How-to guide
How to Prepare Images for Printing — Resolution and File Size Guide
To prepare an image for printing, calculate the required pixel dimensions by multiplying your print size in inches by the DPI — 300 for standard printing, 150 for large format — then resize the image to those dimensions using Pictuary's Resize tool. Export as JPEG at quality 90+ for photographs or PNG lossless for graphics with text or sharp edges.
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Why print requires more pixels than web
Web images are measured in pixels displayed on a screen. Print images are measured in dots of ink per inch on physical media. These are different resolution systems with different requirements.
A website image displayed at 1200 px wide on a 96 DPI monitor occupies approximately 12.5 inches on screen. The same 1200 px image printed on paper at 300 DPI occupies 4 inches. At 4 inches, 1200 px is sufficient for sharp reproduction at close viewing distance. But to print that image at 8×10 inches at 300 DPI, you need 2400×3000 px — more than double the pixel count.
Print resolution requirements are determined by two factors:
- The physical size of the print (in inches or centimeters)
- The DPI — dots per inch — of the output
The higher the DPI, the more pixels are required to fill a given physical area at print quality.
Standard DPI requirements for print
| Print type | Minimum DPI | Standard DPI | Notes |
|---|---|---|---|
| Photographs (standard size) | 200 | 300 | Below 200 visible at arm's length |
| Marketing materials | 300 | 300 | Leaflets, brochures, business cards |
| Magazine and editorial | 300 | 300–350 | Some publications specify 350 |
| Large format (banners) | 100 | 150 | Viewed from 1 m+ distance |
| Exhibition displays | 72–100 | 100–150 | Viewed from 2 m+ distance |
| Fine art prints | 300 | 300–600 | Higher for gallery reproduction |
How to calculate required pixel dimensions
The formula is: pixel dimension = print size in inches × DPI
Common print sizes at 300 DPI:
| Print size | Width × Height (inches) | Required pixel dimensions at 300 DPI |
|---|---|---|
| 4×6 photo | 4 × 6 in | 1200 × 1800 px |
| 5×7 photo | 5 × 7 in | 1500 × 2100 px |
| 8×10 photo | 8 × 10 in | 2400 × 3000 px |
| A5 (half A4) | 5.83 × 8.27 in | 1748 × 2480 px |
| A4 | 8.27 × 11.69 in | 2480 × 3508 px |
| A3 | 11.69 × 16.54 in | 3508 × 4961 px |
| US Letter | 8.5 × 11 in | 2550 × 3300 px |
| US Tabloid | 11 × 17 in | 3300 × 5100 px |
Common large-format sizes at 150 DPI:
| Print size | Width × Height (inches) | Required pixel dimensions at 150 DPI |
|---|---|---|
| A2 poster | 16.54 × 23.39 in | 2481 × 3508 px |
| A1 poster | 23.39 × 33.11 in | 3508 × 4961 px |
| 24×36 banner | 24 × 36 in | 3600 × 5400 px |
| 48×72 banner | 48 × 72 in | 7200 × 10800 px |
Checking if your source image is large enough
Before resizing, calculate the maximum print size your source image supports at 300 DPI:
Max print width (inches) = source pixel width ÷ DPI target
Examples:
- iPhone 16 photo (4032 px wide) ÷ 300 DPI = 13.4 inches — supports up to approximately A3 wide at 300 DPI
- 12-megapixel camera (4000×3000 px) ÷ 300 DPI = 13.3 × 10 inches — slightly over A4 landscape
- 24-megapixel camera (6000×4000 px) ÷ 300 DPI = 20 × 13.3 inches — close to A2
If your source image is smaller than the print requirement:
- Pictuary will not upscale it — withoutEnlargement applies
- Upscaling adds pixels through interpolation without real detail — print sharpness degrades
- The solution is a higher-resolution source: use the original camera file, a RAW export, or a re-taken photo
JPEG vs PNG for print — why format matters more at print resolution
At screen display sizes, the compression artifacts from JPEG quality 80–85 are imperceptible at normal viewing distance. At print resolution — 300 DPI, viewed at 30–50 cm — the same artifacts can become visible, particularly on sharp edges, text, and high-contrast boundaries.
