vs PNG vs WebP: which format to use and when
Three formats, three different compromises. Which one is right depends less on quality than on what the image contains.
5 min read
Are online PDF and image tools safe? How to check
You can settle the question yourself in about thirty seconds, without taking anyone's word for it. Here is the test.
5 min read
How to reduce image size for email attachments
Attachment limits are smaller than they look, and the fix is usually resizing rather than compressing. The difference matters.
4 min read
How to merge, split and reorder PDF files
Combining and rearranging PDFs is lossless if the tool does it properly. Here is what "properly" means, and how to tell.
5 min read
Image resolution and DPI, explained properly
DPI is one of the most misunderstood numbers in imaging. For screen work it means nothing at all — and knowing why makes sizing decisions obvious.
5 min read