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Select a JPG, PNG or WebP image up to 20 MB.
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Compress Image to 20 KB
Reduce a JPG, PNG or WebP image to 20 KB or less. Preview your compressed JPEG before downloading.
No photo uploadsNo watermarksWorks in your browser
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Maximum 20 MB per image
Target size
The result targets this upper limit. Dimensions may be reduced to fit.
Processed on your device
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Your photos stay in this browser. No account needed.
Check signatures and text at their intended display size. Dark ink on a plain, light background usually stays clearer than a detailed or shadowed scan.
Quick steps
How to compress an image to 20 KB
Check the target
20 KB is selected for this page. You can choose another preset if you need it.
Review and download
Check the actual file size and image preview, then save the JPEG.
A few useful details
A little preparation helps at 20 KB
Twenty kilobytes leaves very little room for detail. Before compressing, crop away blank margins and background you do not need. This is especially useful for a small signature or a tightly framed profile photo.
The tool will lower JPEG quality and, when necessary, reduce the dimensions. Check the result at the size where it will be used. A signature that fits the limit but is too faint to read will not help with an application.
If a form also requires a large width and height, a 20 KB limit can be difficult to meet without visible loss. Follow the form’s instructions and keep a clear original so you can try again.
Before you save the result
Check signatures and text at their intended display size. Dark ink on a plain, light background usually stays clearer than a detailed or shadowed scan.
The converter uses 1 KB = 1,024 bytes. If an upload form uses a stricter decimal limit, choose a slightly lower target in the custom-size reducer.
Make the most of a very small upload allowance
Remove empty space before lowering quality
A signature scan may contain much more paper than signature. Cropping the unused margin gives the useful part more of the available pixels and bytes. Keep a safe border, and do not cut off the start or end of a stroke.
Watch light lines and small writing
Thin grey handwriting can fade into a white background after a tight export. Check the signature or text at the size where the form will show it. If it is no longer easy to read, try a clearer source rather than repeatedly reducing the same copy.
Check the pixel requirement separately
A small KB limit does not tell you the required width and height. If the form gives both, write them down before starting. This reducer may shrink the dimensions to meet 20 KB, so inspect the exported dimensions as well as its file size.
Leave a little room below the limit
A website may count 20 KB as 20,000 bytes rather than 20 × 1,024 bytes. If a file very close to the limit is rejected, try 19 KB in the custom-size tool. Also confirm that the website accepts JPEG and does not require a different format.
Visual examples
See what compression changes
Actual sample exports at three quality settings. These examples do not promise a particular KB target for your own image.
Input![Keep fine detail — Input]()
After![Keep fine detail — After]()
EXAMPLE 01
Keep fine detail
An 85% JPEG quality example keeps a generous detail budget. Compare hair, leaves and fine edges before using the export.
Actual sample exports at three quality settings. These examples do not promise a particular KB target for your own image.
Input![Make everyday images lighter — Input]()
After![Make everyday images lighter — After]()
EXAMPLE 02
Make everyday images lighter
A 65% quality example can suit images displayed at smaller sizes. The measured file sizes show whether the export actually saves space.
Actual sample exports at three quality settings. These examples do not promise a particular KB target for your own image.
Input![Explore the size–quality trade-off — Input]()
After![Explore the size–quality trade-off — After]()
EXAMPLE 03
Explore the size–quality trade-off
A 40% example makes compression more aggressive. Look for blocky textures or rough edges and choose a higher quality when needed.
Actual sample exports at three quality settings. These examples do not promise a particular KB target for your own image.
Frequently asked questions
Does the file have to be exactly 20 KB?
Usually an upload limit means “no larger than 20 KB.” This tool treats it as an upper limit. Check whether your form also specifies a minimum.
Can I use a PNG or WebP?
Yes, if the browser can read it. The result is JPEG, so any transparent area will be placed on white.
What should I do if the result is blurry?
Start again from the original. Crop unused space, or choose a larger limit if the destination allows it. Check text and faces before submitting the image.
Why is a file close to the limit being rejected?
The website may count KB differently or have another requirement. Try a slightly lower value in Custom Image Size Reducer, and check its pixel and format rules too.
Is a 20 KB photo suitable for printing?
File size alone cannot tell you that. Check its pixel dimensions and intended print size; a very small export may have too little detail for a useful print.
Should I use this for a full document page?
A full page of small text is difficult to keep readable at 20 KB. Follow the destination’s instructions and inspect every required detail before submitting it.
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