Convert files in your browser, with nothing uploaded

Which converter fits the problem

What went wrong	Use	What you get
A site or a Windows computer will not open a .heic photo	HEIC to JPG	Ordinary JPG files, one per photo, or all of them in one zip
An assignment, a form or a claim asks for one PDF, and you have photos	Photos to PDF	One PDF, one photo per page, in your order
A PDF is over an upload or email limit	Compress PDF	A smaller copy, made to fit the size you pick
A file opens on your computer but not on someone else's	Document viewer	The file shown in the browser, no app needed

For students and teachers

School portals set their own rules: an upload limit chosen by the school, and often a list of accepted file types that leaves out .heic. That is how a photo of a worksheet taken on an iPhone ends up rejected the night it is due. The usual fix is two steps: convert the photos to JPG or straight to one PDF, and keep that PDF under the portal's limit. All three tools here run in the browser of a school Chromebook or a phone, with nothing to install.

Teachers can use the same tools in the other direction: compress a scanned handout before posting it, or turn photos of a whiteboard into one PDF for students who were absent.

For nonprofits

Grant portals and funder forms tend to have strict size limits and ask for single PDFs. Receipts, signed forms and site photos usually arrive from volunteers as phone pictures. Photos to PDF and Compress PDF turn those into something a portal accepts, without sending donor or client records through another company's servers.

Why the work happens on your device

Most online converters upload your file, process it on a server and send it back. These pages load the converter into your browser instead, using open-source libraries (pdf-lib, Mozilla's PDF.js and heic2any) served from FileSeen itself. You can check: open your browser's developer tools, watch the Network tab, and convert a file. No request carries it anywhere.