What image formats are supported?

The tool supports JPEG, PNG, and WebP formats. Output is always high-quality JPEG for maximum compatibility, unless the original was PNG which will maintain transparency.

Is there a file size limit?

Yes, you can upload images up to 50MB in size. The tool processes everything locally in your browser, so performance depends on your device capabilities.

Will my image quality suffer?

The tool uses intelligent compression that balances file size with visual quality. If your target size is very small (e.g., 20KB for a large photo), some quality loss is inevitable, but the algorithm preserves as much detail as possible.

Yes, completely free to use with no registration required. There are no watermarks or limits on the number of images you can process.

Image Resize to KB | TinyToolbox

Upload any image file (JPEG, PNG, WebP) and set your desired target file size in kilobytes. The tool intelligently compresses your image using an iterative binary search algorithm that adjusts quality and dimensions to reach your target size. Perfect for meeting upload requirements for government forms, job applications, or websites with strict file size limits. The compression happens entirely in your browser—your images never leave your device.

Set your target size

Enter your desired file size in KB using the input field or quick-select buttons (50KB, 100KB, 200KB, etc.).

Upload your image

Drag and drop an image onto the upload area, or click to browse for a file from your computer.

Wait for compression

The tool automatically processes your image, trying different quality levels and dimensions to reach your target size.

Compare and download

Review the before/after comparison showing file size reduction, then click Download to save your compressed image.

Image Resize to KB

如何使用 Image Resize to KB

Set your target size

Upload your image

Wait for compression

Compare and download

常见问题

更多 Image 工具

二维码生成器

二维码扫描器

Image Metadata Viewer

Batch Image Resizer