Quick answer: Open Compress Photo, select your picture, choose 100 KB, and tap Compress Image. Check the resulting size and dimensions, then tap Save Image.
Before you start
Check the upload requirements of the form or website you are using. A maximum file size and an exact pixel size are separate requirements. Also check whether it accepts JPG or PNG. Keep your original image so you can start again if small text becomes difficult to read.
For a file stored in a cloud photo service, make sure it is available on your phone before processing offline.
Compress the image in five steps
- Open Compress Photo. This is the main action on the home screen.
- Tap Select Image. Choose the photo using the Android picker. Crop away unused borders if they are not required in the final image.
- Choose 100 KB. You can also enter a custom target. Open More options if you need to control additional output settings.
- Tap Compress Image. Wait for the Result screen. Read both the output file size and the pixel dimensions.
- Save and check the file. Tap Save Image, open the exported copy and make sure faces, text or other important detail remain clear enough for your intended use.
What does a 100 KB target mean?
The app treats the target as a size limit. It does not pad an image with unnecessary data to reach exactly 100 KB. In our demonstration, the 796.8 KB sample became a 99.5 KB JPG, with dimensions changing from 1448 × 1086 to 1303 × 977. This is one measured example, not a promised compression ratio.
The app uses 1 KB = 1024 bytes. If a form applies a strict 100,000-byte limit, choose a slightly lower target, such as 95 KB, and check that the file is accepted.
When the file size and dimensions conflict
Very small file limits may be incompatible with a large, fixed image size. Do not assume that a successful reduction means every form requirement is met. For a request that locks pixel dimensions, the app reports a missed target rather than silently reducing those dimensions to claim success.
If the output is still too large, consider a smaller crop, smaller permitted dimensions or JPG for an ordinary photograph. JPG does not preserve transparent backgrounds: keep PNG for an extracted signature that needs transparency.
After saving
Upload the exported copy, not the original photo. Keep the original separately. Normal manual compression does not require a rewarded ad, although the app contains banner and interstitial advertising. For multiple files, a free batch handles up to five images; an available rewarded ad can expand that batch to thirty.