About this tool
Free Image Compressor to Specific KB
Use this free Image Compressor to Specific KB when a website, application form, job portal, exam portal, or email attachment requires a photo below a fixed file-size limit. Upload a JPG, PNG, or WebP image, enter the maximum size you need in kilobytes, and create a smaller JPG or WebP directly in your browser. You can compress an image to 20KB online, reduce an image size to 50KB, compress a JPG to 100KB, prepare an image under 200KB, or enter any custom target from 5KB to 5000KB. Unlike a basic quality slider, this target-size image compressor tests multiple encoding quality levels and checks the resulting file size automatically. When quality reduction alone is not enough, the optional automatic resizing setting can reduce the image dimensions in controlled steps until the output reaches the requested limit. The result panel shows the original size, compressed size, final dimensions, encoder quality, and percentage reduction before you download the file. The tool processes the selected image locally in your browser. The image is not uploaded to WebToolsEdge for compression, which is useful when working with personal photos, identity-document scans, application pictures, product images, and other files you prefer to keep on your device. Modern browser encoders can produce slightly different byte sizes, so the tool targets a file at or below your selected limit rather than promising an exact byte-for-byte result. Choose JPG for broad compatibility with forms, websites, email, and document systems. JPG does not support transparency, so transparent areas are placed on a white background. Choose WebP when the destination supports it and you want efficient compression with transparency support. PNG input is accepted, but the compressed download is created as JPG or WebP because these formats provide adjustable lossy compression needed to meet small KB targets. Very small targets can require visible quality loss or smaller dimensions, especially for detailed photographs and large screenshots. Start with the actual limit required by the destination instead of choosing an unnecessarily low value. Always preview the result and confirm that important text, faces, signatures, and fine details remain readable before submitting the compressed image.
Need a different image workflow? Turn encoded data into a file with the Base64 Image Converter, or convert document pages before compression using the PDF to JPG Converter. Browse all Image Tools for related browser-based utilities.
Step by step
How to use Image Compressor to Specific KB
- 1
Choose a JPG, PNG, or WebP image up to 25 MB from your device.
- 2
Enter the maximum output size you need, such as 20KB, 50KB, 100KB, or 200KB.
- 3
Select JPG for broad compatibility or WebP for efficient compression and transparency support.
- 4
Keep automatic resizing enabled if the tool may reduce dimensions to reach a difficult target.
- 5
Click Compress to target and review the output size, dimensions, quality, and reduction.
- 6
Preview the result, then download the compressed image to your device.
Highlights
Image Compressor to Specific KB features
Custom target size from 5KB to 5000KB
Compress JPG, PNG, and WebP input images
JPG and WebP output options
Automatic quality search for a file at or below the target
Optional dimension reduction for difficult size limits
Original and compressed image previews
File size, dimensions, quality, and reduction details
Private browser-based processing without image upload
Questions
Image Compressor to Specific KB FAQ
How do I compress an image to a specific KB size?+
Upload a JPG, PNG, or WebP, enter your maximum size in KB, select an output format, and click Compress to target. The tool adjusts quality and can reduce dimensions until it produces a file at or below the requested limit.
Can I compress an image to 20KB online?+
Yes. Enter 20 in the target field. Large or detailed images may need substantially lower quality and smaller dimensions to fit under 20KB, so review the preview before using the result.
Can I reduce an image size to 50KB, 100KB, or 200KB?+
Yes. You can enter 50, 100, 200, or any custom target between 5KB and 5000KB.
Will the compressed image be exactly the target size?+
The tool aims to create a file at or below your maximum target. Browser encoders do not provide exact byte-level control, so the result may be slightly smaller than the number entered.
Why did the image dimensions become smaller?+
If reducing encoding quality cannot meet the target, automatic resizing lowers the width and height in controlled steps. Turn that option off if the original dimensions must be preserved, although some targets may then be impossible.
Does JPG support a transparent background?+
No. When a transparent PNG or WebP is converted to JPG, transparent pixels are placed on a white background. Choose WebP output if you need to preserve transparency.
Is my image uploaded to WebToolsEdge?+
No. Reading, resizing, compressing, previewing, and downloading happen locally in your browser.
Does image compression reduce quality?+
Lossy JPG and WebP compression removes some image information to reduce file size. Lower targets generally require more quality loss or smaller dimensions.
Which output format should I choose?+
Choose JPG when maximum compatibility is important. Choose WebP when the destination accepts it and you want efficient compression or transparency support.
Why can the tool not reach my target?+
The target may be too small for the image content or required dimensions. Enable automatic resizing, choose WebP, use a less aggressive target, or crop unnecessary parts before compressing.