How to Increase Image Size in KB: What PDFKaka Can and Cannot Do

Identify the real image requirement first

A minimum file size, minimum pixel dimensions, and a request for a clearer image are different requirements. Adding bytes does not restore image detail that is missing from the source.

PDFKaka's Target KB mode sets a maximum and reduces an image to stay at or below that limit. It is not a minimum-KB or exact-KB control.

1. Write down the accepted format, minimum or maximum KB, and required width and height.
2. Check whether the destination rejects a small file because of bytes, dimensions, or visible quality.
3. Return to the original image before making a new output.

Know the current Image Resizer limits

The tool accepts one JPG or PNG up to 25 MiB. Target KB accepts a maximum from 5 KB to 5,000 KB, and Width & height accepts dimensions up to 16,384 pixels per side and 40,000,000 total pixels.

Resized outputs are JPEG. PNG transparency is placed on white, and browser JPEG encoding can make the result smaller or larger than the source even when the pixel dimensions increase.

1. Use Target KB only when the destination gives a maximum file size.
2. Use Width & height when the destination gives pixel dimensions.
3. Use another workflow if the destination requires PNG transparency or a guaranteed minimum number of bytes.

Enlarge only for a required width and height

Select Width & height, keep Maintain aspect ratio enabled unless both dimensions are mandatory, and turn off 'Do not enlarge smaller images' before entering dimensions larger than the source.

Enlargement interpolates existing pixels. It can satisfy a dimension check, but it does not create new camera detail and does not guarantee that the output reaches a minimum KB value.

1. Select one original JPG or PNG and note its starting dimensions and size.
2. Open Width & height and enter the required pixel dimensions.
3. Turn off 'Do not enlarge smaller images' only when enlargement is required.
4. Resize, download the JPEG, and inspect it at full size.

Do not confuse maximum KB with minimum KB

Entering 100 KB in Target KB asks PDFKaka to produce a JPEG at or below 100 KB. It cannot be used to make a 40 KB image at least 100 KB or exactly 100 KB.

The Image Resizer does not expose a manual JPEG-quality control or add padding bytes. If a portal genuinely requires a minimum file size, confirm its accepted remedy instead of repeatedly re-encoding the image.

1. Do not enter a larger Target KB value expecting the output to grow.
2. Do not claim that a larger file contains more real detail.
3. Keep the original if the supported controls do not match the requirement.

Verify the downloaded image

Check the output outside the active workspace before submission. Compare dimensions, file size, format, aspect ratio, and the smallest important details with the stated requirement and the original image.

1. Confirm that the file is a JPEG accepted by the destination.
2. Check the exact pixel dimensions and byte size in file properties.
3. Inspect faces, document text, signatures, and sharp edges at full size.