Compress PDF to 20 KB
For the strictest upload limits: one short page at a time.. To compress a PDF to 20 KB, open the tool below, keep 20 KB selected and add your file. A 20 KB budget fits a text-only page or one low-resolution scan, so remove extra pages first. If the result is still too big, split the PDF and upload pages separately.
Drop your PDF here
Choose one document to make lighter and easier to share.
Select PDF files
or drop PDF files here
Single file · Max 256 MB
Core processing stays in this browser after the page loads. Large files use device memory and may run slower.
How do I compress a PDF to 20 KB?
To compress a PDF to 20 KB, open the tool below, keep 20 KB selected and add your file. A 20 KB budget fits a text-only page or one low-resolution scan, so remove extra pages first. If the result is still too big, split the PDF and upload pages separately.
What fits in 20 KB
Twenty kilobytes is very small. A page of typed text with standard fonts usually fits comfortably, but a scanned page has to be turned into a low-resolution image to get anywhere near it. In our tests a scanned page needed about 22 KB even at reduced resolution, so expect one scanned page at most, and check that small print is still readable.
How to compress a PDF to 20 KB
- 01
Add your PDF
Drop the file into the tool above. 20 KB is already selected as the target.
- 02
Compress
The tool tries structure optimization, then photo re-encoding, and only turns pages into images if nothing else fits.
- 03
Check the result
The notice tells you whether the target was reached and which method was used. Zoom in to check that small print is readable.
- 04
Download
Save the compressed copy. Your original file is not changed.
When you need a PDF under 20 KB
Signature or declaration pages
Forms that ask for a single signed page often set the lowest limits. Upload just that page.
One-page certificates
Export only the page you need, then compress it, rather than shrinking a whole document.
If it still will not fit
- Remove pages you do not need to upload: blank pages, instructions, duplicates.
- Split the PDF and upload the parts separately if the form allows it.
- Ask whether the form accepts a larger file, or a JPG instead of a PDF.
- Read how to reduce a PDF for an upload limit for more options.
What we measured
Results from our own test files in Chrome on 5 October 2026. Your results depend on what your PDF contains: photos and scans shrink most, typed text is already small.
| Test document | Original | Target | Result | Method |
|---|---|---|---|---|
| 3-page scanned document (one photo per page) | 998 KB | 100 KB | 66.5 KB | Pages turned into images |
| Document with large embedded photos | 1.33 MB | 200 KB | 174.7 KB | Photos re-encoded; text still selectable |
Questions about compressing to 20 KB
Can a multi-page scan really fit in 20 KB?
Usually not while staying readable. Split the PDF, upload only the required page, or ask whether the form accepts a larger file. The tool tells you when the smallest version it can make is still above 20 KB.
Why does my 20 KB result look blurry?
To reach 20 KB with a scanned page, the page is stored as a small, heavily compressed image. Zoom in before uploading and check that names, numbers and stamps are legible.
Is my PDF uploaded to a server?
No. The compression runs in your browser after the page loads, and the file stays on your device. You can check this in your browser’s Network tab while the tool runs.
Is there a limit on how many PDFs I can compress?
No. There is no account, no daily limit and no watermark.
Need a different size?
Or use Compress PDF to choose a quality level instead
Verify it yourself
Your file is not uploaded. Here is how to check.
The core tools run inside your browser tab, so a document you open here is not sent to FreePDFKit or to anyone else. You can confirm that in about a minute.
- Step 1
Open the tool and let it load
Wait until the page has finished loading.
- Step 2
Open your browser’s developer tools
Press F12 (or Cmd+Option+I on a Mac) and switch to the Network tab.
- Step 3
Run the tool on a test file
Choose a non-sensitive file of the type the tool accepts and process it as usual.
- Step 4
Look for a request that carries the file
You will not find one. The page loads its own scripts, then the work happens in your browser.
What backs this up
- Open-source libraries in the page. PDF handling uses libraries such as pdf-lib and Mozilla’s PDF.js, which run in your browser.
- No PDF endpoint on the server. The only server routes are the contact form and the social-preview image generator.
- A restrictive security policy. The site’s Content-Security-Policy limits the fetch and XHR connections page scripts can make to our own origin and Cloudflare’s anti-spam check, plus Google Analytics, which receives page views only.
Step-by-step checks, including an offline test, in how to check if a PDF tool uploads your file. More detail in the privacy policy and how this compares with other no-upload options.