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Free image tool

Resize Image to Target File Size

Compress your images to a precise file size like 20KB, 100KB, 500KB, or 1MB in seconds, right in your browser. Upload your image and pick a target size on the left, then preview and download the optimized file on the right.

Working field

Upload an image and choose a target size.

Upload image
Tip: The tool uses a binary search to get as close to your target size as possible without going over. Output is always JPEG for the smallest size.

Result

Your resized image appears here.

Upload an image on the left and pick a target size, then click Resize Image. Your preview and download button will show here.

This tool is best for meeting strict file size limits on forms, portals, and uploads.

Free Online Resize Image to Target File Size

Need to resize images to a specific file size like 20KB, 50KB, 100KB, or even 1MB? This tool quickly reduces your image file size to meet social media upload limits or official form requirements. If you have a large file and need to check the difference first, use our MB to KB Converter to get the exact values.

Whether you want to compress a large JPEG photo down to under 500KB or shrink images for email attachments, this tool adjusts the compression quality intelligently. Unlike simple dimension resizers, it focuses on file weight. If you want to hit a precise Kilobyte target for job applications or ID cards, our Photo Resizer by KB is the ideal companion. This tool keeps the workflow simple: upload on the left, supporting content below, and the sidebar on the left for popular and related tools.

Target size presets

Pick 20KB, 50KB, 100KB, 500KB, 1MB, or 2MB to match any upload limit.

Smart binary search

An automatic algorithm tunes JPEG quality until your image fits the target.

Live preview

See the resized image and its final KB size before you download.

Private by design

Everything runs in your browser, so your images never leave your device.

How it works

  1. Click the upload zone or drag and drop your image on the left.
  2. Pick your target size from the dropdown, such as 50KB or 100KB.
  3. Click Resize Image to compress it to that size right away.
  4. Check the resized preview and final KB size in the result panel.
  5. Click Download Resized Image to save the optimized file.

Best practices

  • Check the exact size limit before you start, like under 100KB.
  • Start with a higher-quality original for better-looking results.
  • Pick a larger target for photos with lots of fine detail.
  • Remember that PNG transparency becomes white in JPEG output.
  • Keep your original file in case you need to redo the resize.
  • Preview the result to confirm the quality before downloading.

Frequently asked questions

What image formats can I upload?

You can upload JPG, JPEG, and PNG images. The tool processes them and gives you a highly optimized JPEG output to reach your target size.

How accurate is the target file size?

The tool is highly accurate. It tries to get as close as possible to your selected size (like 100KB) without exceeding it, though complex images may vary by a few bytes.

Are my images stored on your server?

No. All compression happens locally in your browser using JavaScript. Your images never leave your device, so your privacy stays intact.

Can I convert MB to KB using this tool?

While the resizer shrinks the file, you can use our MB to KB Converter to understand the exact mathematical conversion of your file sizes.

Why did my PNG lose its transparency?

To reach small file sizes like 20KB, we use JPEG compression. JPEG does not support transparency, so any transparent areas are filled with white.

Does this tool work on mobile devices?

Yes. Our tool is fully responsive and works perfectly on Android, iOS, and tablets directly through the browser.

How many images can I resize at once?

The tool processes one image at a time to ensure maximum precision for your target file size.

What is the best size for a website hero image?

For large web images, we recommend a target of 500KB to 1MB to keep high quality while loading the page fast.

Can I resize a photo for a passport application?

Yes. Most passport portals require photos under 50KB or 100KB. Use the Photo Resizer by KB option for the best results.

Do I need to pay for this service?

No. This is a 100% free tool with no hidden costs, watermarks, or daily usage limits.

Common target sizes

  • Resize to 20KB: Ideal for small thumbnails and signature uploads.
  • Resize to 50KB: Standard for many online job and exam applications.
  • Resize to 100KB: Perfect for blog post images and social media profiles.
  • Resize to 500KB: Balanced quality for gallery photos and portfolios.
  • Resize to 1MB+: High-detail compression for professional presentations.

Need more image tools? Understand your file sizes with the MB to KB Converter tool, or hit a precise KB target with the Photo Resizer by KB tool.