The distinction:
JPEG quality 90+ — appropriate for photographs. Photographic content (continuous-tone, many gradual color transitions) is what JPEG's encoding is optimized for. At quality 90, compression artifacts are minimal and imperceptible in photographs even at close print viewing distance. File sizes at 300 DPI are typically 2–8 MB for standard print sizes.
PNG lossless — appropriate for graphics, logos, diagrams, and any image with text. Lossless encoding stores every pixel exactly. Sharp text rendered at 300 DPI on a PNG is as sharp as the pixel grid allows — no softening, no artifact fringing. File sizes are larger — typically 10–50 MB for A4 at 300 DPI — but within the upload limits of all professional print services.
JPEG below quality 85 for print — not recommended. At print viewing distances, quality settings below 85 introduce visible artifacts that are absent at web viewing distances. If you have previously compressed a file for web at quality 75–80, use the original source for print rather than the web-optimized version.
DPI in file metadata — does it matter?
Many image editing tools embed a DPI value in the file's EXIF or IPTC metadata — for example, "72 DPI" for a web image or "300 DPI" for a print file. This is a hint to software, not a hard constraint.
What determines print sharpness is the actual pixel count relative to the physical print size — not the embedded DPI value. A 2480×3508 px image will always print at 300 DPI on A4 regardless of whether its metadata says 72 DPI or 300 DPI.
Pictuary strips all EXIF metadata from processed images — including any embedded DPI hint from the EXIF or IPTC fields. This does not affect print quality — the pixel dimensions remain unchanged.
Step by step
Calculate the pixel dimensions you need for your print size
Multiply your print dimensions in inches by your target DPI. Use 300 DPI for standard printing (documents, photos, marketing materials). Use 150 DPI for large-format printing (banners, posters over A2 size, exhibition prints viewed from a distance of 1 meter or more). Examples: A4 at 300 DPI = 2480×3508 px. A3 at 300 DPI = 3508×4961 px. 5×7 inch photo at 300 DPI = 1500×2100 px. 24×36 inch banner at 150 DPI = 3600×5400 px. If your source image is smaller than the required pixel dimensions, Pictuary will not upscale it — you need a higher-resolution source.
DPI / PPI — Dots Per Inch — a measure of print resolution. 300 DPI means 300 dots of ink are printed per linear inch. Higher DPI produces sharper printed results. The standard for quality print is 300 DPI. For web images, DPI is irrelevant — only pixel dimensions and file size matter. See full definition →Upload your image to the Resize tool
Go to pictuary.com/resize and upload your source image. For the best print results, start from the original camera file or RAW export — not a previously compressed web image. Pictuary accepts JPEG, PNG, WebP, and HEIC. No account is required.
Pixel dimensions — The width and height of an image measured in pixels. For print, the required pixel dimensions are determined by multiplying the print size in inches by the DPI. For web images, pixel dimensions are determined by the display container size. See full definition →Enter the required pixel width
Enter the pixel width calculated in Step 1. Leave the height blank — Pictuary scales proportionally. If the target dimensions require a specific aspect ratio that differs from your source image, you will need to crop first using Pictuary's Social Media tool at pictuary.com/crop. Pictuary will not upscale images beyond their source pixel dimensions — if the source is smaller than the print requirement, a larger source is needed.
Download and export at print quality
For photographs going to print, use JPEG at quality 90 or above — this minimizes compression artifacts that become visible at print resolution. For graphics, logos, or images with text, use PNG lossless — lossless encoding ensures every pixel is preserved exactly, which matters for sharp text and geometric edges at 300 DPI. Click Resize & Download, then use Compress if switching to PNG or adjusting JPEG quality.
Verify before sending to the printer
Confirm the pixel dimensions match the required calculation. Confirm the format — JPEG quality 90+ for photographs, PNG lossless for graphics. Confirm the file size is within the printer's upload limit if submitting digitally (typically 50–200 MB for professional print services). Pictuary deletes all files within 15 minutes of processing.