Compress Image to
Exact KB
Reduce any JPG, PNG or WEBP photo to 20KB, 50KB, 100KB or any exact size. Fast, free and processed right in your browser.
- 100% Free
- No Installation
- Works on All Devices
- Fast & Secure
Compress Your Image
Upload an image, choose a target size in KB or MB and download the compressed file instantly.
Your images are compressed inside your browser and are never uploaded to a server.
Compress Image to Exact KB: What This Free Tool Does
Many websites ask for a photo or a scanned document that is smaller than 50 KB, or somewhere between 20 KB and 100 KB. A normal phone photo is several megabytes, so it is rejected straight away. Our Compress Image to Exact KB tool takes a JPG, PNG or WEBP file and shrinks it until it fits the size you choose, whether that is 20 KB, 50 KB, 100 KB, 200 KB or any custom value.
The tool works fully inside your browser. Your pictures are never uploaded to a server, so it is safe to use for passport photos, signatures, ID cards and other private files.
How to Compress an Image to 20KB, 50KB or 100KB
- Drop your image into the upload box, or click it to pick files from your phone or computer.
- Choose a target size with one of the quick buttons (20 KB, 50 KB, 100 KB and so on), or type your own number and pick KB or MB.
- Select the output format. JPG is the safest choice for photos, and WEBP gives smaller files at the same quality.
- Wait a moment while the tool finds the best quality that stays under your limit, then press Download.
You can add several images at once and use Download All to save them in one go.
Why Exact File Size Matters
Online forms are strict about uploads. Job applications, exam registrations, scholarship portals, visa and passport systems and many government websites set a maximum file size, and some also set a minimum. If your file is even a few kilobytes over the limit, the upload fails with a vague error. Reducing the size by guessing is slow, because you have to save, check the size and try again. This tool does the guessing for you and gives you a file that fits on the first try.
How the Tool Reaches Your Target Size
JPG and WEBP are lossy formats, which means the quality setting controls the file size. The tool encodes your image at many quality levels and uses a binary search to find the highest quality that still stays under your limit. That keeps the picture as sharp as possible for the size you asked for.
If the image is so large that even the lowest quality is too big, the tool also reduces the pixel dimensions step by step and tries again. This is why a 5 MB photo can still become a clean 20 KB file, just at smaller dimensions.
What does Pad JPG to exact size do?
Sometimes a form needs a file of exactly 100 KB rather than at most 100 KB. When you tick the padding option, the tool adds harmless filler bytes to the end of the JPG file until it reaches the exact target. Image viewers ignore these bytes, so the picture looks the same.
Common Target Sizes and Where They Are Used
| Target size | Typical use |
|---|---|
| 20 KB | Signatures and small ID thumbnails |
| 50 KB | Passport size photos on exam and job forms |
| 100 KB | Profile photos and scanned certificates |
| 200 KB | Document scans and application attachments |
| 500 KB to 1 MB | Email attachments and website images |
These are common examples only. Always read the exact limit shown on the form you are filling in.
Tips for Better Quality at Small File Sizes
- Start from the original photo instead of a screenshot or an already compressed copy.
- Crop away empty space first. Fewer pixels mean a smaller file at the same quality.
- Use JPG for photographs and WEBP when the site accepts it.
- Avoid very small targets for detailed pictures. A 20 KB limit suits a face or a signature better than a busy landscape.
JPG vs WEBP for Small Files
JPG works everywhere, and almost every government or exam portal accepts it. WEBP is newer and usually produces a smaller file at the same visual quality, which helps on websites and blogs. If a form lists only JPG or JPEG, choose JPG.
Related Image Tools
Need a photo in the right dimensions first? Use the Passport / Visa Photo Resizer. To check what is hidden inside a picture, try the EXIF Metadata Remover and Viewer. To change the file type, use the All-in-One Image Converter, and for print sizes see the Image DPI Calculator.
Frequently Asked Questions
How do I compress an image to 50KB?
Upload your image, press the 50 KB button (or type 50 and choose KB), and wait for the result. The tool searches for the best quality that stays under 50 KB and shows the final size next to the Download button.
Can I compress an image to exactly 20KB?
Yes. Choose 20 KB as the target. The tool gets as close as it can without going over. If the form needs exactly 20 KB, also tick the option to pad a JPG file to the exact size.
Does compressing reduce image quality?
JPG and WEBP compression always removes some detail, but the tool uses the highest quality that fits your limit. The smaller the target, the more visible the loss, so pick the largest size your form allows.
Why is my compressed file smaller than the target?
If the image already fits at high quality, the tool cannot make it bigger without wasting space. This is normal and is usually accepted by forms that only set a maximum. Use the padding option if you need the exact size.
Are my images uploaded to your server?
No. Compression happens inside your browser with your own device. Your files never leave your phone or computer.
Which format is best for small file sizes?
WEBP gives the smallest files at a similar quality, but JPG is accepted almost everywhere. Use JPG for official forms and WEBP for websites.
Can I compress more than one image at a time?
Yes. Add several images together, and each one is reduced to the same target size. Use Download All to save every result.
What if the image cannot reach my target size?
The tool lowers quality first and then reduces the pixel dimensions automatically. If it still fails, the target is too small for that picture, so try a slightly larger size.
Tips for Choosing an Image File Size
A smaller file is not always better if it makes the image hard to read. Check visual quality, dimensions and format after compression.