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Increase Image Size in KB
Type the KB your form requires and get a file of exactly that size, picture unchanged.
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.
✅ Done! Your images are ready
About this tool
When a form says 'minimum 50KB' and your file is only 12KB, the upload fails. This tool adds invisible padding so the file reaches exactly the size you type. Your picture stays the same.
How to use the image size increaser in KB tool
- 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 50 and Increase is selected. Change the number if needed.
- Press the green button and download a file that is exactly 50 KB.
Increase mode keeps your picture and adds invisible padding so the file size matches exactly.
Where this helps
Minimum-size errors
Fix 'file too small' messages on forms.
Exact-size requests
Get exactly 30KB, 100KB, 1MB or any size.
Light scans
Plain scans are often very small.
Testing uploads
Create files of a known size for upload tests.
What to expect
The result is a valid JPG that opens everywhere. It will not look sharper, because only size changes. For better quality, take a higher-resolution photo.
Frequently asked questions
Is increasing file size the same as improving quality?
No. Padding adds size, not detail.
Can I increase and set exact pixels together?
Yes. Open Advanced options, type width and height, and the file is resized and then padded to the KB you typed.
Will the form detect padding?
The file is an ordinary JPG. Forms check type, size and sometimes dimensions, all of which are valid.
Is my photo uploaded anywhere?
No. Everything happens inside your browser, so your picture never leaves your device. No signup, no watermark.
Other sizes and tools
Compress image to a smaller size
Increase image size to a larger size
Signature, passport photo, formats and more
Prefer a percentage instead of a KB size? Use the quality-based image compressor, or read our image guides.