CompressResize Guides
Make better image decisions
Clear explanations, practical decision tables and tools you can use immediately. No recycled lists of settings and no promise that one format wins every time.
How many pixels is 100 KB?
Use your actual image to calculate dimensions and create a verified file below 100 KB.
6 min readRead the guide →02Pixels and KBCan you convert pixels to KB? Image size explained
Learn why dimensions do not determine file size and how to reach a KB limit without guessing.
7 min readRead the guide →03FormatsJPG vs PNG vs WebP: which format should you choose?
A decision framework for photos, transparency, websites, email and strict upload limits.
9 min readRead the guide →04QualityHow to reduce image size without ruining quality
Understand pixels, encoding quality and format changes before making a file smaller.
8 min readRead the guide →05WorkflowsPrepare images for forms, email and websites
Three practical workflows with different priorities, checks and recommended outputs.
10 min readRead the guide →Our method
Advice that matches what browsers actually do
These guides distinguish between dimensions, file size, format and encoder quality. When a choice depends on the image itself, the guide says so and links to a local comparison instead of inventing a universal answer.
Compare your imageStart with the constraint
Choose a workflow by what must remain true
A file can fail because its dimensions are wrong, its byte size exceeds a limit, its format is rejected or its transparency disappears. Those are different problems. Before changing an image, identify the exact requirement and preserve what matters: readable text in a screenshot, natural detail in a photograph, a transparent logo or a strict upload limit.
For forms
Check format, maximum bytes and exact dimensions before compressing. A smaller file can still be invalid.
For websites
Match displayed dimensions, compare modern formats and avoid shipping pixels that the layout never shows.
For email
Prioritize compatibility and a practical attachment size while keeping the subject legible at normal zoom.
How these guides are maintained
Advice is checked against the browser workflows offered on this site using photographs, screenshots, graphics and transparent samples. Because encoders and source images differ, we publish decision rules and limitations rather than claiming one quality percentage works for every file. Read the editorial and testing policy for our review, privacy and correction process.