Pixel dimensions: width × height
A 1200 × 630 px image is 1,200 pixels wide and 630 pixels tall. Dimensions help you check a layout or a minimum pixel requirement. They do not tell you the file size.
Measure. Check. Make it fit.
Image Size Checker
Check image dimensions in pixels and file size in KB or MB. Compare your upload requirements, then resize or compress a copy and check the result.
Free. No account. Images stay on your device.
Check an upload limit
KB and MB guide →
No file-size limit set. Choose the limit required by your destination.
Know your image before you send it.
Drop an image here, choose a file, or paste it from your clipboard.
Tip: press Ctrl+V or Cmd+V after copying an image
Original image · unchanged
Choose an image to get a copy-ready summary.
Pixel dimensions-
File Size-
Aspect Ratio-
Format-
Megapixels-
Orientation-
Check upload requirements
Enter the limits from your form, CMS, or design brief. Check the original here and the processed download below. Leave any optional rule blank to skip it.
Match the destination's units: 1 MB = 1,024 × 1,024 bytes or 1,000 × 1,000 bytes. Changing the unit keeps your entered number. File size readouts use 1,024; checks compare exact bytes using your chosen convention. A pass covers only your entered rules.
Original image checks
Add a rule to check your image.
Use the resize and optimize controls below. Download checks refresh automatically when the output is ready. Copy Summary and Download .txt include both sets of checks.
Size suggestions and image guidance
File weight
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Choose an image to see whether the file is light, moderate, or large for web use.
Next step
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Use the size comparison and resize tool to decide what to do next.
Suggested sizes
Apply common targetsChoose an image to compare common social sizes and apply one to resize.
02 / Resize and optimize your image
Resize and download image
Runs locally in your browserEnter target width and height, or use a ratio like 16:9 with one dimension. Crop to fit is the default for ratio changes; switch to No crop to resize the full image directly.
Size
Ratio
Fit mode
Crop area
Drag the frame to choose the crop area. Use the handles or the size slider to zoom the crop in or out.
Resized preview
Choose an image to resize it in this browser.
Choose an image to resize by pixels or ratio, preview the scaled output, and download the resized file.
Download checks
Generate a resized or optimized copy to check its dimensions, file size, and format.
Set upload requirements to check this download against the same rules as your original.
No output ready to check.
Optimize file size
Local compressionExport a WebP or JPG copy using the target dimensions on the left. Adjust quality and compare the generated file size before saving. Lower quality does not guarantee a particular KB limit.
Choose an image to optimize a local copy without replacing the original.
Ready for JPG, PNG, WebP, GIF, SVG, AVIF, BMP, and more.
Two measurements. Different jobs.
Image dimensions vs. file size
“What size is this image?” can mean how many pixels it contains or how much storage it uses. Check both before uploading a photo, product image, or design.
File size: bytes, KB and MB
File size is the amount of data in the image. Two images with the same dimensions can have very different sizes because of their format, detail, and compression. This image file size checker shows the exact bytes as well as KB and MB.
Aspect ratio, megapixels and DPI
Aspect ratio describes the shape. Megapixels count the pixels. Neither guarantees sharpness. DPI concerns print sizing; this tool reads pixel dimensions and does not inspect embedded DPI metadata.
The file size readout uses 1 KB = 1,024 bytes. Requirement checks also support 1 KB = 1,000 bytes. Choose the convention used by your destination; a rounded “200 KB” label alone is not an exact byte limit.
From a measurement to a decision
Check whether your image fits an upload limit
A file can have the correct pixel dimensions and still be too large. Enter the actual rules from your form, CMS, marketplace, or design brief.
01. Check the original
Choose an image and open Check upload requirements. Set exact or minimum dimensions, a maximum file size, or a format. Leave any rule you do not need blank.
02. Adjust a copy
Open Resize and optimize. Crop to fit a different shape, reduce pixel dimensions, or try WebP or JPG quality settings. Your original file stays unchanged.
03. Verify the download
Download checks compares the generated file against the same rules. Read the output result before saving. Copy Summary and Download .txt include separate original and download checks.
When an image is too large to upload
1200 × 630 px · PNG · 706 KB meets a 1200 × 630 requirement but exceeds a 500 KB limit.
A WebP copy could keep those dimensions and use fewer bytes. It passes only if its actual generated size is within the limit and WebP is an accepted format. The result depends on your image; compression does not guarantee a fixed file size.
Need a byte limit? Use the image file size checker for KB, MB and upload limits. Checking a website image? Follow the website image size guide to find the source file and compare its dimensions with its displayed size.
