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Increase Image Size in KB

Increase image file size to meet minimum upload requirements

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How do I increase an image's file size in KB?

Open your image in Increase Image Size, pick a target such as 50 KB, 200 KB or 1 MB (or type any size from 1 to 50,000 KB), and download. A JPG is padded with invisible comment data and stays a JPG with the same pixels; other images are saved as PNG. It runs in your browser, so nothing is uploaded.

  • Targets from 50 KB to 10 MB, or any custom size in KB
  • JPG stays JPG, with the pixels untouched
  • Up to 20 images at once, downloaded as a ZIP
  • 100% client-side

What is

Increase Image Size in KB

A tool that makes an image file bigger in KB, to meet an upload form's minimum size, by adding invisible padding, imperceptible noise or larger dimensions, in the browser.

Image Tools

Related terms

file sizeupload minimumKB

Frequently Asked Questions

Not with the default method.

Smart and Metadata Padding add invisible data and leave every pixel as it was. Noise Injection changes pixels very slightly, and Upscale makes the picture larger in width and height.

It stays a valid JPG.

A JPG keeps its format and its width and height; only its size in KB changes. If the portal also asks for exact pixel dimensions, resize the photo first, then increase the KB.

Nothing to do.

A JPG that is already at or above the target comes back unchanged. Check the portal's maximum size too: many forms set both a minimum and a maximum.

No.

Everything runs locally in your browser.

Detailed Explanation

How It Works

What Increase Image Size does

Increase Image Size makes an image file bigger in KB so it meets an upload form's minimum size. Choose a target from 50 KB to 10 MB, or type any size from 1 to 50,000 KB.

  • Targets 50 KB–10 MB or custom
  • Up to 20 images per batch
Technical Details

How it works

For a JPG, the default Smart method inserts invisible JPEG comment segments, so the file reaches the target size and stays a JPG with the same pixels. Other images are saved as PNG with invisible text chunks, and are upscaled only when the target is very large. Noise Injection and Upscale are available when you want them.

  • JPG stays JPG
  • Pixels untouched by default
Use Cases

Use cases

Exam, job and government application forms that reject photos or signatures below a minimum size, such as 'at least 20 KB'.

  • Upload minimums
Limitations

Limitations

PNG, WebP and HEIC images are saved as PNG. Noise Injection changes pixels slightly and Upscale changes the dimensions, so use them only when the form allows it.

  • Non-JPG input becomes PNG
Privacy & Security

Privacy

The image is processed entirely in your browser; nothing is uploaded to a server.

  • 100% local
  • No upload