How to compress an image to 20 KB
- Tap Choose image and pick your photo (JPG, PNG, WebP or iPhone HEIC).
- Check the target says 20 KB. Change it if your form asks for a different limit.
- Tap Compress image. The yellow tag shows the final size.
- Tap Download image and upload the file to your form.
When you need a 20 KB image
Many recruitment and exam portals ask for a photo or signature between 10 and 20 KB. At this size, a passport-style photo (about 3.5 × 4.5 cm) still looks clear because it has few pixels. If your photo comes straight from a phone camera, crop it to your face and shoulders first with the passport photo maker, then compress.
Why portals ask for a size in KB
Government, exam and job portals store millions of uploads, so they cap each file to keep storage and page loads small. The limit is usually written like "JPG, 20–50 KB" or "maximum 100 KB". A modern phone photo is 2–5 MB, which is 40 to 250 times larger than most limits.
File size depends on two things: the pixel dimensions and the compression quality. ResizeKB first lowers JPG quality in small steps until the file fits, because that keeps the full picture sharp. Only when quality alone can't reach your target does it also reduce the width and height, and it tells you when that happens.
What if the portal has a minimum size too?
Some forms say "between 20 KB and 50 KB". Set the target to the maximum (50 KB). The result usually lands just below it, well above the minimum. If a tiny image comes out under the minimum, use the image resizer to make it larger first, then compress again.
Is it safe to upload my photo?
Your image is never uploaded. ResizeKB processes files inside your own browser using the same technology that draws images on web pages, so the photo never leaves your phone or computer. That matters for documents like passport photos, ID scans and signatures. You can even disconnect from the internet after the page loads and the tool keeps working.
Frequently asked questions
Will my photo look blurry at 20 KB?
At 20 KB some softness is normal for a full-size photo, so the tool also reduces dimensions when needed. For passport-style photos around 350 × 450 px, 20 KB still looks clear.
Does it work on mobile?
Yes. It works in Chrome, Safari, Samsung Internet and Firefox on Android and iPhone, with no app to install.
Can I compress a PNG?
Yes. PNG files are converted to JPG during compression, because JPG gets far smaller at the same visual quality. Most forms that ask for a KB limit accept JPG.
Is there a limit on how many photos I can compress?
No. The tool is free and unlimited, and there is no account or watermark.
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Last updated 2026-10-27