1. Core Principle
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Images are considered part of the template content, so they must be relevant to the rest of the template content.
2. Technical Rules
Basic Requirements / Quantity
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1–3 images per image module.
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Image module (if present) must be at the top of the template (header).
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If there is an image module, the template cannot have a logo module, and vice versa.
Image Ratio
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16:9 (landscape)
Image Size
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≤ 500 KB
Image Format
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.jpg or .png
CTA Binding
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All images must include at least one CTA.
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Regardless of which image is clicked, it links to CTA1 (even if multiple CTAs exist).
Applicable Template Types
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Cannot use images in: ZNS OTP, ZNS Service Rating, ZNS Payment templates
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Can use images in all other ZNS templates.
3. Form / Style Rules
Text in Images
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Text must be clear and readable.
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Text that is too small or unclear is not acceptable.
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Total text area must not exceed 50% of the image area.
Image Clarity
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Photos must be clear and recognizable. Blurry, too small, or unrecognizable images are not accepted.
Image Editing / Cropping
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No improperly edited or cropped images.
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No QR codes or barcodes.
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No irrelevant white backgrounds.
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No frames or visible borders.
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Avoid images with multiple small sections in one layout.
Misleading / Deceptive Elements
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Images cannot contain elements that trick users into clicking:
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Fake video play buttons, stop buttons, or website elements
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Images mimicking OS dialogs (Windows, Mac, Unix) or error messages
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Contact Info
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Images cannot contain contact information (use CTA buttons for phone numbers).
Compliance
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Images must not violate Vietnamese law or Zalo platform rules.
Suggested Text Sizes
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Example: 1140px × 640px image → recommended text size ≥ 42pt, optimal 56pt
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Font sizes can vary, but must comply with ZNS product rules.
4. Brand Rules in Images
Enterprise Logo
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Logos in images must be clear and recognizable.
Other Organizations / Brands
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No logos of other brands or government organizations without authorization.
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If needed, customer must provide proof of ownership or authorization.
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Do not cover, hide, or blur parts of other brands/logos.
5. Image Content Guidelines
General Content
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Images are supplementary and must still comply with Zalo platform policies.
Content Clarity
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Images cannot be used primarily to invite users to follow the OA.
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Do not use administrative documents or official files as images (land certificates, government documents, licenses, insurance cards, contracts, etc.).
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Avoid graves, tombstones, or similar imagery.
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No tobacco, e-cigarettes, needles, knives, weapons.
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No Vietnam flags, maps, currency; no military or political imagery.
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Avoid political, gender, religious, sexual, or other sensitive topics.
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No images showing body parts enlarged beyond 50% of image area, nudity, sexual suggestions, or unnecessary focus on body parts.
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Avoid images that evoke negative emotions (illness, wounds, pain, disease, etc.).
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No impossible or shocking content; no violence or offensive content.
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No illegal product/service promotion (drugs, prohibited food, cryptocurrency, loans, etc.).
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No group chat invitations in images.
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Images must comply with Vietnamese law and Zalo platform rules during review.