TSUBAMI / PRACTICAL GUIDE
How to make an image fit a 100 KB or 200 KB limit
Fit a file-size requirement while keeping an eye on dimensions and readability.
Updated October 24, 2026 · Tsubami
Check the two limits separately
A form can require both a file size, such as 100 KB, and dimensions, such as 600 × 600 pixels. File size measures stored bytes; dimensions measure the width and height of the image. A picture can satisfy one requirement and fail the other. Read the destination’s accepted formats as well.
Crop before you compress
If the image includes unwanted borders or background, crop those away first. Then use Resize image if the destination specifies dimensions. Fit mode keeps proportions; Exact pixels can stretch an image, so a crop with the right framing is often the better starting point.
Set a maximum size in KB
Open Compress image, choose a target such as 100 or 200 KB, and select JPEG or WebP. In this tool, one KB is 1,000 bytes. Compression first adjusts quality; if necessary, it also reduces dimensions. The result can be below the target rather than exactly equal to it.
Inspect the actual copy
The result shows its actual size and dimensions. Open the preview and check faces, small lettering and edges at full size. If the tool cannot meet the target, it says so. Try a larger allowed size or a tighter crop; never assume that changing a filename or format alone reduces size enough.
Transparency and originals
JPEG fills transparent areas with white. Choose WebP when it suits the destination and transparency matters, or preserve a PNG original for later editing. Download the copy before leaving the tab. Your source file is not overwritten.
Tools for this job
These guides describe the current Tsubami tools and their limitations. Keep originals and inspect outputs before relying on them. See supported files and limits.