The image corner

Convert an image from one format to another

Drop an image in. The tool offers you ONLY the formats your browser can actually write, and it reads the result back to check it really got the one you asked for.

JPEG · PNG · WebP · AVIF · GIF · BMP50 MB per file

Drop an image hereJPEG, PNG, WebP, AVIF, GIF or BMP. Nothing will be sent: the file is read here, on your device.Choose a file

This file is beyond what this tool does

This tool needs JavaScript to work, and that is precisely because it works ON YOUR DEVICE: without JavaScript, your file would have to be sent to a server. The instructions and the limits of the tool, however, can be read without JavaScript, just below.

How this is built

Your file never leaves your device

This tool works entirely inside your browser. Not one byte of your file is sent anywhere, and nothing is kept once the tab is closed.

Checkable in ten seconds, without taking our word for it:

Open your browser's inspector: the F12 key (or Ctrl+Shift+I, or Cmd+Option+I on a Mac).
Go to the “Network” tab, then clear the list.
Process a file on this page. The list stays empty: no request goes out.
To go further: cut your connection and do it again. The tool still works.

This absence of requests is also checked BY MACHINE before every release: a lock drives a real browser, processes a real file, and refuses to publish if a single byte goes out.

The proof page, step by step and in pictures

Going further

InstructionsHow it works

These six formats OPEN in every up-to-date browser. On the OUTPUT side the list is shorter, and it depends on the browser: that is why it is measured at run time rather than announced. The compatibility matrix gives the detail, browser by browser.

VerifyThe proof, step by step

The network inspector check, explained one gesture at a time, with screenshots.

The cornerThe image corner

The other tools in this corner of the workshop.

UnderstandHow this is built

The formats actually handled, browser by browser, and what we ruled out.