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Resize image to 100 KB

100 KB is the usual ceiling for a scanned certificate, mark sheet, ID card or a larger photograph uploaded as a single image. This tool keeps as many pixels as the limit allows and, for scans of text, can save a grayscale JPG so the letters stay crisp.

Resize settings

Photo · Choose what your form needs

Choose a sizeMatch the file size shown on your application form.

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Your outputJPG · under 100 KB

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JPG · under 100 KBChange size

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Scans of certificates and ID under 100 KB

  1. Scan or photograph at 150 to 200 DPI. An A4 page at 200 DPI is about 1650 by 2340 pixels: enough to read, small enough to compress. 300 DPI and above only forces a harder squeeze.
  2. One document per file. Crop away the desk, the fingers and the margins before compressing; every pixel of table costs bytes that the text needs.
  3. Tick “Black and white scan” for black text on paper. Colour information is dropped, so the same 100 KB carries sharper letters. Leave it off for a colour photo, a stamp whose colour matters or an ID card.
  4. Zoom into the After preview. If the smallest print is unreadable, use Change to type a minimum of 50 KB so the tool aims for the top of the window, or scan the page again with less background.

Keeping printed text readable after compression

JPG was made for photographs, and text is its hardest case: sharp black edges on white turn into ringing when the quality drops. Two things help more than anything else. First, pixels: a page that is 1200 pixels wide survives a low quality setting better than an 800-pixel page at a high one, so SizePrep lowers quality before it lowers dimensions. Second, colour: a scan with a colour cast wastes bytes on the cast, which is why the grayscale option exists here and nowhere else on the site. Photos of a screen, shadows from a phone held over the page and crumpled paper all add noise that eats the budget.

Photographs at 100 KB

A 12-megapixel phone photo is several megabytes. Under 100 KB it keeps roughly 1000 to 1400 pixels on the long side at good quality, which is more than most portals display. Give a width or height if the form states a maximum; give both for an exact size and SizePrep crops to that shape from the centre (you can move the crop) rather than stretching. Faces are never retouched.

Several pages in one upload

A form that asks for a multi-page document usually wants a PDF, not an image. Each page can be prepared here as a separate JPG; a PDF tool is planned. Until then, keep each page under the limit and check whether the portal accepts one file per page.