Custom Size
Enter width and height to get the ratio and quick copy text.
Unit
DPI
DPI only affects print conversions.
Aspect ratio: 1:1
Decimal ratio: 1.000
Common ratio: 1:1
Common Use Cases
Pick a scenario to see recommended sizes and ratios.
Website
Hero images, blog previews, and app icons.
Hero banner
Ratio 16:9
Full-width headers or landing pages.
Size1,920 × 1,080 px
Common ratio: 16:9
Blog preview
Ratio 300:157
Open Graph and article thumbnails.
Size1,200 × 628 px
Common ratio: Custom
App icon
Ratio 1:1
General-purpose icon size.
Size512 × 512 px
Common ratio: 1:1
Social
Post and cover sizes used by major platforms.
Instagram post (square)
Ratio 1:1
Standard feed post.
Size1,080 × 1,080 px
Common ratio: 1:1
Instagram story
Ratio 9:16
Full-screen story or reel cover.
Size1,080 × 1,920 px
Common ratio: 9:16
Facebook cover
Ratio 205:78
Page cover photo safe area.
Size820 × 312 px
Common ratio: Custom
Print
Print-ready sizes. DPI affects actual inches and centimeters.
A4 poster
Ratio 620:877
Standard A4 at 300 DPI.
Size2,480 × 3,508 px
Common ratio: Custom
Photo 4×6
Ratio 2:3
Classic photo print at 300 DPI.
Size1,200 × 1,800 px
Common ratio: Custom
A3 poster
Ratio 3508:4961
Large print at 300 DPI.
Size3,508 × 4,961 px
Common ratio: Custom
Presentation
Slide sizes for decks and kiosks.
Widescreen 16:9
Ratio 16:9
Most modern slide decks.
Size1,920 × 1,080 px
Common ratio: 16:9
Standard 4:3
Ratio 4:3
Legacy projectors or handouts.
Size1,024 × 768 px
Common ratio: Custom
Format Guide
Compare common image formats and their best uses.
JPEG
Balanced file size and quality for photos.
  • Best forPhotography, gradients
  • CompressionLossy
  • TransparencyNot supported
  • VectorNot supported
PNG
Sharp edges and transparency support.
  • Best forUI assets, screenshots
  • CompressionLossless
  • TransparencySupported
  • VectorNot supported
WebP
Modern format with strong compression.
  • Best forWeb images, mixed content
  • CompressionLossy or lossless
  • TransparencySupported
  • VectorNot supported
SVG
Vector-based and resolution independent.
  • Best forIcons, logos, illustrations
  • CompressionXML-based
  • TransparencySupported
  • VectorSupported
Tip: Use SVG for icons and logos, then export to PNG or WebP if the platform needs a bitmap.