Why you have a TIFF in the first place
TIFF is the format of scanners, fax systems and archives. Office multifunction printers often save scans as TIFF by default, document management systems export to it, online fax services deliver received faxes as TIFF, and libraries and photo labs use it for high-quality masters. It's a solid format for storage, but it's awkward to share.
Many phones, browsers, email previews and upload portals don't open TIFF, and the files tend to be large. When a bank, a court portal, a school or an employer asks for a PDF, converting the TIFF is the simplest way to send what you scanned.
Multi-page TIFF files keep all their pages
A single TIFF can hold several pages, for example a ten-page contract scanned in one pass or a fax with a cover sheet. Many basic converters only take the first page and silently drop the rest. Here every page inside the TIFF becomes its own page in the PDF, in the same order.
You can also select several TIFF files at once, plus JPG, PNG or other images, and drag them into the order you need. They all end up in one PDF, ready to upload as a single attachment.
This is especially handy with received faxes, which often arrive as one multi-page TIFF. Converting it gives you a normal PDF you can read on your phone, forward, sign or file.
Page size, orientation and margins
Choose Letter for the US and Canada or A4 for the UK, India and most other countries, so the PDF prints at the size the recipient expects. “Same as image” makes each page match the scan exactly, which keeps the original proportions of a receipt or an odd-sized form.
Orientation can be automatic, portrait or landscape; automatic turns each page to suit its image, useful when a scan mixes portrait pages with a landscape table. Margins can be none, small or large. If the scan already has white borders, “none” avoids adding more.
Private, free and done in your browser
Scanned documents often contain signatures, ID numbers, medical results or financial details. The conversion runs entirely in your browser, so your TIFF files are never uploaded or stored. There's no account, no watermark and no usage limit, only your device's memory with very large batches.
Scans saved as TIFF are often uncompressed, so the PDF can be heavy. If a portal has a size limit, send the result to Compress PDF next. If the PDF needs searchable text, OCR PDF can add a text layer afterward.