Reduce Image Size
Reduce image file size to a specific KB value automatically.
How to Use Reduce Image Size
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
How do I reduce a photo to under 20 KB or 50 KB for online applications?
Upload your photo, type your target KB (e.g.,
Does reducing KB size change the pixel dimensions of my photo?
By default, it reduces file size via smart JPEG quantization while keeping pixel dimensions unchanged. If the target KB is extremely low, optional dimension scaling is available.
Can I reduce PNG file size in KB?
Yes, PNG images can be optimized losslessly or converted to high-efficiency WebP/JPEG to meet strict KB caps.
Can I batch reduce multiple photos to the same KB threshold?
Yes, process multiple photos and ensure all files meet your portal\