Photos. JPEG and PNG photos go straight into the PDF, and other picture formats that Windows can open are converted on the way in. Each one is scaled to fit the page width and at most about four inches tall. Photos larger than 1600 pixels on the long side are scaled down before they are embedded, which is ample for print and keeps a chat with hundreds of photos a manageable file.
Stickers. WhatsApp stickers are WebP images, named STK- on Android and with STICKER in the name on iPhone. ThreadBind recognizes them, keeps their transparency, and prints them at most about 1.3 inches across, the way they look in the chat.
Voice notes and audio. OPUS, M4A, MP3, AAC, OGG, WAV and AMR files are written under their message as Audio followed by the file name. Android voice notes, named PTT-, are included.
Videos. MP4, 3GP, MOV, MKV, AVI, WEBM and M4V files are written as Video followed by the file name.
Documents and contacts. PDF, DOC, DOCX, XLS, XLSX, PPT, PPTX, TXT, CSV, RTF and ZIP files shared in the chat are written as Document lines, and shared contact cards (VCF) as Contact lines.
Links, not paths. Each named file is written as a link to its file name. The link is relative, so the PDF never carries your folder path or Windows user name, and it points at the file when the PDF is kept in the export folder.
Missing files. Exports sometimes mention files that did not make it into the folder. ThreadBind matches names regardless of letter case, writes Missing file and the name at the message, and adds a Missing files section at the end with each name and the time it was sent.
Pictures off, when you want text only. Turn off Include pictures in the PDF in the Export PDF dialog and every attachment is listed by name instead, for a shorter document.
The count at the end. Export complete shows a line such as 2 pages, 3 pictures placed, 2 files listed by name, 2 missing, so you know what went in before you open the file.