Resize for A3 Print

Auto-set to 3508×4961px (297×420mm at 300 DPI). Perfect for large posters and detailed prints.

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PNG, JPG, WebP, BMP — any size, mochi handles it all

Resized Image
Result
Dimensions
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File Size
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Image too small? Sharpen first

If your image is smaller than the target size, use Sharpen for better clarity, then resize.

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Type Dimensions Ratio
Print Size297×420mm
Pixels (300 DPI)3508×4961
Resolution300 DPI (print quality)
Best ForLarge posters and detailed prints

Frequently Asked Questions

What resolution do I need for a3 print?
For 297×420mm at 300 DPI (print quality), you need 3508×4961 pixels. 300 DPI ensures sharp, professional results.
What DPI should I use for printing?
300 DPI is the standard for high-quality prints. 150 DPI is acceptable for large prints viewed from a distance. Never go below 100 DPI for any print.
Can I print a small image at 297×420mm?
You can, but small images enlarged to 3508×4961 may look blurry or pixelated. For best results, start with an image at least as large as the target resolution.