Compress Image to 20 KB
A 20 KB limit is one of the strictest you will run into, usually on government portals and application forms that were built for slow connections. PNGful compresses your image directly in your browser and tells you plainly whether 20 KB is achievable for your file. Nothing is uploaded, and there is no cost or sign-up.
Content last reviewed 2026-07-14.
Auto picks the most efficient format allowed. PNG is lossless, so small targets often need dimension reduction.
Metadata is removed so every byte of the budget goes to image data.
or drag & drop an image here, or paste from your clipboard
PNG, JPG, WebP, AVIF, GIF, BMP, TIFF, HEIC, SVG
Your images are processed on your device and are not uploaded to PNGful.
How it works
- 1
Add your image
Drop, pick or paste — the target is already set to 20 KB.
- 2
Let the search run
PNGful binary-searches encoder quality (and reduces dimensions if you allow it) until the result fits.
- 3
Review the result
Check the final size, quality and dimensions in the side-by-side view.
- 4
Download
Your file downloads at or under 20 KB whenever technically possible.
Common uses
- Signature images for job and exam application portals that cap uploads at 20 KB
- Tiny forum avatars where boards enforce small file sizes
- Images embedded in email signatures, where small files keep messages lightweight
- Government form photo fields with hard 10–20 KB limits
Good to know
- A detailed 20-megapixel photo cannot keep its full dimensions at 20 KB — PNGful will reduce dimensions if you allow it, or tell you the closest achievable size if you don't.
- Lossless PNG output almost never reaches 20 KB for photographs. Hitting this target for a photo usually requires converting to JPEG or WebP, which are lossy formats.
- At 20 KB, photos will show visible compression artifacts such as blockiness and soft edges. Simple graphics, signatures, and line art survive far better than photos.
- If your portal also enforces minimum pixel dimensions (for example 140×60 for a signature), the combination may be impossible for a complex image — no tool can change that.
Your images stay private
Your images are processed on your device and are not uploaded to PNGful.All processing happens locally using your browser's own image engine — there is no upload step, no server-side queue, and nothing to delete afterwards. Read more in our privacy policy.
Frequently asked questions
Why do some forms require images under 20 KB?
Very small limits usually come from systems designed for low-bandwidth users or from databases that store images inline. Government exam portals in particular often cap signature and photo uploads at 10–20 KB so millions of submissions stay manageable.
Can a photo really be compressed to 20 KB?
Yes, but not at full resolution. To reach 20 KB, PNGful typically needs to shrink the image to a few hundred pixels on the long edge and use JPEG or WebP compression. A signature or simple graphic can hit 20 KB with much less quality loss than a photograph.
Will my signature image still be legible at 20 KB?
Usually yes. Signatures are mostly flat color on a plain background, which compresses very efficiently. Scanning or photographing your signature against clean white paper before compressing gives the best result.
Should I use PNG or JPEG for a 20 KB target?
For signatures and line art, PNG at reduced dimensions often works and keeps edges crisp. For anything photographic, JPEG or WebP is effectively required — a lossless PNG of a photo will not get close to 20 KB.
Is my document photo uploaded to a server?
No. PNGful runs entirely in your browser, so your photo or signature never leaves your device. That matters when you are handling images destined for official applications.
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