Check Image Size
View the exact file properties, then preview a measured output size with different dimensions, formats, and quality settings.
Image Size Checker & Output Size Preview
Use this free image size checker to view every property of your image — dimensions, file size, format, aspect ratio, megapixels, orientation, DPI, transparency, and EXIF data. Then use the What-If Simulator to adjust width, format, or quality and see the measured output size before you resize or convert. Everything runs in your browser — no upload required.
How to Check and Preview Image Size Online
Upload an image
Drop a JPG, PNG, WebP, HEIC, GIF, BMP, or AVIF image to start the analysis. Everything runs in your browser.
See the full analysis
Review dimensions, file size, format, aspect ratio, megapixels, orientation, DPI, transparency, and EXIF data instantly.
Try what-if settings
Change the width, height, format, or quality and run a measured trial encode — see exactly how many KB the output will be before you commit.
Take the next step
Use the smart recommendations to resize, compress, or convert your image using the tool that fits your goal.
Why Use This Image Size Checker?
Full image report
See every property of your image — file size, pixel dimensions, format, aspect ratio, megapixels, orientation, transparency, DPI, EXIF presence, colour space, and more.
Measured output preview
Change width, height, format, or quality and run a real browser trial encode. See the actual measured output size, not a guess.
What-If simulator
Tweak settings freely before resizing or converting. The interactive controls let you explore different outputs without touching the original.
Private browser analysis
Image decoding, EXIF extraction, canvas rendering, and trial encoding all happen locally. Nothing is uploaded to a server.
Analyse Every Property of Your Image Instantly
Use the image size checker to get a complete picture of your file — its exact size in bytes, KB, and MB, its pixel dimensions, its format and MIME type, its aspect ratio, megapixel count, orientation (landscape, portrait, or square), transparency status, embedded DPI value, and EXIF metadata presence. This one-page report replaces the need to open a file manager, photo editor, or multiple separate tools just to understand what you are working with.
This workflow covers the main image size checker, image dimensions checker, image file size analyser, and image properties viewer intent without hiding results behind a sign-up or upload wall. The analysis displays instantly after you drop or select your file.
Preview Measured Output Size Before You Commit
Unlike basic checkers that only show you the current image properties, this tool includes a What-If Simulator. Change the target width and height (with aspect ratio lock), switch between JPG, PNG, and WebP output, and adjust quality from 1 to 100. Then click Preview & Measure Output to run a real browser trial encode — not an estimate, but the actual measured file size using your chosen settings.
The result shows the measured output size, pixel dimensions, format, and the percentage saved or increased compared to the original. This helps you make an informed decision before using the Photo Resizer in KB, Image Compressor, or Resize Image Dimensions tool.
Know Your Next Step From the Analysis
After the analysis runs, the tool highlights what matters for your upload goal. If the file is large, it suggests compression. If the dimensions are high, it suggests resizing. If transparency is detected, it recommends preserving it with PNG output. If EXIF data is present, it flags a privacy consideration.
Each recommendation includes a direct link to the related tool —Image Compressor, Resize Dimensions, Resize by Percentage, Image to JPG, Image to PNG, Image to WebP, or DPI Converter — so you can fix what the checker found in one click.
Check JPG, PNG, WebP, HEIC Photos, and More
JPG is a practical format for ordinary photographs. PNG preserves transparency and works well for graphics, logos, and screenshots. WebP provides modern compression for the web. HEIC and HEIF photos from iPhones are decoded and analysed locally. GIF animations and BMP files are also supported.
The tool reads the actual format from the file's MIME type and displays it alongside the file extension. The What-If Simulator lets you try different output formats on the same image and compare the measured results side by side.
Check Image Size Without Uploading It
Your image is decoded, analysed, previewed, and trial-encoded in the browser during normal use. It is not sent to our server. This local workflow is useful when you need to check personal photos, identity documents, form images, or work files without transmitting them over the network.
Tested for accurate image analysis
We test each analysis metric against known sample files: JPG, PNG, WebP, HEIC, GIF, BMP, and AVIF formats, files from 1 byte to 50 MB, images with and without EXIF/DPI metadata, transparent and opaque images, landscape, portrait, and square orientations, animated GIFs, and mobile uploads on various browsers. Built and tested by Mozammel Hoshen Chowdhury. Review process: Editorial Policy.
Frequently Asked Questions
How do I check the size of an image online?
Upload or drop your image onto the checker. The tool instantly shows the file size in bytes/KB/MB, pixel dimensions, format, aspect ratio, megapixels, orientation, DPI (when available), transparency status, and EXIF metadata presence.
What image formats does this checker support?
The tool accepts JPG, PNG, WebP, HEIC, HEIF, GIF, BMP, and AVIF files. There is no server upload — everything runs locally in your browser for privacy.
Can I preview the output size before resizing?
Yes. Use the What-If Simulator to change width, height, output format, and quality, then click Preview & Measure Output. The tool runs a real browser trial encode and shows you the measured file size before you commit to any action.
Does this tool show DPI information?
Yes. When the image has embedded DPI or PPI metadata, the tool reads and displays it using the EXIF data. If no DPI is embedded, the tool reports Not embedded rather than showing a misleading value.
Can I check an iPhone HEIC image?
Yes. The tool decodes HEIC and HEIF photos from iPhones before analysing them. The analysis shows the original iPhone photo properties and lets you preview the output in JPG, PNG, or WebP.
Is there a difference between checking image dimensions and file size?
Yes. Dimensions (width × height in pixels) determine how large the image appears on screen. File size (KB or MB) determines storage and upload bandwidth. This tool shows both, and the What-If Simulator shows how changing dimensions or format affects the measured output file size.
Why should I check my image before uploading it?
Many forms, job portals, visa applications, and social media platforms have strict limits on file size, dimensions, format, and aspect ratio. Checking these properties first helps you avoid rejection and prepare the right version of your image.
Are my images uploaded to a server?
No. Image decoding, EXIF extraction, analysis, preview rendering, and trial encoding all run locally in your browser. Your files never leave your device.