does image to pdf support heic or webp

This Image to PDF tool only accepts JPG (JPEG) and PNG files — the upload step checks each file's type and silently filters out anything that isn't one of those two, so a HEIC, WEBP, GIF, or TIFF file selected alongside valid JPGs and PNGs simply won't appear in the image list, without necessarily showing an error for that specific file.

This is a deliberate scope decision rather than a limitation to work around: the site has separate, dedicated tools for each of those other formats, each handling that format's real quirks properly instead of trying to cram everything into one generic converter. HEIC (the format iPhone photos commonly save in) has its own HEIC to PDF tool that accounts for HEIC's inconsistent, device-dependent browser support. WEBP has its own WEBP to PDF tool. GIF has its own GIF to PDF tool, including a note on whether animation is preserved. TIFF has its own TIFF to PDF tool, including a note on TIFF's limited native browser support.

If you're not sure what format your image actually is, most phones and cameras save JPG by default, and most screenshots on Windows and Mac save PNG — so if your upload isn't appearing in the list here, it's worth checking the file's actual extension or format before assuming the tool is broken.

Once you've converted a non-JPG/PNG image using its dedicated tool, you can always bring the resulting PDF back here if you need to combine it with other JPG/PNG-based pages — though at that point you'd typically use the PDF Merge tool instead, since this tool's input stage is images specifically, not existing PDFs.