Image File Size Checker
Upload an image to audit file weight, pixel count, bytes per pixel, estimated monthly transfer, and a practical target size for web optimization.
Optimization guidance
The checker will estimate monthly transfer weight and suggest a practical compression target.
Audit image weight before publishing
File size plus pixel count
Understand whether an image is large because of dimensions, format, compression settings, or unnecessary data.
Bytes per pixel estimate
Compare file weight against image area to spot heavy photos, screenshots, and graphics that may need optimization.
Bandwidth planning
Estimate monthly transfer for repeated page views and choose a sensible compression target.
Image file-size checklist
| Signal | What it means | Next action |
|---|---|---|
| Large dimensions | Too many pixels for the display area | Resize before compressing. |
| High bytes per pixel | Format or quality setting may be inefficient | Try WebP, AVIF, or tuned JPG quality. |
| Repeated page image | Bandwidth cost grows with views | Create responsive sizes and cache-friendly files. |
| Sharp text screenshot | Lossy compression can blur UI text | Use PNG or high-quality WebP carefully. |
Hvordan det virker
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1
Upload billede
Choose the image you want to audit before publishing.
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2
Check transfer impact
Enter expected monthly views to estimate bandwidth weight.
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3
Copy audit
Save the optimization note for your page-speed or content workflow.
How to reduce image file size without ruining quality
Start by resizing the image to the largest real display size. Then remove unnecessary metadata, choose a modern format, and adjust quality gradually while inspecting important details. Photos usually tolerate lossy WebP, AVIF, or JPG compression better than screenshots with small text. Logos and simple graphics often work better as SVG or PNG.
For SEO, image file size matters because heavy media can delay page rendering, increase bandwidth, and hurt user experience on mobile connections. Use responsive images, lazy loading for offscreen media, descriptive filenames, and meaningful alt text alongside compression.
Ofte stillede spørgsmål
What is a good image file size for web pages?
There is no single number, but many content images should be far below 500 KB after resizing and compression. Critical thumbnails can often be much smaller.
Why is my image file so large?
Common reasons include oversized pixel dimensions, high quality settings, inefficient formats, metadata, or detailed photographic content.
Does reducing file size always reduce quality?
No. Resizing oversized dimensions, removing metadata, and choosing a better format can reduce size without obvious visual loss.
Er mit billede uploadet?
No. The file is inspected locally in your browser.
Image File Size Checker last reviewed: Jul 22, 2026.