Resize image to 20 KBの使い方
- 1
Add the image
Drop or choose a JPG, PNG, WebP or HEIC picture; a photo straight from an iPhone or Android camera is fine.
- 2
Crop if you want to
Drag the box to keep only what the form needs, such as your face or one page, which leaves more of the 20 KB for detail.
- 3
Adjust the target
The maximum starts at 20 KB. Add a minimum if your form has one, or type a width and height when it also fixes the pixels.
- 4
Download
Check the size in KB and bytes on the result card, then save the JPEG; its name ends in -20kb.jpg.
制限と Pro
Free: one image at a time up to 25 MB; the output is a JPEG of up to 4,096 px on its longest side.
With Pro, the picture you start from may be as large as 4 GB. Pro を見る
Resize image to 20 KB について
Twenty kilobytes is a common ceiling on scholarship, admission and recruitment forms, and it is tight: a phone photo is usually 2 to 5 MB, a hundred to two hundred and fifty times more. This page gets a picture under that ceiling with the least visible damage. It first keeps your crop at full resolution and searches the JPEG quality down to 60; if the file is still too heavy, it shrinks the pixel dimensions step by step, keeping the aspect ratio, and searches again, so you get the largest picture that fits rather than a tiny or blocky one.
The output is a baseline JPEG with no camera data, GPS location or thumbnail left in it, which also saves bytes. The result card shows the pixel size it chose, the size in KB (1 KB = 1,024 bytes) and the exact byte count; the file is kept under 20,000 bytes too, for forms that count a kilobyte as 1,000 bytes.
If the form also fixes the pixel size, type the width and height: the crop locks to that shape and only the quality changes. A detailed photo at a large fixed size may not fit at all, and the page will say so rather than quietly shrinking it. Transparent PNGs get a white background, since JPEG has no transparency. For an exam with its own photo and signature rules, the photo and signature resizer has presets.
プライバシー
The image is decoded, cropped, resampled and encoded inside this browser tab, with the repeated JPEG encodes running in a Web Worker; it is never uploaded or stored on a server. The encoder and resampler are downloaded from this site only after you add a picture (HEIC files also fetch the libheif decoder from jsDelivr, without your image). The target you type is remembered in local storage.