Reduce Image Size in KB

Find the size limit in the form or portal you are filling in, then enter it here. The tool does the searching for you.

1. Drop your photo onto the box, paste it, or click to choose it. Several pictures can be done together, and all of them get the same target.
2. Type the limit in Target size in KB. The starting value is 100, and the box accepts 5 to 20,000.
3. Choose Output format: JPEG, the choice meant for hitting a size, or WebP if the destination accepts it.
4. Ignore Quality while a target is set. The slider is shown, but the tool picks the quality itself.
5. Press Reduce size, read the note under each thumbnail, and download the result.

The tool does not guess. It tries several quality levels, from very low to high, and keeps the highest one whose file still fits under your target. A picture that fits easily is saved at a high quality, up to about 95 percent.

Sometimes even the lowest quality is too big. Then the tool shrinks the picture step by step, each step taking the width and height down to about 85 percent of the last, and tries again. After three steps the picture is about 61 percent of its original width, and the note will tell you it was scaled. If no step is enough, you receive the smallest result it could make, with a message that the target was not reached.

PNG input is converted to JPEG when a target is set, and transparent areas become white whichever format you pick. The size in the note is counted in units of 1,024 bytes, as shown below.

The result lands at or under the target, not exactly on it, and it can finish a little below. The page does not pad files to hit a number.

Limits vary from one portal to another, and the tool cannot know them, so read the instructions on the form and do not assume this page satisfies them. Three practical tips follow.

• Leave some margin. Some systems count 1 KB as 1,000 bytes rather than 1,024. A file of 102,000 bytes meets a 100 KB target here but could fail a limit of 100,000 bytes. Aim for 90 or 95 when the limit is hard.
• Check the pixel rules. Many forms also ask for a width and height, for example for a photo or a signature. This tool does not set exact pixel dimensions. Use the image resizer for that, then come back to hit the size.
• Crop first. Remove empty space with the image cropper, so the bytes go to the face or the handwriting rather than the wall behind it.

Pictures that are already under the target are left exactly as they are, and the note says so, so you can drop in a mixed batch without making any file bigger.

If you want to control the quality by hand instead of the target, use Compress JPG. The image compressor is the parent tool, and the KB to MB converter helps when a limit is given in megabytes. File size units are the same in every form, though portals differ in how they count them.

How much picture fits in a number of kilobytes depends on the content, so treat this table as a rough guide rather than a promise.

Busy pictures with fine texture need more bytes than plain ones, so a photo of foliage may be scaled down where a photo against a plain wall is not. If the note says the picture was scaled, the number of pixels fell, and text in a photographed document may become harder to read. In that case ask whether the portal allows a larger size.