Meet a lab specification
Create the exact pixel dimensions requested by a photo lab or online print service.
Private browser image resizer
Resize an image for an exact print size.
Choose the physical size and resolution you need, check whether the source is large enough, then create and download the resized file without uploading it.
Instant resultsNo signupRuns in your browser
Output image2,400 × 3,000 px8 × 10 in at 300 PPI
Choose an image to compare its source pixels with the target and enable the download.
When to use it
Start with the result you need
This calculator is most useful when one part of the print specification is known and another needs to be checked.
Prepare a standard print
Turn inches, centimetres or millimetres into a downloadable image at your selected PPI.
Check before enlarging
See immediately when the requested output exceeds the source dimensions.
The calculation
How it works
Target pixels are calculated as print inches × PPI. A 10 × 8 inch print at 300 PPI needs 3000 × 2400 pixels.
Resampling changes pixel dimensions. Reducing is usually safe; enlarging invents pixels and can make fine detail look softer.
Quick reference
Common output sizes at 300 PPI
These dimensions are useful starting points. Confirm the exact size and bleed with the printer.
| Print size | Pixel dimensions | Typical use |
|---|---|---|
| 4 × 6 in | 1200 × 1800 px | Small photo |
| 8 × 10 in | 2400 × 3000 px | Portrait print |
| A4 | 2480 × 3508 px | Document or art print |
| 12 × 18 in | 3600 × 5400 px | Large photo |
Check the numbers
8 × 10 inches at 300 PPI
The result is 2400 × 3000 pixels. A source at or above those dimensions can be reduced without upscaling.
A4 at 240 PPI
210 × 297 mm converts to approximately 1984 × 2806 pixels.
20 × 30 inches at 150 PPI
The result is 3000 × 4500 pixels, a practical poster target when it will be viewed from farther away.
Before you export
Common mistakes to avoid
Stretching the proportions
An output ratio that differs from the source will distort it. Crop to the target ratio first when proportions matter.
Assuming upscaling adds detail
New pixels smooth transitions but do not restore detail that was never captured.
Ignoring the printer profile
Pixel dimensions are only part of production. Confirm colour space, file format and bleed separately.
Resize an image for an exact print size. FAQ
Is my image uploaded?
No. Reading, resizing and downloading happen locally in your browser.
Should I use JPEG or PNG?
JPEG is efficient for photographs. PNG is useful for graphics, transparency and lossless output, but files are often larger.
Does resizing change the aspect ratio?
The tool uses the width and height you enter. If their ratio differs from the source, the image will be stretched, so use the crop preview first.
Reviewed for accuracy: 28 July 2026