Konvizi
Free No upload
Change the width and height of your photos, in pixels or as a percentage, without uploading anything.
Drop your JPG, PNG, WebP files here
or
Your files stay on your device
Konvizi’s “Resize image” tool is free, with no sign-up, no watermark and no file limit. All the processing happens in your browser, on your device: your files are never uploaded to a server, which makes it suitable for personal and confidential documents.
Drag your JPG, PNG or WebP files into the area above or click “Choose files”.
As a percentage (50% = half the size), or in pixels: enter the width, the height, or both. Click “Resize”.
Each image keeps its format and shows its new dimensions. Get them one by one, or with “Download all”.
Photos from recent phones are often 4,000 pixels wide, far more than any screen shows. Bringing them down to 1,200 or 1,600 pixels cuts their weight by four or more with no visible loss. It is also how you meet a required size: profile picture, listing photo, image for a website or an online shop.
These are the three most common image formats: JPG for photos, PNG for screenshots and logos (it supports transparency), WebP for websites. Each image keeps its format: a PNG stays a PNG, transparency included.
Your photos stay on your phone or computer: family pictures, photographed ID documents and screenshots are never sent online. The image is redrawn by your browser, so the output file does not carry the original’s EXIF metadata, including GPS location: handy before sharing a photo. And since nothing is uploaded, dozens of images convert in seconds.
Your files never leave your device. No upload, no storage.
No upload and no queue: the conversion starts right away.
As many files as you like, with no imposed size limit.
No sign-up, no watermark, no subscription.
| Konvizi | Typical online converter | |
|---|---|---|
| Where your files are processed | In your browser, on your device | On the service’s servers |
| Upload to the internet | None | Required, then you download the result |
| Storage of your files | None: nothing is stored | Stored on a server, at least while processing |
| Waiting time | Starts instantly | Upload time, sometimes a queue |
| Account | Never required | Often required beyond a few files |
| Watermark and limits | No watermark, no maximum number | Common on free plans |
Yes, completely. No sign-up, no watermark, no limit on the number of files.
No. Everything happens in your browser, on your device. Your files are never sent over the internet: nobody but you can see them.
No, as long as “Keep proportions” is checked: if you enter both a width and a height, the image is scaled to fit inside that box without being stretched. Uncheck it only if you need those exact dimensions, even if the image gets distorted.
Yes, with a percentage above 100% or larger dimensions. But enlarging does not add detail: a small image blown up looks blurry. Shrinking, on the other hand, loses almost nothing.
Open your browser’s developer tools (F12 key), go to the “Network” tab and run a conversion: no request carries your file. The site also enforces a security rule (Content-Security-Policy) that forbids the browser from contacting any site other than konvizi.com, and konvizi.com is a static site with no service able to receive files.
Yes. Konvizi works in the browser of your phone or tablet (Safari, Chrome…) just like on a computer, with no app to install. Very large files are processed faster on a computer, which has more memory.