Flag Analyzer
Drop in any flag image and see what it's made of — its dominant colors and how much of the flag each one covers, its aspect ratio, whether it's mirror- or rotation-symmetric, and how it scores against NAVA's "Good Flag, Bad Flag" principles. Everything runs in your browser.
Drag & drop a flag image here, or
Flag
Proportions width : height
Symmetry how the flag reads when flipped
Higher = the flag looks the same after that flip. High left–right symmetry means the flag reads the same from either side (front and back look alike).
Dominant colors
NAVA critique Good Flag, Bad Flag
Principles from the North American Vexillological Association. Color count and simplicity are measured from the image; symbolism, lettering and distinctiveness are reminders — a picture can't fully judge those.
Make your own
Like what you see, or want to fix a warning? Rebuild it from scratch in the companion tool.
🛠 Open Flag Designer