PhotoResizer

Format converter

Convert Image to WebP

Convert Image to WebP convert JPG or PNG images to compact WebP files directly in your browser.

WebPPrivate on-device processingActual result shown
  1. 1Choose image
  2. 2Adjust
  3. 3Download

Private by design. Your image is processed locally in your browser and is not uploaded to our server.

Purpose

What this tool does

This converter keeps the original pixel dimensions and re-encodes each selected image as WEBP. Conversion happens locally, and batch results can be downloaded together as a ZIP. The original pixel dimensions are preserved and the output is fixed to WEBP. Processing happens entirely on your device — your image is decoded, resized, compressed, and prepared for download without being uploaded to any server.

Output

Supported formats and output

Upload JPG, PNG, or WebP. Choose JPG for broad form compatibility and smaller files, WebP where it is accepted, or PNG when transparency and lossless output matter more than an exact KB target.

The result card reports the actual pixel dimensions, format, and file size rather than assuming the target was reached. You can verify the output before downloading.

Detailed instructions

How to use it

  1. 1

    Choose a local JPG, PNG, or WebP image from your device or camera.

  2. 2

    Select the output format, tap Prepare Image, verify the result visually, and download it to your device.

Before uploading

Common limitations

WebP encoding must be supported by the browser. Re-encoding can change file size and does not improve detail that is missing from the source image.

Very large photos can exceed a phone's available memory. If processing fails, try a smaller source image. PNG cannot be compressed by changing quality like JPG or WebP.

Privacy

Private browser processing

Your selected image is decoded, resized, compressed, and downloaded locally in your browser. Normal tool operation does not upload the image or its original filename to our server. The processed result stays on your device until you choose to save or share it.

Practical guidance

Next-generation WebP compression: cutting file size while retaining quality

WebP is Google's modern image format designed for superior lossy and lossless web compression. WebP images are typically 25% to 34% smaller than equivalent JPEGs while maintaining identical visual clarity. Converting your image library to WebP dramatically reduces web page load times and boosts Google Core Web Vitals performance scores.

Frequently asked questions

What result does Convert Image to WebP create?

The original pixel dimensions are preserved and the output is fixed to WEBP. The result card shows the actual dimensions, format, and KB size before download so you can verify it meets your form requirements.

Is my image uploaded to a server?

No. Normal image processing runs entirely in your browser using your device's CPU. The downloaded file stays on your device. No image data is transmitted to our server.

Why might the requested KB size be impossible?

Detailed images, large dimensions, format overhead, and the minimum quality boundary can prevent a smaller file. Try smaller dimensions, a larger limit, or switch from PNG to JPG or WebP which support quality-based compression.

Can I use this on my phone?

Yes. PhotoResizer is designed mobile-first and works on any modern smartphone browser. All controls have minimum touch target sizes and the interface adapts to small screens.