Resize Image to A4 Size Online Free
Choose DPI and orientation — resize any photo or image to exact A4 pixel dimensions for print or PDF
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A4 Image Dimensions at Every DPI
A4 is 21×29.7 centimeters (8.27×11.69 inches). The pixel size depends entirely on DPI — the same physical A4 sheet needs a different number of pixels depending on whether you are printing it at home, at a photo lab, or displaying it on screen. The table below covers the four most common DPI values.
| DPI | Portrait (px) | Landscape (px) | Best for |
|---|---|---|---|
| 72 DPI | 595 × 842 | 842 × 595 | PDF screen view, email |
| 96 DPI | 794 × 1123 | 1123 × 794 | Windows screen, presentations |
| 150 DPI | 1240 × 1754 | 1754 × 1240 | Office print, documents, forms |
| 300 DPI | 2480 × 3508 | 3508 × 2480 | Professional print, photo lab |
Common A4 Image Use Cases
Printing a photo on A4 paper
To fill an A4 sheet at a photo lab or home printer, use 300 DPI (2480×3508px). This gives a sharp print with no visible pixels at normal viewing distance.
Inserting image into Word or Google Docs
Word and Google Docs use A4 as the default page size. Inserting an image at 150 DPI (1240×1754px) keeps the file small while looking sharp when printed or shared as a PDF.
Creating an A4 PDF
PDF viewers use 72 DPI as the base for A4 — 595×842px. For a PDF that will be printed, use 150 or 300 DPI to ensure print quality is not lost.
Scanning and re-saving at A4
Scanned documents are often saved at non-standard sizes. Resize to A4 at your target DPI to standardize the dimensions before archiving or printing.
A4 vs Other Paper Sizes
| Size | Dimensions (cm) | At 300 DPI (px) | Common use |
|---|---|---|---|
| A3 | 29.7 × 42 cm | 3508 × 4961 | Posters, large format |
| A4 | 21 × 29.7 cm | 2480 × 3508 | Standard documents |
| A5 | 14.8 × 21 cm | 1748 × 2480 | Booklets, flyers |
| US Letter | 21.59 × 27.94 cm | 2550 × 3300 | US standard documents |
Related Tools
- Resize Image to CM — resize to any centimeter dimensions at any DPI
- Resize Image to Inches — resize using inch measurements (US Letter, 4×6, 8×10)
- Resize Image — resize to exact pixel dimensions
- Compress Image — reduce file size after resizing
Frequently Asked Questions
What is A4 size in pixels at 300 DPI?▼
A4 (21×29.7 cm) at 300 DPI is 2480×3508 pixels in portrait orientation. At 150 DPI it is 1240×1754 pixels. At 72 DPI it is 595×842 pixels — the standard PDF screen size.
What is A4 in pixels at 150 DPI?▼
A4 at 150 DPI is 1240×1754 pixels (portrait). This is the standard size for inserting A4 images into Word documents and Google Docs for printing on a home or office printer.
What is A4 at 72 DPI?▼
A4 at 72 DPI is 595×842 pixels — the standard PDF page size used by Adobe Acrobat, macOS Preview, and most PDF viewers. Use 72 DPI for screen-only PDFs and presentations.
Is A4 the same as US Letter?▼
No. A4 is 21×29.7 cm (8.27×11.69 inches). US Letter is 8.5×11 inches (21.59×27.94 cm). A4 is slightly taller and narrower than Letter. Use the Resize Image to Inches tool for US Letter dimensions.
How do I resize an image to A4 for printing?▼
Select 300 DPI in the tool above, keep Portrait orientation, and click Resize Image. The output will be 2480×3508 pixels — the exact size for printing at A4 at professional print quality.
Is my image uploaded to a server?▼
No. All resizing happens entirely in your browser using the Canvas API. Your image file never leaves your device.