The ultimate image compressor. Enter any custom KB size, protect your original image dimensions, and convert to JPG, PNG, or WebP instantly.
Most image compressors on the internet offer generic options like "Low, Medium, High" or fixated buttons for common sizes like 20KB or 50KB. But what if a specific government portal, university application, or client specifically requests an image to be exactly "Under 125KB" or "Max 350KB"?
Welcome to the Precision Mode by ReduceSize.online. Here, you are in complete control. Just type your required number in the Target File Size box, and our smart binary-search algorithm will loop through dozens of quality and scaling metrics in milliseconds to generate an image that perfectly hits your target.
When you force a massive 5MB image to compress down to a specific size like 50KB, typical compressors do it by drastically shrinking the physical dimensions (e.g., from 4000x3000 pixels down to 400x300 pixels). While this saves space, it destroys the resolution of your document or photo.
Our unique Dimension Protector 🔒 solves this. If you check this box, our algorithm will strictly maintain your image's original Width and Height. It will rely purely on advanced data compression logic to reduce the KB size. This is heavily utilized by web developers and professional photographers who need their images to stay large on the screen but load instantly on the server.
While reducing the size, you can also change the core structure of your image using our converter:
Have a folder full of 50 images that all need to be under exactly 150KB? You don't need to do them one by one. Just select all 50 photos and drop them into the upload zone. The Precision Tool will process them sequentially, applying your exact KB target to every single file, saving you hours of manual editing.
How do I reduce my image to an exact KB size?
Simply upload your image, type your desired size (e.g., 85) in the 'Target File Size' box, and click Generate. Our precision algorithm will optimize your image to hit that exact target without unnecessary quality loss.
What does 'Protect Image Dimensions' do?
Normally, to reach very small KB sizes, tools shrink the physical width and height of an image. If you check 'Protect Dimensions', our tool will keep your original pixels intact and strictly use quality-compression to reduce the size.
Can I convert a PNG to JPG while reducing size?
Yes! Use the 'Output Format' dropdown to select JPG, PNG, or WebP. The tool will convert your image format and reduce its file size simultaneously.
Why choose WebP format?
WebP is a modern image format developed by Google. It provides superior lossless and lossy compression, meaning a WebP image will look significantly sharper at 50KB compared to a standard JPG at the same 50KB size.