Image Size Checker
Instantly check the full technical specification of any image file — pixel dimensions (width × height), file size in KB/MB, file format, DPI/PPI setting, colour mode (RGB/CMYK/Grayscale), bit depth, and aspect ratio. Useful for verifying images before uploading to platforms with specific requirements, checking print readiness, or diagnosing why an image looks wrong. No files are uploaded — all information is read locally in your browser.
How to Use Image Size Checker
- 1
Upload your image
Click the upload area or drag and drop any image file — JPG, PNG, WebP, GIF, TIFF, or HEIC. You can also drop multiple images to compare their specifications side by side.
- 2
View all specifications
All technical details are displayed immediately: pixel dimensions, file size, format, DPI, colour mode, bit depth, aspect ratio, and megapixel count.
- 3
Check platform requirements
Compare the image specifications against the common platform requirements shown below the results. Green indicators show where the image meets requirements; red shows where it falls short.
- 4
Take action
If the image does not meet requirements, use the recommended tools to resize, compress, or convert it. Buttons link directly to the relevant tool with context pre-filled where possible.
When to Use This Tool
Quick Reference
About Image Size Checker
The Image Size Checker instantly displays the file size, pixel dimensions, DPI/PPI resolution, color mode, and format of any image you upload. This is the quickest way to verify an image meets specific requirements before submission — whether you're checking that a photo meets a job application's file size limit, verifying that a print image has sufficient DPI, or confirming dimensions before uploading to a specific platform.
Checking image size and properties is useful for:
- Verifying that a photo meets the file size limit for an online form or application portal
- Confirming that a print image has at least 300 DPI before sending to a printer
- Checking that an image meets the minimum pixel dimensions for a platform (e.g., 1000×1000 for Amazon product images)
- Identifying image format to determine compatibility with a target system
- Auditing a batch of website images to find oversized files that slow page loading
Image analysis reads the binary file header to extract format-specific metadata without fully decoding the image. File size is the actual disk size in bytes, kilobytes, and megabytes. Pixel dimensions are read from the image header (JPEG SOF segment, PNG IHDR chunk, or equivalent). DPI is read from the EXIF pHYs/density metadata. Color mode (RGB, CMYK, grayscale, indexed) is read from the format header. All of this information is extracted in milliseconds from just the first few hundred bytes of the file.
Input formats: JPG, PNG, WebP, GIF, BMP, TIFF, SVG, HEIC. Reported properties: file name, file size (bytes/KB/MB), width×height (pixels), DPI/PPI (horizontal and vertical), color mode, bit depth, format/compression type. Print size calculator: shows the physical print size at 72, 96, 150, and 300 DPI based on the pixel dimensions. No download is required — the information is displayed immediately after upload.
Analysis is entirely browser-based — your image is read from local storage and not transmitted to any server. Multiple images can be checked in sequence in the same session. For fixing size issues, use the Image Resizer for dimension changes or the Image Compressor for file size reduction.
Pro Tips for Image Size Checker
Use the print size calculator to quickly check if an image is high enough resolution for a specific print size — a 3000×2000px image prints at 10×6.67 inches at 300 DPI.
If you're auditing website images, check file size and look for anything over 500KB — these are candidates for compression or resizing that will improve page load speed.
Color mode matters for print: CMYK is required for offset printing, RGB for digital displays. If your image is RGB and needs to go to a print shop, they will convert it — but the colors may shift.
For social media uploads, check that your image meets the minimum but not the maximum — platforms compress oversized images, so uploading at the exact recommended size gives you the best quality control.
Frequently Asked Questions
Related Image Tools
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