Common Image Sizes for Social Media
These are convenient resize presets, not a complete platform compliance check. Compare pixel dimensions and shape, then confirm the destination’s current format and file size requirements.
| Use Case | Common Size | Why It Matters | Your Image |
|---|---|---|---|
| YouTube thumbnail | 3840 x 2160 | YouTube’s recommended 16:9 video thumbnail size. Use JPG or PNG; uploads are limited to 2 MB on mobile or 50 MB on desktop. | Choose an image to compare. |
| Open Graph image | 1200 x 630 | A common sharing preset, not a universal Open Graph requirement. Each destination controls how the preview is displayed. | Choose an image to compare. |
| Instagram square photo | 1080 x 1080 | A square feed layout. Instagram supports photos up to 1080 px wide, with ratios from 1.91:1 to 3:4; square is one supported shape. | Choose an image to compare. |
| Instagram Stories ad | 1440 x 2560 | Meta’s recommended 9:16 image ad size. Use JPG or PNG up to 30 MB. Leave room around key text and logos for interface overlays. | Choose an image to compare. |
| Vertical story (9:16) | 1080 x 1920 | A full-height 9:16 layout for story artwork. Keep important text away from edges and check the preview in your publishing app. | Choose an image to compare. |
See the requirements for YouTube thumbnails, Instagram photos and Instagram Stories ads. The 1080 × 1920 vertical layout is a general preset; the ad preset follows Meta’s separate ad guidance. Open Graph does not define one universal image size. Enlarging a small image does not add detail.
A quick check, wherever you work
How to check image size
Choose a file, drag it into the checker, paste an image, or try the sample. Read Pixel dimensions for width and height, and File Size for bytes, KB and MB. Use the exported file you plan to send: screenshots and messaging apps may change it.
Read the step-by-step image size guide →
Includes desktop and phone options, an upload-limit example, and what to do when dimensions match but the file is still too large.
Image Size Checker FAQ
Answers about pixel dimensions, file size limits, supported formats, resizing, and keeping your images private.
Is image size the same as image dimensions?
Not always. Dimensions are the width and height in pixels, such as 1200 × 630. File size is the number of bytes stored, often shown in KB or MB. This checker measures both for photos and other supported images.
Can I check whether an image meets an upload limit?
Yes. Open Check upload requirements and enter exact or minimum dimensions, a maximum file size in KB or MB, or a required format. Choose the 1,000 or 1,024 byte unit convention used by your destination. Original image checks and Download checks report separate results. A pass covers only the rules you entered.
What image formats can I check?
JPG, PNG, WebP, GIF, SVG, AVIF and BMP can be checked when your browser can decode them. HEIC and other formats vary by browser. If a file cannot be read, export a supported copy first. That copy may have different measurements from the original.
Can I check multiple images or scan a website URL?
The checker checks one image at a time. It does not scan a website URL or process a batch. To check a website image, save the actual image file and choose it here. A screenshot measures the screenshot, not the original website image.
Can I try a sample and compare common sizes?
Yes. Try sample image creates a 1200 × 630 PNG locally. Size suggestions and image guidance compares your result with common presets. Use this size applies a preset to the resize controls. Presets are references, not a guarantee of platform compliance.
How do resizing, aspect ratios and cropping work?
Open Resize and optimize, then enter target width and height or a ratio such as 16:9. With one dimension and a ratio, the matching side is calculated. Crop to fit lets you move and resize a crop frame without stretching. No crop scales the full image directly and can stretch it when the target ratio differs. Download Resized Image saves a separate copy.
Can I compress an image to a specific KB or MB limit?
You can enter a file size limit, try WebP or JPG output, and adjust the quality slider. The default quality is 75%. Download checks reports whether the generated file meets your limit. Compression is manual; this tool does not automatically guarantee an exact target size. Smaller dimensions may help too. PNG output does not use the quality slider.
Does DPI tell me whether a photo is sharp?
No. DPI metadata alone does not establish image quality. For a web upload, check pixel dimensions and inspect the image visually. For printing, consider the intended physical size and pixel density. The checker does not read embedded DPI or camera metadata.
Will downloaded copies keep metadata and animation?
Browser-generated copies may lose EXIF, GPS or color profile information. Processing an animated image may keep only one frame, and vector images are rasterized. Keep your original if metadata, animation, transparency or exact color reproduction matters. JPG does not preserve transparency.
Are my images private, and can I export the results?
Image checks, resizing and optimization run in your browser without a server upload or an account. Copy Dimensions copies the pixel dimensions. Copy Summary and Download .txt include the original measurements and any generated file checks. Reports may include your filename, so review them before sharing.