Scanners still emit TIFF for a reason
A desktop scanner or a copier’s “high quality” mode often writes TIFF so you can OCR, reprint, or archive without generation loss. That file is the master. JPEG is the travel copy. Converting TIFF to JPG is how you share: Gmail caps, college portals, WhatsApp, and almost every “upload your document photo” form. You accept some softness in exchange for a file that moves.
Keep the TIFF if the scan still has a job to do. Once you only have JPEG, heavy crops and reprints pick up artifacts. A common workflow is: archive TIFF on a drive, mail JPEG, and never overwrite the TIFF with the JPEG.
Multi-page, bit depth, and compression inside TIFF
TIFF is a family. Some files are uncompressed RGB. Some are LZW or ZIP. Some are JPEG-in-TIFF. Some are 1-bit black-and-white at 600 DPI (great for text, enormous in pixels). Some are 16-bit. A browser decoder may not understand every flavor—Fax Group 4, unusual tiles, or 32-bit float. If a file fails, try opening it in Preview or IrfanView and re-saving a simpler TIFF, or export JPEG there.
Multi-page TIFFs (a 12-page contract in one file) are a scan-shop staple. A canvas converter typically gives you one image—the first page—not a ZIP of JPEGs. For full documents, a dedicated multi-page splitter or a PDF workflow is more appropriate. ToolPin PDF tools may be a better path if the goal is a shareable multi-page file rather than a photo.
1-bit text scans can look muddy as JPEG. JPEG is for continuous tone. If the TIFF is a contract, consider PDF (from the scanner or a PDF printer) instead of JPEG, or use a high JPEG quality and do not downsample below readable type. Color photos and magazines convert more happily.
Size and quality
A 300 DPI A4 color TIFF can be 25 MB; a decent JPEG of the same page is often 0.5–2 MB. That is the win. Do not crank JPEG to 100 on a text page—you spend bytes on noise. Around 75–85 is plenty for sharing. Resize if the TIFF is 5000 pixels wide and the form wants 2000.
Transparency is rare in scan TIFFs. If present, JPEG will flatten it.
Privacy on ToolPin
This is one of the more sensitive conversions people do: IDs, bank statements, medical records, exam papers. Processing is local. The TIFF is not sent to toolpin.online. 250 MB limit. No signup, no watermark. After you download, you may still want Strip Image Metadata on the JPEG if the scanner embedded a device serial or your name in tags—then delete the JPEG from Downloads when the portal is done.
Browser memory can choke on 600 DPI full-color A3. Try a desktop, close tabs, or downsample in the scanner software first.
After conversion
Compress JPG if needed. Rotate if the copier saved landscape pages as portrait with an orientation tag that a portal ignores. Do not convert TIFF → JPG → TIFF expecting to get the master back. And if you needed all pages, make a PDF instead of a pile of JPEGs unless the destination explicitly wants images.