Aspect Ratio Lock - Lock the Aspect Ratio

Calculate dimensions with fixed aspect ratio

Size

Current Rate

16:9

({ratio.toFixed(4)})

Preview & Export

1920×1080
Dimensions: 1920x1080
Ratio: 16:9
CSS aspect-ratio: aspect-ratio: 16/9;
Decimal: 1.777778

Aspect Ratio Lock Online - Free aspect ratio lock and size calculator

Tan Phat Digital's Aspect Ratio Lock tool helps you calculate dimensions with a fixed aspect ratio. Lock proportions when resizing - changing width automatically calculates height and vice versa. 8 popular ratio presets: 1:1 (Square), 4:3 (Standard), 16:9 (Widescreen), 21:9 (Ultrawide), 9:16 (Portrait), 3:2 (Photo), 2:3 (Portrait Photo), 4:5 (Instagram). Automatically calculate and display ratio in its simplest form (GCD). Export CSS aspect-ratio property. Visual preview with scale box. The tool is completely free.

Outstanding features

Lock scale when resizing - automatically calculate remaining dimension
8 popular ratio presets ready to use
Automatically calculate ratio in its simplest form (GCD)
Display ratio in fraction and decimal
Export CSS aspect-ratio property
Visual preview with scale box
Copy dimensions, ratios, CSS with one click
Turn on/off lock ratio as needed
Completely offline processing on the browser
Completely free, unlimited use

Why is it necessary to lock aspect ratios in design and development?

Aspect ratio is the relationship between width and height of an element. Scale locking ensures images, videos, and containers are not distorted when resized. In responsive design, maintaining aspect ratio is important for: Images and thumbnails - avoid stretched or squished images. Video embeds - YouTube, Vimeo need to be exactly 16:9 so there are no black bars. Card layouts - consistent card sizes in grids. Hero sections - maintain proportions across screen sizes. Social media images - each platform has preferred ratios (Instagram 1:1, 4:5; Facebook 1.91:1; Pinterest 2:3). New CSS aspect-ratio property helps maintain ratios without padding hacks.

Benefits when used

  • Avoid distorted images and videos when resizing
  • Consistent layouts trong responsive design
  • Correct ratio for social media platforms
  • Professional image cropping and resizing
  • CSS aspect-ratio property ready
  • Fast calculations for print and digital
  • Maintain proportions in grids and cards
  • Easily convert between aspect ratios

Detailed instructions on how to use Aspect Ratio Lock

  1. 1Enter the initial width or height of the
  2. 2element Turn on
  3. 3to lock the current aspect ratio
  4. 4Change one dimension - the remaining dimension automatically calculates
  5. 5Or click preset to apply common ratios (16:9, 4:3, 1:1...)
  6. 6See ratio calculated in its simplest form
  7. 7Copy dimensions, ratio, or CSS aspect-ratio property

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