Image Size Reducer
Automatically compress an image down to a target file size in KB or MB.
ℹ️ About Image Size Reducer
Image Size Reducer works backwards from a target file size rather than a quality percentage — useful when a form, application portal or email system has a strict upload size limit like 100 KB or 2 MB. Enter your target size in KB or MB, and the tool automatically tests a range of quality levels in your browser until it finds the setting that lands as close as possible to that target, saving you the trial-and-error of manually re-exporting at different quality levels.
🛠️ How to Use Image Size Reducer
Upload your image, enter your target size and choose KB or MB, then select JPG or WebP as the output format (PNG has no adjustable quality, so use Image Compressor for that). Click the button and the tool automatically searches for the closest match, then downloads the result and tells you exactly how close it landed to your target.
📥 Input → ⚙️ Process → 📤 Result
Input
An image file
Process
Compresses or reduces image data according to the available quality and size controls.
Result
A smaller image file you can download.
❓ Frequently Asked Questions
Is Image Size Reducer really free?
Yes. The tool is available without a required account, watermark or paid conversion step.
Are my files uploaded?
No. ToolBoxly is designed to process supported files locally in your browser. Your source file is not uploaded to a ToolBoxly processing server.
Can I use the result commercially?
Yes, the tool itself does not claim ownership of your source files or generated output. You remain responsible for having the necessary rights to the material you process.
Why might a result look different?
Export settings, source format, browser capabilities and the type of content can affect the final file. Review the output before replacing the original.
Does it work on mobile?
Yes. The interface is responsive and works in modern mobile browsers, although very large files may be limited by device memory.
Search use cases
This browser-based tool is useful for 100KB, 200KB and other file-size limits for websites, forms and uploads. Choose the right output settings for your specific requirement and review the result before replacing your original file. ToolBoxly focuses on simple, fast utility workflows without a required account.