Image to 100 KB and the size on the form
100 KB is a frequent cap for ID photos, profile pictures, and job-portal uploads.
The picture is recompressed to a JPG near 100 KB in the browser.
If it is still too big
You get more room than a 20 KB or 50 KB cap, so the face stays clearer. Still crop first if the form names a pixel size.
Pixel rules and kilobyte rules are different. Resize first when the portal asks for both.
Why Image to 100 KB is its own job
Image to 100 KB sits on this site because Image and 100KB are not interchangeable, even when they look similar in a file list. 100 KB is a frequent cap for ID photos, profile pictures, and job-portal uploads. Resize, crop, rotate, compress, or change a photo when the next form has rules. Job portals and ID forms that allow 100 KB give the face more room than a 20 KB cap.
The picture is recompressed to a JPG near 100 KB in the browser.
The Image file you already have
Image tools redraw the picture in your browser. They do not upload the file. These tools do not recover detail the camera never captured. Upscale and HD modes enlarge pixels. They are not AI reconstruction.
Keep the original photo.
What a 100KB result is for
The download has to be 100KB, because that is the format the next step named. Job portals and ID forms that allow 100 KB give the face more room than a 20 KB cap. The JPG stays clearer than the 20 KB and 50 KB results.
Crop to the pixel rule first if the form publishes one.
How to tell that Image to 100 KB worked
Image to 100 KB is worth using only when 100KB is what the next step actually named. 100 KB is a frequent cap for ID photos, profile pictures, and job-portal uploads. What you get from Image to 100 KB: The picture is recompressed to a JPG near 100 KB in the browser. Before you trust it: You get more room than a 20 KB or 50 KB cap, so the face stays clearer. Still crop first if the form names a pixel size. The file stays in your browser and is not uploaded. The limit is 100 MB. Keep the original until the download has been opened in the program that will use it. A second pass rarely helps. If the first 100KB file is rejected, read the error from the program that rejected it. Another conversion of a bad result usually makes the file worse, not more compatible. When you are done, you should still have the Image original and one 100KB download that you have opened. If those two are the same kind of failure, this was the wrong tool and the page above is the place that says so. Photos fail uploads for three separate reasons: the format name, the pixel size, and the kilobyte size. Image to 100 KB only does the Image to 100KB step. If the form also prints a pixel size or a 20 KB or 50 KB cap, do that step with the matching tool, starting from the original each time. A second lossy save will not recover detail.
Here is the decision for Image to 100 KB. You start with Image and you stop when a real program accepts 100KB. The original pixels are what you have to work with. The edit is local. It still will not pass a form that says 50 KB. Match the number printed on the form. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
You get more room than a 20 KB or 50 KB cap, so the face stays clearer. Still crop first if the form names a pixel size.
A related step, if you still need one, is Image Compressor.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.