When TIFF to JPG turns TIFF into JPG
Scanners and print shops hand you TIFF. Browsers, WhatsApp, and web forms want JPG.
What TIFF to JPG changes in the picture
The TIFF is drawn and saved as JPEG in the browser. Multi-page TIFF keeps the image the browser could read, not a stack of print pages with text.
JPEG cannot hold the print quality of a high-bit TIFF. Keep the TIFF for the printer and send the JPG to people.
When TIFF to JPG is the right page
TIFF to JPG sits on this site because TIFF and JPG are not interchangeable, even when they look similar in a file list. Scanners and print shops hand you TIFF. Browsers, WhatsApp, and web forms want JPG. Print shops and archives ask for TIFF. Everyone else usually wants JPG. Portals, printers, and chat apps that reject HEIC, WEBP, or AVIF are asking for JPG.
The TIFF is drawn and saved as JPEG in the browser. Multi-page TIFF keeps the image the browser could read, not a stack of print pages with text.
What you give up by leaving TIFF
TIFF is used for print and scanning. It can hold high quality and is clumsy in email and browsers. A TIFF made from a JPG cannot be sharper than that JPG, and it is larger.
Keep the print-shop TIFF. Send JPG when the reader is a browser or a phone.
What you gain, and do not gain, with JPG
The download has to be JPG, because that is the format the next step named. Portals, printers, and chat apps that reject HEIC, WEBP, or AVIF are asking for JPG. It is small and universal for photographs.
Convert once from the best original. A second lossy save only throws away more.
A test that matches the real file
Start from the question the other software asked. If it asked for JPG, TIFF to JPG is the matching page. If it asked for something else, switch tools instead of hoping a similar extension will pass. Scanners and print shops hand you TIFF. Browsers, WhatsApp, and web forms want JPG. The TIFF is drawn and saved as JPEG in the browser. Multi-page TIFF keeps the image the browser could read, not a stack of print pages with text. The limit is the part people skip, and it is the part that decides whether the download is usable. JPEG cannot hold the print quality of a high-bit TIFF. Keep the TIFF for the printer and send the JPG to people. The file stays in your browser and is not uploaded. The limit is 100 MB. Keep the original until the download has been opened in the program that will use it. Check three things in the download: it opens, the TIFF material you cared about is still there, and the file size or the layout is what the form described. A new extension alone is not those three things. If a portal, a teacher, or a client rejects the file, send them the original TIFF as well when you are allowed to. TIFF to JPG is a convenience copy. It is not a new master. Photos fail uploads for three separate reasons: the format name, the pixel size, and the kilobyte size. TIFF to JPG only does the TIFF to JPG step. If the form also prints a pixel size or a 20 KB or 50 KB cap, do that step with the matching tool, starting from the original each time. A second lossy save will not recover detail.
Here is the decision for TIFF to JPG. You start with TIFF and you stop when a real program accepts JPG. A high-quality scan can live in TIFF without JPEG damage, if it started that way. JPG is lossy. Saving it again softens fine detail. It cannot store transparency. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
JPEG cannot hold the print quality of a high-bit TIFF. Keep the TIFF for the printer and send the JPG to people.
A related step, if you still need one, is JPG to TIFF.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.