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Tool guide
PNG stores every pixel losslessly and supports an alpha channel, which is why a 3000 px screenshot can weigh 5 MB. JPG drops some of that detail and hands you the same frame ten times lighter, but it has no transparency: anything see-through becomes solid background. Government portals, HR application forms, bank upload widgets and photo print services routinely demand exactly that, refusing PNG outright. The conversion is done by your browser's Canvas engine, so nothing is sent to a server. See also: get a lighter WebP instead of a JPG, push the JPG under an upload limit, wipe EXIF and GPS tags from the photo.
JPEG has no alpha channel, so transparent regions are filled with the Canvas backdrop colour. Soft shadows and feathered edges blend into that fill and cannot be separated again. If the logo has to sit on varying backgrounds, keep the PNG and treat the JPG as a one-off export.
Convert the PNG to JPG first - a 4-5 MB scan usually lands at 0.5-1 MB, which clears most caps. If it is still too large, resize the long edge down to 1600-2000 px with the resize tool; that keeps document text legible for a human reviewer.
There is a JPG to PNG converter here, but it cannot restore what was thrown away. PNG will losslessly wrap the existing JPEG artefacts and produce a bigger file, and the transparency stays gone. Keep the PNG master and regard each JPG as disposable.
JPEG compresses in 8x8 pixel blocks and is tuned for smooth photographic gradients. A hard edge between black type and a white field is the worst case, so grey ringing appears around glyphs. Keep UI screenshots, diagrams and tables as PNG; use JPG for photographs.
Not as input - the picker is limited to image/png. The output is a standard JPEG with a .jpg extension, and renaming it to .jpeg changes nothing about the bytes. For the opposite direction, use the separate JPG to PNG page.
Yes, in mobile Chrome and Safari, and the file picker opens your gallery or file manager. The limit is memory: an 8000 px PNG may not fit into a mobile Canvas and the tab can reload. When that happens, convert from a desktop instead.
The scan never leaves the tab: it is read locally, painted into a Canvas and written back to your disk, with no request carrying the image. You can verify it yourself - open the Network panel in devtools and watch that nothing is sent during export.
Before: passport-scan.png - 4.8 MB, but the form caps JPG at 2 MB
After: passport-scan.jpg - 690 KB, same resolution, accepted by the form
Before: logo.png - transparent backdrop, 512x512 px
After: logo.jpg - 512x512 px, transparency replaced by a solid fill
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