ResizeImg field guides
Practical image guides based on how the tools work
Clear explanations of dimensions, formats, compression trade-offs and browser processing—written to help you make a better output, not to fill a page.
Written and reviewed by ResizeImg · Updated 11 August 2026Complete overview
How to reduce image size without ruining quality
Understand dimensions, encoding, format choice and a repeatable five-step image optimization workflow.
10 minute readFocused answers
Choose the problem you need to solve
Each guide explains the decision, the trade-offs and how ResizeImg handles the file.
File-size field guide
How to compress an image to a target size in KB or MB
Learn how target-size image compression works, why exact file sizes vary, and how to reach an upload limit without unnecessary quality loss.
8 minute readResizing field guide
How to resize an image without stretching it
Understand aspect ratio, downscaling, enlargement and practical quality checks before changing image dimensions.
8 minute readFormat field guide
JPG vs PNG vs WebP: which format should you use?
Compare JPG, PNG and WebP for photographs, transparency, graphics, compatibility and file size.
9 minute readCropping field guide
How to crop an image to a new shape without stretching it
Learn how crop position, aspect ratio and final dimensions work together when preparing square, portrait or landscape images.
8 minute readTransparency field guide
How to make a transparent PNG from a plain background
Understand color-based background removal, tolerance, edge checks and when a complex image needs a different workflow.
9 minute readWatermark field guide
How to add a readable watermark without hiding the image
Choose watermark text, size, opacity and placement that remain readable without pretending a visible mark is permanent protection.
8 minute readWeb image field guide
How to choose image dimensions for a faster website
Size website images for their real layout, preserve aspect ratio and avoid sending camera-sized files to small page components.
9 minute read