Comparisons5 min read
TinyPNG Alternative: When Browser-Only Wins
A TinyPNG alternative that never uploads your files: what pixeltools' compressor does, where TinyPNG still wins, and the real limits of each.
Compress image to 20KB
Shrink a photo or signature to 20 KB or less. Free, instant, and private. Nothing is uploaded.
Drop images here, click to browse, or paste
Supports JPG, PNG, WebP, HEIC, and GIF — up to 50 MB each
Why use PixelTools to compress image to 20KB
Lands under 20 KB, not near it
We test several quality levels and keep the best one that is at or under 20 KB (20 x 1024 bytes), so the portal's checker never sees 20.4 KB.
Built for signatures and small photos
20 KB is tight. A plain signature on white usually fits easily, while a full photo needs its pixel size reduced as well. The tool does both for you.
Tells you when 20 KB is too small
If an image cannot reach 20 KB even at the smallest size we try, you get a clear warning and the smallest version we could make, instead of a silent failure.
Private by design
Your ID photo or signature never leaves your device. The compression runs in your browser tab.
Three steps to a 20 KB image
- 1
Drop your image
Drag in a JPG, PNG, WebP or HEIC photo, or click to browse. The 20 KB limit is already selected.
- 2
Wait a second
The tool searches for the best quality that fits under 20 KB. Large photos take a few seconds.
- 3
Check the size and download
The result shows the exact file size next to the original. Download it and upload it to the form.
When you need an image under 20 KB
Upload forms check file size before anything else. Here is where this limit usually comes up.
Signature uploads
Application forms often ask for a scanned signature at a very small size. A signature is mostly white space, so it compresses far better than a photo.
Small passport-style photos
A face photo at 20 KB needs a small pixel size, roughly a couple of hundred pixels wide. Crop the photo first so none of the budget is spent on background.
Thumbnails and avatars
Profile pictures for internal tools and forums are often capped at tens of KB. 20 KB covers most of them.
Frequently asked questions
How do I compress an image to 20KB?
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Drop the image on this page. The 20 KB limit is already set, so the tool starts right away and shows the final size. Download the result when it says it fits.
Why is my photo still above 20KB?
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A large, detailed photo cannot reach 20 KB by quality alone. Crop it first, or resize it to a smaller pixel size, then run it again. The tool already shrinks dimensions as a last step, so a warning means even that was not enough.
Is 20KB the same as 20,000 bytes?
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Here 1 KB is 1,024 bytes, which is how most upload forms and operating systems count. So the limit is 20,480 bytes.
Will a signature stay readable at 20KB?
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Usually yes. Signatures are high contrast on a plain background, so they survive heavy compression. Zoom in on the preview before you upload to be sure the strokes are still clear.
How does the compressor reach the size?
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The compressor re-encodes your image as JPEG or WebP and searches for the highest quality that still fits under 20 KB. If quality alone would have to drop too far to get there, it also shrinks the pixel dimensions a little. All of it runs in your browser, so nothing is uploaded.
From the blog
Guides8 min read
The Complete Guide to Image Compression
How JPEG, PNG, WebP, AVIF, and GIF compression actually work, plus a practical guide to picking quality settings without visible loss.
Guides5 min read
Why Converting PNG to JPG Makes It Bigger
Why converting PNG to JPG sometimes increases file size instead of shrinking it, and how to pick the right format or tool for the image you actually have.
Image Formats5 min read
AVIF vs WebP vs JPG: Best Format for 2026?
AVIF, WebP, and JPG all compress differently and suit different use cases. Here's a direct comparison to help you pick the right format for your images.
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