Free · Browser-only · No upload

Free Image Size Checker:

Dimensions & File Size Online

Use this free image size checker to inspect pixel dimensions, file weight, format, aspect ratio, megapixels, and orientation — upload, drag and drop, or paste from clipboard. Everything runs locally in your browser with no account and no server upload.

Runs locallyCopy-ready resultsJPG · PNG · WebP · GIF

Image size checker — drop or paste an image below

Choose an image

Drag & drop, click to browse, or paste from clipboard (Ctrl+V / Cmd+V)

Tip: copy an image, then press Ctrl+V or Cmd+V here

Upload an image to get a copy-ready summary.

Images are processed locally in your browser — nothing is uploaded to check dimensions.

The fastest way to check image size online

Need an image size checker that works instantly? This free online image size checker runs entirely in your browser — skip desktop apps and slow server uploads. Upload a photo, paste a screenshot, or try the sample image to see exact pixel dimensions, file size in KB or MB, format, simplified aspect ratio, megapixels, and landscape or portrait orientation. Compare your image against YouTube thumbnail, Open Graph, square post, and vertical story targets, then resize or optimize a local copy before you publish. Every check stays on your device for faster results and complete privacy.

How to use this image size checker in 3 steps

01

Add an image

Choose a file, drag it into the image size checker, paste from clipboard, or try the sample image. Files load in memory — there is no cloud upload step. We support JPG, PNG, WebP, GIF, BMP, and HEIC from iPhone.

02

Read the metrics

Review width, height, file size, format, aspect ratio, megapixels, and orientation at a glance. The image size checker also flags whether file weight is light, moderate, or large for web and email use.

03

Act on the result

Copy dimensions or a full summary, apply a suggested social size, resize a local copy, or optimize file weight before downloading. Your original file is never stored or transmitted.

Why choose this free image size checker?

Browser-based — your files stay private

Traditional online checkers upload your image to a remote server. This image size checker uses the browser Canvas API in your tab — your photos are never transmitted to our servers, ideal for confidential or client work.

Dimensions and file size in one view

Image size can mean pixels, storage weight, format, or display ratio. The checker shows all four side by side so you know whether an image fits a CMS form, email attachment limit, or social upload requirement.

Social size comparison built in

Suggested size cards compare your image with YouTube thumbnail (1280×720), Open Graph (1200×630), square post (1080×1080), and vertical story (1080×1920) targets — with exact match, same ratio, or needs-resize status.

Resize and optimize without leaving the page

Enter target pixels or pick a preset, preview the output, and download a resized or optimized copy locally. No queue, and no watermark on exports from this image size checker.

Check image dimensions for every major platform

Instagram feed, Stories, and Reels

Use the image size checker to confirm 1:1 (1080×1080) for feed posts, 4:5 for taller mobile presence, and 9:16 for full-screen Reels and Stories. Reframe landscape photos so subjects stay centered in vertical frames.

YouTube thumbnails and banners

YouTube thumbnails work best at 16:9 (1280×720). Run your cover photo through the checker to confirm pixel dimensions and file weight before upload — heavy files slow page loads and may fail size limits.

Open Graph and link previews

Link shares on Facebook, LinkedIn, and Slack rely on 1200×630 Open Graph images. The checker compares your file against that target and shows whether you need to crop or resize for a clean preview card.

Websites, email, and marketplaces

Blog heroes, product listings, and email headers each have different pixel and file-size limits. Check dimensions and KB weight before publishing so images load fast and pass upload validators.

Understanding image size metrics

Pixel dimensions vs file size

Dimensions mean width and height in pixels (for example 1200 × 630). File size means storage weight in KB or MB. A high-resolution photo can have large dimensions but moderate file weight after compression — the image size checker shows both so you can judge fit accurately.

Aspect ratio and orientation

Aspect ratio is the proportional relationship between width and height, expressed as 16:9, 4:3, or 1:1. Orientation tells you whether an image is landscape, portrait, or square. Matching the target ratio prevents awkward cropping when you resize for different screens.

When to resize or compress

Resize when pixel dimensions do not match your target platform. Compress when file weight is too heavy for web or email but dimensions are already correct. This image size checker lets you do both locally after you read the numbers.

Supported image formats for size checking

JPEG / JPG — common for photos; file size varies with compression quality
PNG — lossless format; often larger file size but supports transparency
WebP — modern web format; typically smaller file size at similar quality
GIF, BMP, and HEIC — supported for dimension and file-size reading in most modern browsers

The image size checker reads dimensions from browser-supported formats without uploading files. For export, resize and optimize outputs are available as JPG, PNG, or WebP depending on your settings.

Image size checker — common questions

Is image size the same as image dimensions?+

Not exactly. Dimensions mean width and height in pixels; file size means storage weight in KB or MB. This image size checker shows both so you can tell whether an image fits a platform limit or needs compression.

Does DPI matter when I check image size for websites?+

Usually no. For web and social, pixel dimensions and file weight matter more than DPI metadata. The image size checker focuses on the numbers that affect upload limits, page speed, and display quality on screens.

Can this image size checker compare my photo with social media sizes?+

Yes. Suggested size cards compare your image with YouTube thumbnail, Open Graph, square post, and vertical story targets. Each card shows exact match, same ratio, or needs-resize status so you know what to change.

Is this image size checker private?+

Yes. Checking, resizing, and optimizing run in your browser. Images are not uploaded just to read dimensions — nothing is sent to our servers during a size check.

Can I resize and download from the image size checker?+

Yes. Enter target pixels or use a suggested size, preview the output, and download locally without replacing the original. You can also export an optimized WebP or JPG copy at a lower file weight.

What image formats does the size checker support?+

Most browser-supported formats including JPG, PNG, WebP, GIF, BMP, and HEIC from iPhone. Upload any supported file to see pixel dimensions, file size, format, aspect ratio, megapixels, and orientation instantly.

Free Image Size Checker:

Free Image Size Checker:

The fastest way to check image size online

How to use this image size checker in 3 steps

Add an image

Read the metrics

Act on the result

Why choose this free image size checker?

Browser-based — your files stay private

Dimensions and file size in one view

Social size comparison built in

Resize and optimize without leaving the page

Check image dimensions for every major platform

Instagram feed, Stories, and Reels

YouTube thumbnails and banners

Open Graph and link previews

Websites, email, and marketplaces

Understanding image size metrics

Pixel dimensions vs file size

Aspect ratio and orientation

When to resize or compress

Supported image formats for size checking

Image size checker — common questions

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