Here are all the Twitter Images and specifications:

Profile Photo: 400 x 400 (Displays 200 x 200)

Image Guidelines

  • Square Image recommended 400 x 400 pixels.
  • Maximum file size 2 MB.
  • Image types include: JPG, GIF or PNG.

 

Header Photo: 1,500 x 500

Image Guidelines

  • Recommended 1,500 x 500 pixels.
  • Maximum file size of 5 MB.
  • Image types include: JPG, GIF or PNG.

 

In-Stream Photo: Minimum 440 x 220 (2:1 Ratio)

Image Guidelines

  • Minimum to appear expanded 440 x 220 pixels (a 2:1 ratio).
  • Can tweet up to 4 images at one time.
  • Can edit images if tweeting from Twitter iOS or Android app.
  • Maximum to appear expanded 1024 x 512 pixels.
  • Appears in stream collapsed at 506 x 253 pixels on desktop.
  • Maximum file size of 5 MB for photos, and 3 MB for animated GIFs.