How to Check Image Resolution — Windows, Mac, iPhone, Android & Online
Knowing how to check image resolution is essential whether you’re a photographer preparing files for a client, a designer laying out a print brochure, or just someone wondering if a downloaded photo is high enough quality to use. Resolution determines how sharp and detailed your image will appear — on screen and in print.
The good news? Checking image resolution is quick and free. In this guide, we’ll walk you through every method: Windows, Mac, iPhone, Android, and the easiest option of all — a free online image resolution checker that works right in your browser with zero uploads. If you just want to check your image resolution online now, skip to Section 6.
What Is Image Resolution?
Image resolution refers to the number of pixels in a digital image, expressed as width × height (e.g., 1920 × 1080). The total pixel count determines how much detail the image holds. For printing, resolution is often discussed in DPI (dots per inch) — the density of those pixels when translated to physical paper. A higher pixel count means more detail; a higher DPI means sharper prints. Understanding both is key when you want to check resolution of image files before printing or publishing.
How to Check Image Resolution on Windows
Windows makes it straightforward to check basic image resolution without any extra software:
- Open File Explorer and navigate to the folder containing your image.
- Right-click the image file and select Properties from the context menu.
- Click the Details tab. Here you’ll see the image dimensions listed as “Width” and “Height” in pixels. You’ll also see horizontal and vertical resolution (DPI) if the image contains EXIF data.
- For more details like camera model, exposure, and ISO, scroll further down the Details tab.
Limitation: Windows Properties only shows pixel dimensions and basic EXIF. It does not show print size recommendations, color profile info, megapixels, or aspect ratio. For a complete analysis, you’ll want a dedicated image resolution checker.
How to Check Image Resolution on Mac
On macOS, the Preview app gives you quick access to resolution details:
- Open the image in Preview (double-click the file, or right-click → Open With → Preview).
- From the menu bar, select Tools → Show Inspector (or press ⌘ + I).
- In the Inspector window, click the General Info tab (the “i” icon). You’ll see the image dimensions in pixels.
- Click the More Info tab (the “i in a circle” icon) to see DPI, color space (sRGB, Adobe RGB, etc.), and whether an ICC profile is embedded.
Limitation: Preview shows pixel dimensions and some metadata, but it doesn’t calculate megapixels, recommend print sizes with quality ratings, or display EXIF camera settings in an organized way. For batch analysis of multiple images, an online image resolution checker is much faster.
How to Check Image Resolution on iPhone
On iOS, the Photos app hides resolution details, but you can find them:
- Open the Photos app and select your image.
- Swipe up on the image (or tap the ⓘ icon on newer iOS versions).
- A panel slides up showing basic metadata. You may see the file size and date.
- For pixel dimensions and more detailed EXIF, you’ll need a third-party app from the App Store, or — more conveniently — use a browser-based image resolution checker that works on iPhone without installing anything.
Pro tip: Safari on iPhone fully supports drag-and-drop and file selection, so you can check how to check image resolution on iPhone right at imageresolutionchecker.com. Just visit the site, tap “click to browse,” and select your photo. The tool reads pixel dimensions, DPI, megapixels, and print size — all in your mobile browser.
How to Check Image Resolution on Android
Android devices offer several ways to check resolution:
Method 1 — Google Photos:
- Open the image in Google Photos.
- Swipe up on the photo (or tap the three-dot menu → Details).
- You’ll see the pixel dimensions listed along with file size, date, and sometimes camera info.
Method 2 — Gallery/My Files:
- In your default Gallery app, open the image and tap the ⋮ menu or Details.
- Some Android skins (Samsung, OnePlus) show dimensions directly in the file info.
Limitation: Like iOS, built-in Android apps rarely show comprehensive resolution analysis — no DPI readout from EXIF, no print size calculator, no color profile detection. For the full picture when asking “how to check resolution of image on Android,” your best bet is the online tool at imageresolutionchecker.com.
How to Check Image Resolution Online — The Easiest Method
The fastest, most complete way to check image resolution online is using our free Image Resolution Checker. Here’s why it beats every other method:
- Zero uploads — All analysis happens in your browser. Your image never leaves your device.
- Instant results — Drop an image and see pixel dimensions, megapixels, DPI, print size recommendations, EXIF data, color profile, and aspect ratio — all in one dashboard.
- Works on any device — Windows, Mac, iPhone, Android, iPad — if you have a modern browser, it works.
- Batch processing — Analyze multiple images at once and compare results side-by-side.
- Export — Download results as CSV or JSON.
- Completely free — No sign-up, no limits, no ads that track you.
Try the Image Resolution Checker →
Supported Formats
The tool reads resolution from JPEG, PNG, WebP, AVIF, TIFF, GIF, BMP, and even SVG files. For raster formats, it extracts pixel dimensions directly from the file headers. For SVG, it reads viewBox or width/height attributes.
What Resolution Do You Need?
Not all uses require the same resolution. Here’s a quick reference:
| Use Case | Recommended Resolution | DPI |
|---|---|---|
| Web images / social media | 1200–2000 px wide | 72 DPI |
| Small prints (4×6, 5×7) | 1800 × 1200 px minimum | 300 DPI |
| Medium prints (8×10, A4) | 3000 × 2400 px minimum | 300 DPI |
| Large prints (16×20) | 6000 × 4800 px minimum | 300 DPI |
| Posters (24×36) | 10800 × 7200 px minimum | 300 DPI |
| Professional photo prints | Varies — use 300 DPI rule | 300 DPI |
Need a more detailed print size chart? Check out our image resolution for printing guide.
Wrapping Up
No matter what device you’re on, you now know exactly how to check image resolution. For quick checks, the built-in tools on Windows and Mac work fine. For mobile, the online tool is far more convenient than installing extra apps. But for the most complete analysis — pixel dimensions, DPI, megapixels, EXIF metadata, color profile, print size recommendations, and batch comparison — nothing beats the free Image Resolution Checker.
Next step: Drag your first image onto the tool and see everything in seconds. No upload. No hassle. 100% private.