A4 Image Print Resolution Checker
Standard A4 size is 210 × 297 mm (8.27 × 11.69 inches). For professional, razor-sharp prints at 300 DPI, your image must be at least 2480 × 3508 pixels. Upload your file to verify instantly.
At 300 DPI (Gallery Sharp): Minimum 2480 × 3508 pixels.
At 150 DPI (Poster Viewing): Minimum 1240 × 1754 pixels.
A4 Print Guide
Everything you need to print A4 Paper sharp
A4 is the most widely used paper size in the world outside the US and Canada. It is the standard for letters, documents, flyers, menus and certificates, and a popular size for art prints in Europe, the UK and Australia.
Every A size has the same shape: fold an A3 sheet in half and you get A4, fold that and you get A5. That means one A4 file can be scaled up to A3 or down to A5 without cropping, as long as it has enough pixels.
For an A4 print you hold in your hand, 300 DPI is worth aiming for. A typical 12 megapixel phone photo (4032 × 3024) is big enough, even after trimming it to A4’s slightly longer shape. An image saved from Instagram (1080 × 1350) is not: it reaches only about 115 DPI at A4 and would need upscaling by about 2.6×.
A4 at a glance
| Size | 210 × 297 mm · 21 × 29.7 cm · 8.27 × 11.69 in |
|---|---|
| Shape (aspect ratio) | 1 : 1.414 (ISO paper shape) |
| Common uses | Flyers, business documents, art prints, portfolio pages, certificates. |
Pixels needed for A4
| Resolution | Pixels (width × height) | Megapixels | Best for |
|---|---|---|---|
| 300 DPI | 2480 × 3508 | 8.7 MP | Close up (photos, cards, documents) |
| 240 DPI | 1984 × 2806 | 5.6 MP | Framed and wall prints |
| 150 DPI | 1240 × 1754 | 2.2 MP | Posters viewed from a distance |
Pixel sizes are for portrait. For landscape, swap width and height.
Tips for printing at A4
- A4 is not US Letter. Letter is 8.5 × 11 inches: wider and shorter than A4 (8.27 × 11.69). Printing an A4 file on Letter paper, or the other way round, means scaling or cropping a little.
- Printing edge to edge? Add 3 mm of bleed on every side. An A4 with bleed is 216 × 303 mm, or 2551 × 3579 pixels at 300 DPI.
- Most home printers leave a white margin of a few millimetres. Keep important text and detail at least 5 mm from the edge.
- Text-heavy designs such as flyers and certificates print sharpest as a PDF with real text rather than as a flattened image.
A4 questions
How many pixels is A4 at 300 DPI?
2480 × 3508 pixels in portrait, or 3508 × 2480 in landscape. At 150 DPI it is 1240 × 1754 pixels.
Can I print an Instagram photo at A4?
Not sharply. A 1080 × 1350 image gives about 115 DPI at A4, so it will look soft up close. Use the original photo if you have it, or upscale it about 2.6× with an AI upscaler.
What is the difference between A4 and 8.5 × 11?
A4 is 210 × 297 mm (8.27 × 11.69 in), US Letter is 216 × 279 mm (8.5 × 11 in). They are close but not the same shape, so a file made for one needs a small crop or white border on the other.
Simple Process
How PrintCheck Works
Three quick steps to ensure your physical prints never come out blurry or pixelated.
Input Target Dimensions
Specify the physical width and height in millimeters (mm) along with your required DPI (300 DPI fine art or custom DPI).
Upload Your Image
Select your image file. We read its pixel size and format, then delete it straight away. Your image is never kept.
Get 3-Tier Results
Instantly view whether your image passes, qualifies for AI upscaling, or requires a higher-resolution file.
Built For Print Shops & Designers
Everything You Need for Quality Control
Exact Pixel Formula
Automates (mm / 25.4) * DPI calculation instantly for any custom physical size.
Privacy-First Processing
Your image is only held while it is being checked, then deleted. We never keep, share or look at your images.
Smart AI Upscale Detection
Detects images that can be saved using modern AI upscaling up to 4× enlargement.
Standard Print Sizes & Pixel Resolution
Reference chart of required pixel dimensions for standard photo, poster, and paper formats.
Pixels = Inches × Target DPI
Example for 8×10" at 300 DPI: (8 × 300) = 2400 px width, (10 × 300) = 3000 px height.
Pixels = (Millimeters ÷ 25.4) × Target DPI
Example for A4 (210×297 mm) at 300 DPI: (210 ÷ 25.4 × 300) = 2480 px, (297 ÷ 25.4 × 300) = 3508 px.
| Print Format | Inches | Metric (mm) | 300 DPI (Gallery Sharp) | 150 DPI (Poster Standard) | Instant Check |
|---|---|---|---|---|---|
| A4 Paper (ISO Standard) | 8.27 × 11.69" | 210.0 × 297.0 mm | 2480 × 3508 px | 1240 × 1754 px | Check A4 |
| A3 Poster (ISO Standard) | 11.69 × 16.54" | 297.0 × 420.0 mm | 3508 × 4961 px | 1754 × 2480 px | Check A3 |
| A5 Booklet (ISO Standard) | 5.83 × 8.27" | 148.0 × 210.0 mm | 1748 × 2480 px | 874 × 1240 px | Check A5 |
| 4x6" Photo (US Photo) | 4.0 × 6.0" | 101.6 × 152.4 mm | 1200 × 1800 px | 600 × 900 px | Check 4×6" |
| 5x7" Photo (US Photo) | 5.0 × 7.0" | 127.0 × 177.8 mm | 1500 × 2100 px | 750 × 1050 px | Check 5×7" |
| 8x10" Print (US Photo & Art) | 8.0 × 10.0" | 203.2 × 254.0 mm | 2400 × 3000 px | 1200 × 1500 px | Check 8×10" |
| 11x14" Print (US Wall Art) | 11.0 × 14.0" | 279.4 × 355.6 mm | 3300 × 4200 px | 1650 × 2100 px | Check 11×14" |
| 12x18" Poster (Posters) | 12.0 × 18.0" | 304.8 × 457.2 mm | 3600 × 5400 px | 1800 × 2700 px | Check 12×18" |
| 18x24" Poster (Posters) | 18.0 × 24.0" | 457.2 × 609.6 mm | 5400 × 7200 px | 2700 × 3600 px | Check 18×24" |
| 24x36" Poster (Posters) | 24.0 × 36.0" | 609.6 × 914.4 mm | 7200 × 10800 px | 3600 × 5400 px | Check 24×36" |
Answers To Common Questions
Frequently Asked Questions
Print Guides
Learn how to get sharp prints
How to Check an Image’s Resolution on Windows, Mac, iPhone and Android
Step-by-step for every device, which number to look at, and which one to ignore.
How to Print AI Art Sharp: Sizes, Upscaling and Common Problems
How far a 1024 px image goes, the upscale factor for popular sizes, and what to fix before printing.
Print-on-Demand Image Requirements: A Guide for Gelato, Printful and Printify Sellers
Resolution, templates, transparency and colour: how to prepare designs that print well on shirts, mugs and wall art.
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