What size is a 3×3 Letter birthday poster?
About three Letter sheets wide and three tall before margins — a strong photo-wall size for living rooms and classrooms.
庆祝场景
可在家打印的儿童生日海报
派对背景墙和拍照墙不必去印刷店。SmartPrint 把生日设计拼到 Letter 纸上，客人到来前就能组装大幅彩色海报。
3×3 Letter · 9 张 · 窗格拼接9 sheets
打开生日预设
生日墙 · 3×3
3×3 · 9 sheets · Letter
- Best for party photo walls, entrance signs, and dessert-table backdrops
- Window-pane mode makes first-time assembly easier for busy parents
- Works with phone photos, Canva exports, and AI party graphics
分步操作
- Open the birthday preset in SmartPrint (Letter, 3×3, window-pane).
- Upload your party photo or graphic — files stay on your device.
- Preview the grid and nudge the crop so faces stay off the seams.
- Export the tiled PDF and print every page at actual size / 100%.
- Tape from the back, hang with removable strips, celebrate.
实用提示
- Print a single center tile first to check colors on your ink set.
- Matte paper reduces glare in flash photos of the party wall.
- Add the child’s name in the source file before tiling for a custom look.
常见问题
Can I use a phone photo?
Yes. Use the highest-resolution original, not a compressed chat download.
Window-pane or seamless?
Window-pane is faster for same-day parties. Seamless looks cleaner if you have time to trim overlaps.