How to resize a photo to 20 KB and keep the face clear
By the PdfDady team · Updated · 7 min read
To get a photo under 20 KB and still have a recognisable face, make the picture smaller in pixels first, then let the JPG quality drop only as much as it has to. A 4000 × 3000 phone photo squeezed to 20 KB looks like wet newspaper. The same photo cut down to a few hundred pixels across usually fits in 20 KB and looks sharp at the size a portal shows it.
Our Resize Image to 20 KB page does exactly this. It opens with a 20 KB limit already set, shows the final size in KB and pixels, and runs in your browser, so the photo is not uploaded anywhere.
Why 20 KB is hard, and how to make it easy
A fresh photo from a phone camera is often 2 to 5 MB. Getting it to 20 KB means throwing away more than 99% of the data. There are only two ways to do that:
- Fewer pixels. Halving the width and height leaves a quarter of the pixels, so the file shrinks a lot without any loss of sharpness at small sizes.
- Lower JPG quality. This keeps every pixel but stores each one more roughly. Pushed too far, you get blocky patches around the eyes and a halo along the hairline.
Most blurry 20 KB photos are the result of leaving the pixel size huge and crushing the quality. The fix is to do the opposite. And in most cases the form already tells you the pixel size it wants, which settles the question for you.
Steps to get a photo under 20 KB
- Crop to head and shoulders first. If you are starting from a full-length or group photo, crop it tightly before resizing. Every pixel of wall or background you keep eats into the 20 KB.
- Open Resize Image to 20 KB and add the photo. JPG, PNG, WebP and iPhone HEIC are accepted, up to 25 MB and 50 megapixels.
- Type the dimensions from your notice, if it gives any. Enter width and height in pixels, or in cm, mm or inches. If the notice only gives a KB limit, you can leave the size empty and the tool will reduce the pixel size by itself when that's needed to reach 20 KB.
- Read the result. The tool lowers the JPG quality step by step until the file fits, then shows the exact KB and pixel size.
- Zoom in before you download. Look at the eyes and the edge of the hair. If they look smeary, try a smaller pixel size rather than accepting a very low quality.
- Download. The file is saved as a JPG named after its pixel size, such as
resized-200x230.jpg.
The 20 KB is counted as 20,000 bytes. A file that passes here will also pass a portal that counts 1 KB as 1,024 bytes.
What size the form wants
Don't pick 20 KB because a friend used it. Each recruiting body sets its own figures, and they change from one notice to the next. Two real examples from 2026 show how different they can be:
| Notice | What it asks for |
|---|---|
| IBPS CRP PO/MT-XVI (2026) | Photo 200 × 230 pixels (preferred), file between 20 KB and 50 KB. Signature 140 × 60 pixels (preferred), file between 10 KB and 20 KB |
| SSC CHSL 2026 | Photo is captured live by the application module, not uploaded from your gallery. Signature JPEG, 10 to 20 KB, about 6.0 cm wide × 2.0 cm high |
Notice something about the IBPS photo: 20 KB is the minimum, not the maximum. If you upload a 15 KB photo there, it fails, even though it is "under 20 KB". Read whether your form gives a range or just an upper limit before you start.
For the signature, which is where 20 KB limits most often apply, our Signature Resizer is a better starting point. It also trims the blank paper around your signature and whitens the background, which saves bytes and looks cleaner. There's more on that in our guide to signature size for online forms.
Keeping the face clear at small sizes
A few habits make a bigger difference than any setting:
- Start from a well-lit photo. Shadows and grain are detail too, and the compressor spends bytes trying to keep them. A face photographed facing a window compresses more cleanly than one under a yellow bulb at night.
- Use a plain, light background. A bookshelf or a patterned curtain behind you costs far more bytes than a white wall. Many notices ask for a light background anyway.
- Don't resize the same JPG again and again. Each save loses a little more. Go back to the original photo whenever you need a new size.
- Don't upscale. If someone sends you a tiny WhatsApp-forwarded photo, making it bigger in pixels will not add detail. Retake it if you can.
- Avoid filters and beauty modes. Smoothed skin and boosted colour don't help compression, and portals that compare your photo with your face on exam day won't thank you for them.
When the upload still gets rejected
"File size should be between 20 KB and 50 KB." Your file is too small. The tool does not pad a file to make it bigger, so raise the pixel size a little or switch to a 50 KB maximum, then check the KB shown again. Our 50 KB guide covers this case.
"Invalid dimensions" even though the KB is fine. The portal checks pixels as well. Set the exact width and height from the notice. If the shape differs from your photo, unlock Keep proportions in the Image Resizer and use Crop & position to choose what stays in the frame. The photo is cropped, never stretched.
"20 KB can't be reached." If you fixed exact pixel dimensions and the tool says it can't reach the target at an acceptable quality, it is telling you the truth instead of silently wrecking the picture. Crop the photo tighter, use a plainer background, or check whether the notice allows slightly smaller dimensions.
"Only JPG/JPEG allowed." A KB target always produces a JPG here, so a PNG or HEIC you started with comes out as a JPG. Transparent parts of a PNG become white.
The photo is fine but it still won't upload. Try another browser, or check whether the portal wants a particular file name. Some do. The tool names the file by its pixel size, so rename it if needed.
Questions people ask
Can I get any photo under 20 KB?
Almost any photo can be made 20 KB or smaller if you let the pixel size come down. Whether it still looks good depends on how many pixels you need to keep. A passport-style crop at a few hundred pixels across is comfortable. A large landscape-shaped photo with lots of detail is not.
Should I use 20 KB if the form says "maximum 50 KB"?
No. Use the limit the form gives. A larger limit lets the tool keep a higher quality, so the photo looks better. Going smaller than you need only costs you sharpness.
Does PdfDady know my exam's photo size?
No. The tool doesn't hold any exam's requirements, because they differ by exam and year. Take the numbers from your notification and type them in.
Is my photo uploaded to your server?
No. The resizing happens in your browser and the photo stays on your phone or computer. The downloaded JPG also leaves out location data from the original.