Resolution and screen size comparisons

Resolution and screen size comparisons is the tool on this page. The control sits above this text. Use it on the display you want to judge, then read what the result can and cannot mean. The target phrase people search is tied to this job, and the explanation below stays with that job instead of repeating a generic review of every display ever made.

A comparison is a pair of counts plus a reason to care. 1280×720 against 1920×1080 is two and a quarter times the pixels, not a vague step up. 2560×1440 against 3840×2160 is the same 2.25 ratio again. 8K against 4K is another doubling of each side. On a chart that looks like a ladder. On a desk it often is not, because your eyes, your scaling, and your graphics card spend the extra pixels or they do not.

Monitor size and television size are both a diagonal, and they are not the same purchase. A 32-inch monitor at arm's length fills more of your vision than a 32-inch television across a room, which almost nobody does. The visualizer draws the rectangles in proportion so a 27 next to a 32 is obvious without a tape measure. Take a tape measure anyway before you buy a desk.

Ultrawide against 16:9 is a shape change, not a sharpness change. A 3440×1440 panel is as tall in pixels as a 1440p widescreen and much wider. Games gain a peripheral view. Video with black bars stays 16:9 in the middle. Spreadsheets gain columns. The page draws both shapes on the same height so you see the extra width instead of a slogan.

What is my screen resolution reads the screen object the browser exposes: the reported width, height, and devicePixelRatio, plus the layout viewport. A scaled desktop can report the panel's pixels while the page layout uses a smaller CSS pixel. Both numbers are useful. Neither is the EDID block. If they disagree with the operating system's control panel, believe the control panel for the mode you set, and believe the browser for the mode the page is actually painting.

Screenz is a set of pictures and arithmetic for the display you already have. The picture is drawn by the browser. The arithmetic is the same formula a spec sheet uses, written out so you can change the inputs. Neither one is a laboratory certificate. A dead pixel you can see is real. A refresh number that does not match the sticker is a clue about the operating system, the cable, the battery mode, or the browser, not an automatic failure of the panel.

Use fullscreen when you are hunting a mark. The address bar, the notch, and the rounded corner all hide the edge, and the edge is where a bad pixel and a fold crease like to sit. On a phone, turn the brightness up and turn off the reading tint. On a monitor, leave the preset you actually use, then repeat the test in the neutral preset if you are judging color. Night shift, f.lux, and vivid modes are fine for the evening and misleading for a test.

Dust sits on the glass and moves when you tilt the panel. A dead subpixel stays dark. A stuck subpixel stays lit, so it shows on black. A crease on a foldable is a hinge in the stack. It is not a dead pixel, and a flat color shows it more honestly than a photograph. Pressure spots and backlight bleed on an LCD change with the angle of your head. OLED black should look off, except at the camera hole and along a fold.

The browser cannot measure nits, cannot read EDID on most pages, and cannot promise that a 10-bit ramp is being sent as 10-bit. If a gradient shows steps, the steps may be the panel, the operating system, or the compositor. If a refresh counter reads 60 on a 144 Hz monitor, check the cable, the power plan, and the display setting before you blame the page. Screenz will say this again because it is the difference between a useful test and a false warranty claim.

Photographing the panel with a second phone adds moiré and makes uniformity look worse than it is. Trust your eye at the distance you actually sit. Move closer only to confirm that a mark is in the pixels rather than on the glass. Then wipe the glass and look again. A foldable should be checked twice, cover display and inner display, because they are different diagonals, different pixel densities, and often different aspect ratios.