Bulk Image Resizer

Resize multiple images at once and download as a ZIP file.

How to Use Bulk 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

How many images can I batch resize at once?

PDFtiny has no hard limit on batch image count. You can upload and process 50, 100, or more images simultaneously. Processing time scales with image count and your device speed.

Can I resize images to different dimensions per image in a batch?

The batch resizer applies the same dimensions or percentage to all uploaded images. For different dimensions per image, process each image individually using the Image Resizer tool.

What formats can I resize in bulk?

JPG, PNG, and WebP are fully supported for batch resizing. HEIC images should first be converted to JPG using the Image Converter, then batch resized.

How do I download all the batch-resized images?

After batch processing, click