Classroom posters make learning environments more engaging, remind students of key concepts, and celebrate achievement. Whether you are a primary school teacher, a secondary school subject specialist, or an early years practitioner, creating effective classroom display materials is part of the job. At imgresizr.com, you can create classroom poster images at A3 and A2 display sizes, completely free.
Classroom Poster Sizes
| Size | Dimensions (300dpi) | Best For |
|---|---|---|
| A3 | 3508×4961px portrait | Standard classroom display |
| A2 | 4961×7016px portrait | Large display boards |
| A4 | 2480×3508px portrait | Student reference posters |
| Square (social) | 1080×1080px | Digital classroom / Teams |
How to Create Classroom Posters at imgresizr.com
Open imgresizr.com and set your canvas to A3 dimensions (3508×4961px) for a standard classroom display poster. Use a bright, engaging background colour — primary colours for younger students, deeper academic tones for secondary. Use the Caption tool to add your topic heading in large, bold text at the top. Break the content into clear visual sections — use boxes, bullet points, and numbered lists. For subjects like maths or science, create clear diagrams or tables. For history or literacy, include key vocabulary. Keep fonts large enough to read from a desk — minimum 24pt at 300dpi for body text. Export as a high-resolution PNG for printing at A3 from a school printer or print shop.
Classroom Poster Design Tips
- Use dyslexia-friendly fonts like Arial or Comic Sans for accessibility
- Avoid dark text on dark backgrounds — maximum contrast improves readability for all students
- Include simple illustrations or icons — visuals support different learning styles
- Laminate printed posters before displaying to prevent wear
- Keep key information to a maximum of 5–7 bullet points per poster
Create vibrant classroom display posters at A3 print size, free at imgresizr.com.