Resize image to 50 KBの使い方
- 1
Choose the picture
Pick a photo, screenshot or scanned page in JPG, PNG, WebP or HEIC format from your computer or phone.
- 2
Trim the edges
Move the crop box in to drop empty table, floor or margin around the subject; you can also rotate a sideways scan.
- 3
Set the limits
The maximum is 50 KB. If the form says something like 20–50 KB, type 20 as the minimum; add a width and height only if it requires exact pixels.
- 4
Save the JPEG
When the checklist shows the KB inside your range, download the file; the name ends in -50kb.jpg.
制限と Pro
Free: one image at a time, source files up to 25 MB; output JPEGs up to 4,096 px on the longest side.
Pro lifts the source file size limit to 4 GB. Pro を見る
Resize image to 50 KB について
Fifty kilobytes is the cap on many photo fields, from bank and railway recruitment to university admission forms, and on plenty of document uploads such as a scanned ID card or a caste certificate saved as an image. At 50 KB a portrait can stay reasonably sharp at several hundred pixels across, so the aim here is to keep as much resolution as the limit allows rather than shrinking blindly.
The page encodes your crop as a baseline JPEG at decreasing qualities until it is under the limit. If even quality 60 is too big, it reduces the width and height together and tries again, so the picture keeps its shape. When the form also has a minimum, say 20 KB, the search stops inside that window; a very plain image that stays below the minimum even at full quality is reported as such instead of being padded with junk bytes. Optionally, type a DPI and it is written into the file, for forms that check it.
The result card shows the chosen pixel size, the size in KB using 1,024-byte kilobytes, and the exact byte count, which stays under 50,000 so forms counting 1,000-byte kilobytes accept it as well. The file has no EXIF data, so the camera model and GPS position in the original are not passed on.
It doesn't make PDFs, and it can't make text in a blurry scan readable again; rescanning at a higher resolution is the fix there.
プライバシー
Everything happens on your device: the browser decodes the picture, a WebAssembly resampler scales it and a Web Worker runs the MozJPEG encoder for each size attempt. No upload takes place and nothing is kept after you close the tab, except the limits you typed, which local storage remembers. HEIC photos fetch the libheif decoder from jsDelivr, a request that contains no image data.