Client-Side Image Converter
Every conversion happens inside your browser tab — not on our servers. Convert HEIC, PNG, JPG, WebP and more with the Canvas API and WebAssembly, and prove it in your Network tab.
Drop your image to convert
or click to browse — paste (Ctrl+V) works too
How Our Privacy Engine Works
When you drop an image onto VisualConvert, our code runs entirely inside your device's web browser using modern web standards (Canvas API & WebAssembly). Unlike traditional converters that upload your photos to remote servers, process them there, and send them back, VisualConvert processes everything locally in your computer's memory. You can verify this anytime: open your browser's Developer Tools (F12), switch to the Network tab, and drop a file — you will see zero upload requests!
Most “online” image converters are really server converters with a web page in front: you pick a file, it is uploaded to a machine you cannot see, processed there, and sent back. A client-side converter flips that model — the code that does the work is downloaded to your browser once, then runs entirely on your device. Your file is opened in local memory, converted, and offered back for download without a single byte being transmitted.
VisualConvert is built this way from the ground up. The Canvas API handles the pixel work your browser already does natively, and WebAssembly fills in the formats browsers cannot decode on their own, such as HEIC from iPhones. Because it is all local, there is no upload queue, no server cost per conversion, and nothing for anyone to intercept, log, or retain.
What “client-side” actually means
Client-side means the processing runs on the client — your computer or phone — rather than a remote server. The app’s JavaScript and WebAssembly are fetched once when the page loads, and every conversion after that executes in the browser’s own sandbox. The file you choose is read with the FileReader/Canvas APIs into memory that only your browser controls.
Verify it yourself in 20 seconds
You do not have to take this on trust. Open your browser’s developer tools (F12), switch to the Network tab, and convert an image. You will see the app’s own assets load, but zero requests carrying your file outward. The conversion completes with the network idle — proof the work happened locally.
Why developers and privacy-minded users prefer it
No upload means no exposure: sensitive scans, unreleased product shots, and personal photos never travel. It is also faster for large files (no upload/download wait) and it keeps working when the connection drops. For teams handling regulated data, “the file never left the device” is a far stronger guarantee than a deletion promise.
The formats it handles, all locally
Convert between JPG, PNG, WebP and AVIF, decode HEIC/HEIF from Apple devices, turn images into PDF, and compress or resize — every operation runs client-side. Output is drawn at full resolution with no watermark, and nothing is ever re-uploaded to finish the job.
Related tools
Frequently asked questions
Does a client-side converter upload my files?
No. The defining feature of a client-side converter is that files are processed in your browser and never sent to a server. You can confirm this in the DevTools Network tab — no upload requests are made.
How can it convert HEIC without a server?
A WebAssembly decoder compiled to run in the browser reads the HEIC data at near-native speed, entirely on your device — no server-side conversion is needed.
Is client-side conversion slower?
Usually it is faster, because there is no upload and download round-trip. Modern browsers convert typical photos in well under a second on your own hardware.
Does it work on mobile?
Yes. It runs in any modern mobile browser — the processing uses your phone’s own CPU, so your photos never leave the device.