Get any image or screen's aspect ratio in reduced form with common-ratio matching — 16:9, 4:3, 1:1 and custom. Check a 1920×1080 screen reads 16:9 — free, runs locally.
Content reviewed October 2026 · About Toolzum
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
Simplify any two-number ratio to lowest terms via GCD — paint mixes, screen sizes, shares. Reduce 150:225 to 2:3 in one pass — free, runs locally.
The Pythagorean theorem solves c = √(a²+b²) for the hypotenuse from two legs — ladders, ramps, screen diagonals. A 3-4-5 triangle reads c = 5.00 on site — free, runs locally.
Add one custom text caption onto a photo with color, size (10–300px slider), and X/Y position controls, composed on fixed social-size canvases — Instagram Post 1080×1080, Reel 1080×1920, YouTube Banner 2560×1440, Twitter Header 1500×500, or Custom. Exports PNG locally in your browser on Canvas; 3 free downloads a day.
Scale one image to exact pixel dimensions — width/height fields prefill from the source — with optional aspect-ratio lock, PNG/JPEG/WebP output picker, and quality control for JPEG/WebP. Files over 50MB are rejected; resizing runs on plain canvas drawImage locally.
16:9 — divide both by their GCD (120). The tool reduces any dimension pair; 1080×1080 gives 1:1, 1200×800 gives 3:2.
Lock the ratio by hand: a 4000×3000 photo (4:3) at 1920 wide must be 1440 tall (1920 × 3 ÷ 4). This tool reduces ratios — it has no target-size solver, so compute the matching side yourself.
16:9 landscape for YouTube, 9:16 vertical for Reels and Shorts, 1:1 for feed posts. Reduce the dimension pair here to confirm the ratio before opening the editor.
No — math runs locally in your browser. Dimensions never leave your device.
Screen Size Calculator
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
DPI Calculator
Compute display DPI from pixel width, pixel height, and diagonal inches — diagonal pixels over diagonal size. Compare phone and laptop sharpness honestly — free, runs locally.
PPI Calculator
Compute screen pixel density from resolution and diagonal size — compare phone sharpness honestly. A 1080p 6-inch display gives ~367 PPI — free, runs locally.