Newsletter and email marketing image: max width and retina
For email newsletter image size, the 2026 reference is 600 px ancho (variable). Memorising pixels is easy; mistakes are extra margins, low resolution, or ignoring mobile safe zones. This guide covers official dimensions, common errors, and how to prepare your file — with a checklist at the end.
Quick size table
| Format | Pixels | Ratio | Notes |
|---|---|---|---|
| Estándar | 600 px ancho | variable | Mayoría clientes |
| Retina | 1200 px ancho | variable | Pantallas 2x |
| Hero email | 600 × 300 | 2:1 | Cabecera |
| Banner CTA | 600 × 200 | 3:1 | Botón visual |
Why exact size matters
Email upscales or compresses uploads. Too few pixels loses sharpness on text and logos. Extra resolution only adds weight without visible gain on mobile.
Correct ratio prevents automatic crops: cut faces, off-frame logos, or black bars. Native export is the most direct control.
In practice, most «blurry after upload» issues come from wrong canvas size, not the camera. Fixing ratio and resolution before upload usually solves it without reshooting.
If you work with an agency, put these dimensions in the brief from day one. Resizing at the end is cheap; redesigning because the banner cropped your headline is not.
Safe zone and mobile preview
Even with correct dimensions, the UI covers strips with icons and buttons. Keep headline, price, logo and CTA in the central third.
Check preview on a real phone at 50% brightness.
Common export mistakes
Avoiding these four mistakes saves re-exports and blurry posts.
- White margins included in automatic crop.
- Mixed ratios between feed, story and cover.
- Heavy PNG converted to JPG with no benefit.
- Edge text hidden by interface.
Weight, format and double compression
A well-exported JPG almost always beats a huge PNG for social. The platform will compress again; if your file is already degraded, the final result worsens.
If you edit across tools (Canva → export → WhatsApp → Instagram), each step may compress again. Keep a good-resolution master and generate network-specific versions from it.
For multi-format campaigns, design the most demanding canvas first (often 9:16 vertical or wide banner) and derive the rest with conscious cropping, not stretching.
FAQ on sizes and export
Can I upload a smaller image and let the platform scale it? You can, but you shouldn't if text and logo sharpness matter. Automatic upscale softens edges and creates visible artifacts on retina screens.
Should I export double pixels «for retina»? For web thumbnails and link previews, sometimes. On Email, visible benefit rarely justifies doubling file weight — get ratio right and export optimized JPG.
What if my design only exists in PDF or PowerPoint? Export the slide as PNG at 2× target size and run it through an adapter before upload. Avoid screenshots: they add extra compression and unpredictable margins.
Do I need CMYK color profile? Not for social media. Work in sRGB from the start; CMYK is for print and can desaturate colours when converted for screen.
Pre-publish checklist
Confirm the file matches the table dimensions exactly — not «almost» or «slightly larger».
Check text, logo and CTA are in the central safe zone, away from app icons.
Review file weight: ideally under 4 MB JPG for fast uploads and less aggressive compression.
Reuse on another network: adapt ratio with conscious cropping — never stretch.
Keep a master copy without flat text if you plan to reuse in video or animation.
Export at exact size — adapt here to Email.
