TIFF to PDF, one page per page. Nothing ever uploads.

A little. Each TIFF page is re-encoded as a JPEG inside the PDF, and JPEG is lossy, so the PDF is never better than the TIFF — and 16-bit TIFFs are downsampled to 8-bit, so the extra depth is gone too. The quality slider (50–95%, default 85%) controls the trade-off: higher quality keeps more detail and makes a larger PDF. Keep the original TIFF if you need the smallest file or the full depth.

Each page becomes its own PDF page, in order — a 3-page scanned TIFF becomes a 3-page PDF. If you only want the first page, tick the first-page-only box before converting. In combined mode every page of every TIFF goes into the single PDF in list order; in per-file mode each TIFF becomes its own PDF with one page per TIFF page.

Usually smaller. Uncompressed TIFFs are huge — the PDF stores each page as a JPEG plus a small page wrapper, so it is typically much smaller than an uncompressed TIFF. A tightly-compressed TIFF of flat documents can still be smaller than the PDF, because JPEG has nothing to gain on flat areas. That is normal, not a defect: the tool shows the real size on each file instead of hiding it, and the quality slider controls the trade-off.

A 16-bit TIFF is downsampled to 8-bit, because JPEG only stores 8 bits per channel — the difference is imperceptible on a standard display, but the extra depth is gone, so keep the original if you need it. CMYK TIFFs are converted with a simple profile-free conversion rather than a colour-managed one, so colours can shift slightly; the tool tells you on the file card when it happened.

It is flattened, never preserved: PDF pages built from JPEGs have no transparency, so transparent pixels are filled with the background colour you pick — white by default, or black, or any colour you choose. Most TIFFs have no transparency at all, so this rarely applies; greyscale pages stay greyscale. The flattened first page is shown on each file card before you download, so there are no surprises.

Your choice. Combined puts every TIFF — every page of every TIFF, in list order — on its own page in a single PDF, the right pick for a set of scanned pages going to one form or email. Per-TIFF makes one PDF per TIFF, each named after its file, with a Download all as ZIP button for the whole batch.

Original makes each page exactly the size of its TIFF page (1 pixel = 1 point) — best when the PDF is read on screen and page size does not matter. A4 is the safe default for forms and printing in the UK and Europe; Letter matches US forms. Fit keeps the whole image on the page, never cropped and never upscaled; Fill covers the whole page, cropping the edges. Images are never upscaled in Fit mode.

Re-encoding drops metadata (EXIF, camera and scan settings) — keep the original if you need it. TIFF orientation tags are not applied, so a sideways scan stays sideways; rotate it in an editor first if that matters. The PDF carries only the pictures, on pages of the size you chose.

There is no daily limit and no account. A 25 MB safety cap applies per file, a 50 megapixel cap per image, and 20 files per batch, because decoding TIFFs and building PDFs in the browser is memory-heavy. Most scanned TIFFs are well under 25 MB, far below the cap.

No. Your TIFFs are decoded and built into the PDF entirely in your browser — your file data never leaves the device, and the only third-party requests are the site's own analytics, which count page views. You can verify it yourself with the network-request counter in the privacy section below the converter.