Image Resolution Checker
Find out instantly whether your images are big enough. Drop a batch of files to see each image’s pixel dimensions, megapixels, aspect ratio and orientation, and check them against common screen and print requirements.
- Files stay on your device
- No sign-up
- Free to use
| File | Width × height | Megapixels | Aspect ratio | Orientation | File size | Bits per pixel | Suitable? |
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How to use Image Resolution Checker
- Drop one or more images onto the upload area, or paste an image.
- Review the table: dimensions, megapixels, aspect ratio, orientation, file size and compression level.
- Choose a target such as a 4K screen or an A4 print to mark which images are large enough.
- Download the results as a CSV file for your records or a spreadsheet.
Image Resolution Checker features
Batch inspection
Check up to 200 images in one go, including SVG files.
Real pixel dimensions
Reads the actual decoded size, with phone orientation applied, rather than a possibly stale metadata value.
Simplified aspect ratio
Shows exact ratios such as 3:2, or the nearest common ratio for unusual sizes.
Suitability check
Compare against Full HD, 4K, Instagram, website hero images and common print sizes.
Compression indicator
Bits per pixel reveals heavily compressed files that may look worse than their size suggests.
CSV export
Download the full table for asset audits and reports.
When to use Image Resolution Checker
- Checking customer-supplied photos before printing them.
- Auditing a website’s image library for undersized or oversized files.
- Confirming that stock photos meet a publication’s minimum size.
- Sorting phone photos and screenshots by orientation and size.
- Preparing a list of image specifications for a designer or developer.
Image Resolution Checker FAQ
What is image resolution?
In everyday use it means the pixel dimensions of an image, such as 4000 × 3000. More pixels mean more detail and a larger possible print or display size. Megapixels are simply width times height divided by one million.
How many megapixels do I need for printing?
At 300 DPI, a 6 × 4 inch print needs about 2.2 megapixels, an A4 print about 8.7 megapixels, and an A3 print about 17.4 megapixels. Prints viewed from further away can use fewer.
What does bits per pixel tell me?
It is the compressed file size divided by the number of pixels. Typical high-quality JPGs use 1–4 bits per pixel. Values far below 1 suggest strong compression, which can show as blockiness, while PNG screenshots often use more.
Why does my photo show different dimensions here than in my file browser?
Phones often store photos sideways with an orientation tag. This tool applies that tag, so a portrait photo is reported as portrait, as you see it.
Can I check the DPI as well?
Use the Image DPI Checker, which reads the DPI stored in the file and calculates physical print sizes.
What “high resolution” really means
Whether an image is high resolution depends entirely on where it will be used. A 1080-pixel square is perfect for an Instagram post but too small for a desktop wallpaper, and a 12-megapixel photo is ample for a magazine page but would look soft on a large billboard viewed up close. The useful question is not “how many pixels does it have?” but “does it have enough pixels for this purpose?”, which is what the target selector answers.
For screens, compare the image’s pixel dimensions with the display or layout size. High-density displays such as Retina screens use two or three physical pixels per layout pixel, so a website image shown 1200 pixels wide benefits from a 2400-pixel source. For print, multiply the print size in inches by the required DPI, typically 300 for close viewing.
File size is a poor guide to resolution. A heavily compressed JPG can be small yet have large dimensions, and a screenshot saved as PNG can be large with modest dimensions. The bits-per-pixel column helps spot images that have been compressed so much that their nominal resolution overstates their real quality.
Aspect ratio matters as much as size when an image must fill a fixed frame. A 4:3 photo placed in a 16:9 banner will either be cropped or show bars. Checking ratios across a batch before designing a layout avoids surprises later; the Image Aspect Ratio Calculator helps with the arithmetic.