Image Size Checker
Check an image’s width, height, file size, format, and aspect ratio before you upload it. Use it to confirm requirements for websites, forms, marketplaces, and CMS tools.
Upload your file
Use this free Image Size Checker and preview the result before downloading.
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An image size checker reads an image file and reports its pixel dimensions, file size, file type, and aspect ratio. Use it before uploading, resizing, compressing, or converting an image so you know what needs to be fixed.
What Is an Image Size Checker?
An image size checker is a tool that inspects an image file and shows basic technical details, usually including pixel width, pixel height, file size in KB or MB, image format, and aspect ratio. Image files such as JPG, PNG, WebP, and GIF store visual data in different ways, so their dimensions and file weight can vary a lot. People check image size before converting, resizing, compressing, or uploading because many platforms set strict limits for width, height, file type, and maximum file size.
How to Check Image Size
Upload the image
Choose a JPG, PNG, WebP, GIF, or other browser-supported image file from your device.
Read the dimensions
Check the reported width and height in pixels, such as 1200 × 800 or 1080 × 1350.
Review the file details
Look at the file size, format, and aspect ratio to see whether the image matches your upload requirements.
Decide the next edit
Resize, crop, compress, or convert the image only if the report shows a mismatch.
When to Use an Image Size Checker
- Check upload forms that require exact pixel dimensions or a maximum file size.
- Confirm compatibility before sending JPG, PNG, WebP, or GIF files to a client or platform.
- Verify CMS requirements for blog images, thumbnails, banners, and featured images.
- Inspect product photos before uploading to marketplaces such as Shopify, Etsy, or Amazon.
- Check ad creative dimensions before submitting assets to social or display ad platforms.
- Confirm aspect ratio before cropping for Instagram, YouTube thumbnails, or website hero images.
- Prepare a design handoff by reporting image width, height, format, and file weight to a designer or developer.
Image Size Checker vs Alternatives
| Tool | What it does | Best fit | Notes |
|---|---|---|---|
| Pict AI Image Size Checker | Shows image dimensions, file size, type, and aspect ratio in a browser-based report. | Quick checks before uploads, resizing, or compression. | Focused on basic image inspection rather than advanced metadata analysis. |
| Squoosh | Opens images, previews compression, and exports formats such as WebP and AVIF. | Comparing file size changes while optimizing images. | More useful when compression or conversion is part of the workflow. |
| ExifTool | Reads and writes detailed metadata from image, video, and document files. | Deep EXIF, IPTC, XMP, camera, GPS, and metadata inspection. | Command-line tool with more technical output. |
| ImageMagick Identify | Reports image format, geometry, colorspace, and other file properties. | Batch checking image specs in scripts or developer workflows. | Requires command-line use and local installation. |
All four tools can help inspect image files, but they serve different workflows: quick browser checks, compression testing, metadata analysis, or command-line batch processing.
Image Size Checker Limitations
- It reports existing image properties; it does not automatically resize, crop, compress, or convert the file.
- HEIC, AVIF, TIFF, and RAW support can vary by browser and device.
- File type detection may depend on browser decoding and may not catch every renamed or malformed file.
- Animated GIFs or animated WebP files may show container-level details rather than frame-by-frame specs.
- DPI or PPI metadata may be missing, inaccurate, or irrelevant for screen display because pixel dimensions control on-screen size.
- Transparency detection can vary by format and encoding; a PNG or WebP may need a dedicated alpha-channel check.
- Corrupted images, incomplete downloads, and unsupported encodings may fail to load or return limited details.
- Large files can take longer to open, especially on mobile devices with limited memory.
Related tools after Image Size Checker
Invert image colors for design, accessibility, or creative effects.
View basic image file details before uploading elsewhere.
Strip metadata by re-exporting the image through a browser canvas.
Remove common photo metadata by downloading a clean browser-rendered copy.
Frequently Asked Questions
It usually shows pixel width, pixel height, file size, image format, and aspect ratio. Some tools may also show limited metadata if the browser can read it.
Some browser-based tools can inspect files locally after you select them. This depends on how the tool is built and what details it needs to read.
Dimensions are the image’s width and height in pixels. File size is the storage weight of the file, usually shown in KB or MB.
Not always. File size also depends on format, compression level, color complexity, transparency, metadata, and whether the image is animated.
Yes, most modern browsers can read common formats such as JPG, PNG, WebP, and GIF. Support for HEIC, TIFF, AVIF, and RAW files varies.
Yes. Many platforms crop or reject images if the aspect ratio does not match their required shape, such as 1:1, 4:5, 16:9, or 3:2.
No. DPI or PPI affects print sizing metadata, while pixel dimensions define the actual width and height of the digital image.
It can show the file size so you can compare it with an upload limit or performance target. If the file is too large, use a compressor or export tool next.
It may show the detected format if the browser can decode the file. For deeper verification of mismatched or damaged files, use a metadata tool such as ExifTool.