Compress a JPEG to 100 KB
Most phone photos are JPEGs of 2 to 5 MB. To compress a JPEG to 100 KB, the tool tries different quality levels and picture sizes and keeps the best-looking version that stays under the limit. The result is a new JPEG with hidden details such as location removed. If your file is already under 100 KB, you get it back as it is, only with those hidden details removed.
What 100 KB holds
100 KB is enough for a sharp photo on a phone screen or in a document. This is what our sample photos became:
| Photo | Result at 100 KB |
|---|---|
| iPhone, landscape | 985×738 px, 84.2 KB |
| iPhone, portrait, detailed | 548×730 px, 87.4 KB |
| 1920×1440 photo | 730×548 px, 85.3 KB |
Detailed photos (trees, crowds, printed text) need more bytes for the same size; simple ones need fewer. If you need the original width and height, tick “Keep the original width and height” under Advanced options and the tool will lower the quality instead.
Screenshots and PNG files vs photos
Screenshots, charts and documents with large flat areas compress well, so they can keep a larger width and height within 100 KB than a photo can. Photos need more space, because almost every pixel is slightly different.
PNG files are a special case: PNG never throws detail away, so a photo saved as PNG cannot get much smaller without losing pixels. For photos, keep the output as JPG (the default). For a screenshot that must stay PNG, choose PNG under Advanced options; the tool will make it smaller in width and height if needed and tell you when JPG would do better.