Does my image stay on my device?
A direct answer, because the honest one depends on the conversion. This explains which operations are local, which need the server, and how the tool tells you which was which.
Many converters claim that files "never leave your device". That is sometimes true and sometimes not, and a blanket claim is the kind of thing that turns out to be false for exactly the file you cared about. Here is the specific answer for this tool.
Conversions that run entirely in your browser
If your browser can decode the input and encode the output, the whole conversion happens locally using the canvas element, and no part of the image is transmitted. That covers most everyday cases: PNG, JPG, WebP and AVIF output, and GIF, BMP, ICO and SVG input on current browsers. HEIC also runs locally on platforms that ship a HEIC decoder, which includes Safari and recent Windows installations with the codec extension installed.
Conversions that need the server
When the browser cannot decode a format, the only way to convert it is to send it somewhere that can. That applies to HEIC on browsers without a decoder, to AVIF on older browsers, and to TIFF and some BMP variants that the canvas does not accept. In those cases the file is uploaded, converted, and returned in the same response.
How to tell which happened
Every converted file is labelled. Files processed locally show an "on device" badge and a note reading that they were converted in your browser. Files that were sent to the server show a "server" badge. The summary line after a batch states how many files were uploaded. You never have to guess.
What the server does with an uploaded file
It is held in memory for the duration of the request and is not written to disk. Nothing is logged about its contents, and the response is marked as non-cacheable so no intermediary stores it. There is no account, no history and no gallery, so there is nowhere for an uploaded image to persist even if someone wanted it to. The privacy policy states the same thing in the same terms.
The practical advice
For anything sensitive, check the badge. If it says "on device", the file never moved. If it says "server" and you would rather it did not, the conversion is not one this site can do locally, and the honest options are to use software on your own machine or to accept the upload.
Convert an image now
The converter reads PNG, JPG, GIF, BMP, TIFF, ICO, WebP, AVIF, HEIC and SVG, and writes PNG, JPG, WebP, GIF, BMP, TIFF, ICO, AVIF and PDF. It states for each file whether the work happened on your device or on the server.
Converters mentioned in this guide
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Convert WebP to JPG
Convert WebP images to JPG in your browser. Transparency is composited onto white, and nothing is uploaded when
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Convert PNG to JPG
Convert PNG images to JPG and choose the quality. Transparency is composited onto white because JPG has no alpha
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Convert HEIC to PNG
Convert iPhone HEIC photos to PNG. Your browser decodes HEIC where it can, and a server with Imagick and libheif
More guides
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GIF and animation: what a still converter cannot do
Animated GIFs need a format that stores a sequence of frames. Converting one to PNG, JPG or WebP means keeping a single frame, and this tool says so instead of quietly dropping the rest.
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Resizing images without wrecking them
Resizing changes an image more than most people expect. Here is what the three fit modes do, why enlarging is a losing game, and how to choose target dimensions.
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What is a HEIC file, and why is it awkward?
iPhones save photos as HEIC by default. The format is better than JPG on almost every axis, and that is exactly why it causes trouble: support outside Apple devices is uneven.