Guides
Background and worked examples for the problems these tools solve — written to be useful even if you never open the tool.
How to Compress a PDF Without Uploading It
Why your PDF is large, which compression strategy to pick, and how to keep a sensitive document off someone else's server.
Read the guide →Subnet Masks and CIDR, Explained
What a mask actually does, how to read CIDR notation, and how to work out a subnet by hand.
Read the guide →CMYK vs RGB: Why Print Looks Different
Why the screen and the press disagree, how rendering intents change the result, and a pre-export checklist.
Read the guide →Choosing an Image Format: JPEG, PNG, WebP or AVIF
The old JPEG-versus-PNG rule is out of date. What to reach for now, and one thing never to do.
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