Whether you’re planning a street promotion or an in-store campaign, choosing the right poster size is the first step to delivering your message effectively. The size of your poster doesn’t just affect the visual appeal — it also determines its compatibility with display locations, viewing distance, and budget allocation.
This guide by Flyer King Hong Kong will walk you through the most common poster sizes, practical usage tips across different industries, and key design and printing considerations — helping you plan your promotional materials with precision and impact.
🔹 Common Poster Sizes (in millimeters)
| Size | Dimensions (mm) | Ideal For |
|---|---|---|
| A3 | 297 x 420 | Community boards, company notices, corridor displays |
| A2 | 420 x 594 | Small exhibitions, event entry posters |
| A1 | 594 x 841 | Shopfront posters, street promotions, event ads |
These are part of the ISO 216 A-series, the most widely used paper standards for printing, ensuring smooth design and production.
🔹 Special Sizes & Custom Applications
Besides the A-series, some settings may benefit from alternative or custom poster dimensions:
- B-series (e.g. B1: 707 x 1000 mm) – popular for cinema or lightbox advertising, offering a wider visual layout.
- Street display sizes (e.g. 500 x 700 mm / 600 x 900 mm) – optimized for outdoor display boards with great flexibility.
Custom cuts – tailor-made for creative or oversized campaigns, such as panoramic or vertical long posters.
🔹 How to Choose the Right Poster Size
When selecting the perfect size, consider these four key factors:
- Display Location
- Indoor: A3 or A2 for visibility in limited spaces.
- Outdoor: A1 or larger for long-distance readability.
- Indoor: A3 or A2 for visibility in limited spaces.
- Viewing Distance
- 1–2m: A3–A2 sizes are sufficient.
- 3m or more: A1 or larger recommended.
- 1–2m: A3–A2 sizes are sufficient.
- Content Type
- Text-heavy designs suit vertical (portrait) formats.
- Visually driven designs work well in landscape or custom layouts.
- Text-heavy designs suit vertical (portrait) formats.
- Budget
- Larger posters cost more to print and mount.
- For smaller campaigns, A3 or A2 offers the best balance between cost and visibility.
- Larger posters cost more to print and mount.
🔹 Why Posters Still Work
In the digital era, posters remain one of the most cost-effective marketing tools for building awareness and driving action.
✅ Increase Visibility – Stay in front of high-footfall audiences for extended periods.
✅ Clear Messaging – Large design areas allow for easy-to-read, visually strong communication.
✅ Drive Immediate Action – Include QR codes or promo codes to encourage instant engagement.
✅ High ROI – Low-cost, high-impact exposure compared to online or broadcast media.
🔹 Design & Printing Tips
To ensure your posters look sharp and print flawlessly:
- Use CMYK color mode to avoid color inconsistencies.
- Set image resolution to 300dpi or above for crisp visuals.
- Leave at least 3mm bleed to prevent edge trimming issues.
- Confirm dimensions and file specs with your printer in advance to minimize rework or delays.
🔹 Let Flyer King Handle It for You
From poster design to printing and on-site placement, Flyer King provides a one-stop service that ensures your campaign runs smoothly and effectively.
With years of experience in street promotions and poster advertising across Hong Kong, we understand crowd flow, venue requirements, and placement strategies to help your brand achieve maximum exposure.
We’ll help you:
- Recommend the best poster size and print material for your campaign
- Handle design, production, and installation end-to-end
- Optimize placement timing and locations for the best results
📍 Recommended Poster Sizes: A1, A2
📍 Popular Posting Districts: Mong Kok, Tsim Sha Tsui, Central, Sheung Wan, Sai Ying Pun, Wan Chai, Causeway Bay
💬 Contact Us Today: https://wa.me/85294046128