Image DPI Calculator
Calculate print size or DPI for a given image — upload it to auto-fill the pixel dimensions.
Calculated locally in your browser.
- Free — no signup, no account, no watermark
- Runs entirely in your browser — nothing is uploaded to a server
- Works on mobile, tablet and desktop
- Instant — results appear as soon as you enter your input
Why this is private
- Calculated locally in your browser.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Calculates the physical print size of an image at a target DPI, or the DPI needed to print at a target physical size. Upload the image to auto-fill its pixel dimensions, or type them in directly if you already know them.
How to use it
- 1Upload the image (optional) to auto-fill its pixel dimensions, or type them in.
- 2Enter either a target DPI or a target print size.
- 3The other value is calculated instantly.
Formula
Print size
inches = pixels / DPI
Frequently asked questions
What people use it for
Check whether a photo is big enough to printUpload the photo (or enter its pixel size) and the print size you want to see the DPI you'd actually get — under ~200 will look soft.
Work out the print size at 300 DPIFind the largest sharp print a given image supports before you send it to a lab or a printer.
Spec an export for a specific printGiven a target size in inches or cm and a target DPI, get the pixel dimensions to export from your editor.
Sanity-check a stock or client imageUpload the file to confirm it has the resolution the layout needs, without hunting down its properties first.
Related guides
- How to resize a photo and signature for online formsApplication portals want the photo and signature at exact pixel sizes and tiny file sizes. Here's how to hit both without an app.
- How to compress images for the web without them looking badWhy images make pages slow, how much quality you can drop before anyone notices, and a repeatable way to hit a size target.
- How to resize an image without losing qualityWhat 'without losing quality' really means when you resize, why enlarging is different from shrinking, and how to keep proportions intact.
- JPG, PNG or WebP: which image format should you use?A practical guide to picking an image format — what each one is good and bad at, and when to convert.
Related tools
All image toolsImage Size CalculatorEstimate a real JPG/PNG/WebP file size, or the raw uncompressed size, from dimensions.Resize ImageResize images to exact pixel dimensions or a percentage — one image or a whole batch.Compress ImageReduce image file size while controlling quality — one image or a whole batch.Crop ImageCrop an image to a custom or preset aspect ratio.
Ready to use Image DPI Calculator?
Image DPI Calculator