Guide · 2 min read
How to reduce a photo to 100 KB (or whatever size you need)
Application forms often want photos under 100 or 200 KB. Here is how to get there without losing sharpness and without uploading the photo anywhere.
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Government forms, job sites and university portals often cap photo uploads at 50 KB, 100 KB or 200 KB. A photo from a phone weighs 2 to 6 MB, so it needs to shrink twenty to a hundred times. It takes a minute, and the photo keeps the sharpness that matters.
The quick way
- Open Compress image.
- Choose By maximum size and type the limit, for example
100 KB. - Drop the photo.
The tool tries different qualities and keeps the highest one that meets the limit. If even the lowest quality is not enough, it also reduces the image dimensions and tells you so. It all happens in your browser: the photo is never uploaded, which matters when it is a picture of your passport or your face.
What is going on underneath
A photo’s file size depends on two things:
- How many pixels it has. A 12-megapixel phone photo is 4,032 × 3,024 pixels. A form that displays it 300 pixels wide does not need even 1% of them.
- How hard each pixel is compressed. JPG throws away detail the eye barely notices. The lower the quality, the more it throws away and the smaller the file.
For very small limits, the most effective approach combines both: reduce the dimensions first, then the quality. An ID-style photo at 600 pixels wide and quality 80 usually comes in under 100 KB with no visible difference on screen.
If the form also asks for dimensions
Some forms want a file size and dimensions together, for example “JPG, 240 × 320 pixels, under 50 KB”. In that case:
- Use Resize image with By dimensions and enter the width and height.
- Run the result through Compress image with the size limit.
If the original photo has a different shape from the one requested, crop it first in your phone’s editor: the resize tool never distorts an image, it fits it inside the dimensions.
Common mistakes
- Taking a screenshot of the photo. It does make the file smaller, but it also lowers quality and adds borders or system bars.
- Dropping quality to the minimum. Below 40, visible blocks appear around faces and text. Reducing the dimensions is the better option.
- Sending a PNG. PNG has no lossy compression and is usually much larger. If the form accepts JPG, convert it.
- Uploading it to the first site the search engine shows. For a document photo, that means handing it to a stranger. Here it never leaves your device.
A privacy detail people tend to miss
Phone photos carry metadata: the GPS location where they were taken, the phone model and the exact time. When this tool compresses a photo, the image is generated afresh and that data disappears. If you ever need to clean a photo without changing its size, use Strip metadata.