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Tool guide
Weight limits show up everywhere: a government portal wants a scan under a couple hundred kilobytes, a mail server rejects the attachment, a product photo drags your LCP score down. Here you name the ceiling in kilobytes and the page searches for the quality setting that fits, optionally capping width, height or scale on the way. Every pass runs inside your own tab. See also: cut the pixel dimensions down first, switch the JPG to WebP to save bandwidth, strip EXIF and GPS tags from the file.
Load the file, type 200 into the target field and force JPEG, since many institutional forms still reject WebP. If the search drops quality below 50 and the text smears, add a Max W of about 1600 — cutting resolution costs less visible detail than crushing quality does.
Only PNG is truly lossless, and the saving there comes from re-encoding — usually 10 to 20 percent, no more. JPEG and WebP are lossy by design. The default quality of 78 is normally indistinguishable on screen, while anything under 60 starts showing blocking in flat areas and halos around lettering.
PNG stores pixels losslessly, so photographs compress badly in it and a re-encode can add bytes. If you do not need transparency, switch the format to JPEG or WebP and a photo will drop several times over. Only WebP and PNG keep an alpha channel; JPEG fills transparency with black.
The search bottoms out near quality 5 on the Quality ratio slider. If the file is still too big, the problem is pixel count: a 4000×3000 shot simply will not fit into 50 KB and still look like anything. Set Max W or Scale % to shrink the dimensions and the target usually becomes reachable.
Auto: WebP/JPEG is the sensible default — WebP is roughly a quarter smaller than JPEG at matching quality. Choose JPEG for email, older CMS uploads and anywhere .webp is refused. Keep PNG for screenshots, logos and anything with transparency. GIF and SVG are accepted as input, but the output is always raster: an animated GIF collapses to its first frame and an SVG is rasterised at the chosen size.
One per pass — there is no batch queue on the page. Settings persist between files though, so a run of similar product shots goes quickly: drop the next file in and press the download button. You only need the reset control when you want the defaults back.
No hard cap is coded in; tab memory is the real ceiling. The browser expands the picture into an uncompressed canvas, so a 50 megapixel shot occupies roughly 200 MB of RAM. Desktop browsers cope, a budget phone may reload the tab — start with Scale % there.
Before: scan.jpg — 3.4 MB, 4032×3024, the form refuses anything over 300 KB
After: Target 300 KB with Max W 1600 and JPEG output → 287 KB, the text stays legible
Before: product.png — 2.1 MB, 2000×2000, opaque background stored as PNG
After: The For web preset with Auto: WebP/JPEG and Max W 1200 → roughly 140 KB of WebP
Before: selfie.jpg — 5.8 MB straight off a phone camera
After: Scale 20% at quality 78 → about 90 KB and 806×605 pixels
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