Image Resizer
Resize images by pixels or percentage with aspect ratio lock.
How to Use Image Resizer
- 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
Can I lock aspect ratio while resizing images?
Yes. By default, the aspect ratio lock is enabled so changing width automatically scales height proportionally, preventing image stretching or distortion.
What interpolation method is used when scaling down photos?
PDFtiny uses high-quality bicubic/Lanczos canvas resampling, preserving fine details and preventing jagged edges when reducing image dimensions.
Can I convert format while resizing?
Yes, you can choose whether to output your resized image as JPG, PNG, or WebP with customizable compression quality.
Is there a limit on image dimensions?
You can resize photos up to 8K resolution (7680×4320 px) directly in your browser without memory issues.