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Increase Image Size to 300KB

Type 300 and download a JPG of exactly 300KB.

📁 Step 1 – Select Images (JPG, PNG, WebP, HEIC)

Step 2 – What do you want?

Compress (make smaller)Increase (make bigger)

Type the size in KB:

Advanced (optional): exact pixels or minimum KB

Many forms ask for pixels as well as KB. Leave empty if yours does not. Examples are common sizes only – always use the size your form states.

Width (px)×Height (px)

When the shape differs:Minimum KB (for ranges like 10–20 KB, Compress mode):

✅ Done! Your images are ready

About the 300KB image

Some platforms expect images of at least 300KB to rule out thumbnails and screenshots. This page pads a lighter file up to exactly 300KB.

How to increase an image to exactly 300KB

Select your image. A JPG keeps its original pixels; other formats are converted to JPG first.
Check the size. The box is already set to 300 and Increase is selected. Change the number if needed.
Press the green button and download a file that is exactly 300 KB.

Increase mode keeps your picture and adds invisible padding so the file size matches exactly.

Where you need a 300KB image

Minimum-quality rules

Photo submissions that must not be thumbnails.

Contest or listing entries

Entries with a minimum file size requirement.

Light product shots

Plain white-background photos produce small files.

Archive uploads

Systems that check size to detect empty files.

What to expect at 300KB

The look of your image stays the same. Real sharpness only improves if you start from a higher-resolution source.

300KB image FAQ

Is padding a trick that could be detected?

The file is a valid JPG with standard comment segments. A site that checks pixel dimensions or content will still see your real image.

What is the largest size I can pad to?

Up to 20,480 KB (20MB) in the box.

Does it work offline?

The resizing itself runs locally in your browser. Only two optional helpers (HEIC conversion and ZIP download) are fetched from a CDN when needed, so keep the page open with a connection.

Is my photo uploaded when I increase it to 300 KB?

No. Everything happens inside your browser, so your picture never leaves your device. No signup, no watermark.

Other sizes and tools

Need the opposite? Try Compress image to 300KB.

Prefer a percentage instead of a KB size? Use the quality-based image compressor, or read our image guides.