ImageSplitImage Size Checker
Read the pixels and file size of your photo, then see how large it could print at your chosen DPI. Choose one JPEG, PNG or WebP to get started.
100% private — processing happens entirely in your browser.
Choose an image or drop it here
JPEG, PNG or WebP · Up to 50 MiB and 40 MP
Your results will appear beside the image.
Check pixels before cutting tiles, file size before compressing, and print dimensions before making a poster.
The original stays on your device. This tool reads it without resizing, compressing or saving a new image.
Image details
- Dimensions
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- File size
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- Exact bytes
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- Aspect ratio
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- Megapixels
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- Format
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Estimated print size
— cm
— inches
Calculated from pixels at your chosen DPI. This does not read embedded DPI metadata, add detail or guarantee print sharpness.
One photo, three different measurements
Example: 960 × 640 pixels
- Shape
- 3:2 · 0.61 megapixels
- At 150 DPI
- 6.4 × 4.27 inches · 16.26 × 10.84 cm
- At 300 DPI
- 3.2 × 2.13 inches · 8.13 × 5.42 cm
The pixels stay the same when you change DPI here. Only the calculated print size changes. This small illustration is useful for checking the workflow; it is not a high-resolution poster source.
What does image size mean?
Pixel dimensions are the width and height of the image grid. A 2400 × 3000 image has more pixels than a 960 × 640 image, regardless of how large either preview looks on your screen. When a form asks for a minimum width, use the pixel number rather than the preview size.
File size measures storage. The checker shows exact bytes and binary units: 1 KiB is 1,024 bytes and 1 MiB is 1,048,576 bytes. A website may call these KB and MB or use decimal units instead. Compare exact bytes when a destination has a strict limit. Compression can change the byte count without changing the dimensions.
Print dimensions connect pixels to a physical area. Divide pixels by the chosen DPI to estimate inches, then multiply by 2.54 for centimetres. The same pixels cover a smaller area at 300 DPI than at 150 DPI. This calculation does not measure whether a source is sharp, read its embedded DPI or change the original file.
Check image dimensions before your next step
1. Choose the original
Drop one JPEG, PNG or WebP into the workspace. Use the source file rather than a screenshot of it. The checker reads the file locally and waits for the browser to open it before showing results.
2. Read pixels and bytes
Compare width, height and file size with the requirement you need to meet. Aspect ratio describes shape; megapixels describe the total pixel count. Neither tells you the file weight by itself.
3. Estimate or copy
Choose a DPI to estimate a physical print size. Copy the result into your own notes or brief. A copied summary contains measurements, not the image or its filename.
Limits to keep in mind
This first version reads one JPEG, PNG or WebP up to 50 MiB, 40 megapixels and 16,384 pixels per side. The browser must be able to decode it. A damaged file, an unsupported format or a very large image can fail even when the filename looks familiar. An image that passes this checker may still exceed another tool’s processing limits; the splitter and PDF tools currently allow up to 24 megapixels.
The displayed dimensions follow the orientation your browser applies. A rotated phone JPEG can therefore show portrait dimensions even when its encoded grid is landscape. The checker does not edit metadata, convert formats, resize pixels or improve detail. For a large poster, start with the sharpest original available and test one physical sheet before printing the whole file.
Image size checker questions
How do I check the dimensions of an image?
Choose a local JPEG, PNG or WebP, or drop it into the tool. The results show its width and height in pixels, aspect ratio, megapixels and encoded file size. Copy results saves a text summary to your clipboard.
What is the difference between pixels and file size?
Pixels describe the image grid. Bytes describe the encoded file on disk. Two photos can have the same pixel dimensions and very different file sizes because their content, compression and metadata differ.
Does this check embedded DPI?
No. The print estimate divides the pixel dimensions by the DPI you enter. It does not read or change an embedded DPI tag. Increasing the entered DPI makes the calculated print smaller; it does not add detail.
How big can I print my photo?
Choose a DPI and read the estimated size in centimetres and inches. For example, 2400 × 3000 pixels at 300 DPI corresponds to 8 × 10 inches. Source sharpness, viewing distance, paper and the printer also affect the result.
Which image formats and sizes can I check?
One JPEG, PNG or WebP at a time, up to 50 MiB, 40 megapixels and 16,384 pixels per side. HEIC, GIF, BMP, AVIF, SVG, TIFF and PDF are not supported by this checker. Export a JPEG or PNG copy first.
Will my image be resized or uploaded?
No. The original file is read locally and displayed without creating a rewritten image. Copy results copies text only. ImageSplit does not send your image to an upload or conversion service.
Why can the dimensions differ from a raw file header?
The displayed dimensions follow the orientation applied by your browser. A JPEG with a rotation instruction can display as portrait even when its stored pixel grid is landscape.
Can I make a poster after checking the image?
Yes. Open Split to PDF to create a poster across A4 or Letter sheets. Select the image again in that tool; this checker does not transfer files between pages. The PDF tool has its own processing limits.