Lock the aspect ratio, resize to any target box, and convert px, cm, mm, in and pt with DPI — instantly, right in your browser.
Try it Free →Type a new width and the height follows the original aspect ratio automatically — or unlock for free editing.
Fit width, fit height, or go free-form with a live distortion warning showing exactly how much the image stretches.
Give a container size and see all three fit results at once, with scale factor plus letterbox or crop pixels.
Convert between px, cm, mm, inch and pt at 72, 96, 150, 300, 350 DPI or any custom value.
Paste a list like 1920x1080 line by line and convert every size with the same rule, then copy them all.
All math runs in your browser with no upload and no account, and your last settings are remembered locally.
Type the source width and height, or pick a preset such as 1920×1080, Instagram Story or A4 at 300 DPI.
Keep the lock on for proportional results, then set a target width, target height, or a scale percentage.
The result card shows the final width × height, total megapixels and scale factor. Copy the whole size or just one side.
Open the fit panel for contain/cover math, or the batch panel to convert a whole list of sizes at once.