Scope
Assumptions and limits
Browser encoders, colour profiles and format support vary. HEIC, SVG, animated images, RAW, TIFF and PDF are excluded from P0.
Results use the values you enter and the conventions described in the methodology below.
Explore everyday utility tools for related tasks in this collection.
01
How aspect ratio works
When width changes, proportional height equals original height × new width ÷ original width.
02
Fit versus fill and crop
Fit uses the smaller scale so everything remains visible. Fill uses the larger scale and crops the excess from the centre.
03
Compression and formats
JPEG and WebP quality are lossy controls. PNG preserves transparency and does not use the same quality model.
04
Privacy and metadata
Images are processed locally. Re-encoding normally removes embedded camera and location metadata, but outputs should still be checked before sharing.
FAQ
Frequently asked questions
Are images uploaded?
Which formats are supported?
How do I avoid stretching?
Can I process multiple images?
Does compression reduce quality?
Why can output be larger?
Sources
Method references and scope
Method: results come from tested code using the documented method and assumptions shown on this page.
Review owner: Great Future Product Engineering.
Method and content last reviewed: . Next review due: .