TIFF is an archival format, not a sharing format
TIFF (Tagged Image File Format) dates back to 1986 and is still the default output of flatbed scanners, fax software, medical and GIS imaging systems, and older Photoshop workflows. It earned that role by storing images with no loss and enormous flexibility: layers, 16-bit color, multiple pages, dozens of compression schemes. The cost is size. A single scanned page routinely lands between 20 and 100 MB, and because browsers cannot display TIFF at all, the file is effectively unshareable: you cannot post it, preview it in chat, or attach it to most web forms. Converting to JPG keeps the picture and drops the baggage. If the file must stay pixel-perfect, use TIFF to PNG instead.
How this converter reads TIFF without a server
Since browsers ship no TIFF support, this page brings its own decoder: UTIF.js, the same pure-JavaScript TIFF library that powers the Photopea image editor. It loads once, runs entirely inside your browser, and parses the TIFF's tag structure and pixel data on your own device. Your scans, which are often medical records, contracts or ID documents, never touch a server, and you can confirm that by loading the page and then disconnecting from the internet before converting. Once decoded, the pixels are re-encoded as JPG by the browser itself. For photos coming from an iPhone rather than a scanner, the HEIC to JPG tool does the equivalent job.
Common questions
Why can't my browser or phone open TIFF files?+−
No mainstream browser can display TIFF: Chrome, Firefox and Edge simply do not ship a TIFF decoder, and most phones cannot preview it either. TIFF was designed for print, scanning and archival workflows, not the web. Converting to JPG turns the file into something every browser, phone, email client and upload form accepts.
My TIFF has multiple pages. What happens to them?+−
This tool converts the first page only. Multi-page TIFFs, common from scanners and fax software, store each page as a separate image inside one file, and a single JPG can only hold one image. If you need every page of a scanned document in one file, a PDF is the right container for that job.
How much smaller will the JPG be?+−
Usually dramatically smaller. TIFF files are often stored uncompressed or with weak lossless compression, so a single scan commonly weighs 20 to 100 MB or more. JPG re-encodes the same pixels with efficient lossy compression, and at the default 90% quality the result is typically a small fraction of the original size while looking identical in normal viewing.
Does converting TIFF to JPG lose quality?+−
JPG is lossy, so some information is discarded, but at 90% quality the difference is invisible for photos and most scans. Keep the original TIFF if it is your archival master. For line art, text-heavy documents or anything you will keep editing, convert to PNG instead, which is lossless and avoids compression artifacts around sharp edges.