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X (Twitter) header: 1500×500 and the safe-area playbook
X (formerly Twitter) header images render at 1500×500 on desktop but get cropped heavily on mobile and the timeline view. This guide covers the spec, the safe areas, and the visual composition rules that make headers look intentional across every view.
Why 1500×500 pixels
The 1500×500 dimension is X's recommended header size. The aspect ratio is exactly 3:1. Files smaller than 1500×500 are auto-upscaled and look blurry on retina screens; files larger than 1500×500 are downscaled without quality benefit. The maximum file size is 5 MB (15 MB for animated GIF headers on premium accounts).
The safe area inside the 1500×500 frame
X's timeline view crops headers aggressively. Critical content should sit in the safe central region:
Top safe area: 60 pixels from top (covered by profile image overlap and timeline UI)
Bottom safe area: 80 pixels from bottom (covered by bio text and follow button)
Left safe area: 250 pixels from left (covered by profile photo circle)
Right safe area: 80 pixels from right (covered by follow/message buttons)
The truly safe composition area is roughly the central 1100×360 region. Anything in this zone renders fully across desktop, mobile, and timeline views.
What works in a strong header
Visual focus in the safe center (no text or faces at edges)
Brand color or single hero image with breathing room
Patterns or gradients that look intentional when cropped
Simple graphics that work at small sizes (timeline preview is roughly 600×200)
Common mistakes
Placing text in the left 250 pixels — covered by your profile photo circle
Designing for desktop only — 80%+ of X traffic is mobile
Using a low-resolution image — pixelated on retina
Crowding the header with logos or text — invisible at timeline preview size
Format and file size
Recommended size: 1500×500 pixels
Format: JPEG, PNG, GIF (animated on premium)
Max file size: 5 MB (JPEG/PNG), 15 MB (GIF)
Frequently asked questions
Can I use 1920×1080 instead? Yes, X downscales to 1500×500. No benefit unless you want a master file.
Will my header look different on mobile? Yes — mobile crops much more aggressively. Always preview on a phone before committing.
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