Compress a PDF to 20 KB
For the strictest upload limits: best for a single page.
Processed in your browser. Nothing is uploaded.
How to compress a PDF to 20 KB
- 1
Choose your PDF, ideally just the one page the form asks for.
- 2
Keep 20 KB selected and switch on “Allow black & white”.
- 3
Tap “Compress to 20 KB” and check the readability preview.
- 4
Download the file marked “Under 20 KB ✓”.
The tightest limit there is
20 KB is about the size of a short email with a small logo, so it’s a tough target for any PDF. It appears on forms that expect a single small item, such as a signature sheet, a photo page or a one-page declaration. Getting there is possible, but it pays to set realistic expectations.
Reduce PDF size to 20 KB, or get a PDF under 20 KB.
What fits in 20 KB
- A one-page text PDF from a word processor usually fits with no quality loss at all.
- A one-page scan can fit when it is simple, like a typed letter or a form with a few handwritten fields, especially in black & white.
- Multi-page scans rarely fit while staying readable. Upload pages separately if the form allows, or remove every page that isn’t required.
Tips for hitting 20 KB
- Switch on Allow black & white. Dropping colour is the single biggest saving.
- Crop or rescan with plenty of contrast: dark ink on white paper compresses far better than grey, shadowy phone photos.
- Use Delete pages or Extract pages first so only the page the form needs is left.
Check it’s still readable
At this size, Atifo lowers resolution step by step and stops at the smallest setting where normal text stays legible. Use the comparison slider and the 2× zoom on the result screen to read the key details, like names, dates and numbers, before you submit.
Other target sizes
Compress PDF to 50 KB · Compress PDF to 100 KB · Compress PDF to 150 KB · Compress PDF to 200 KB · Compress PDF to 300 KB · Compress PDF to 500 KB · Compress PDF to 1 MB · Compress PDF to 2 MB
Frequently asked questions
Can a multi-page PDF really fit in 20 KB?
Usually only if it is plain text. A scanned page alone often needs 20 KB at a readable quality, so for scans, upload one page at a time or remove extra pages first.
Why does “Allow black & white” help so much?
Colour information takes up a large share of an image. Removing it can cut the size by a third or more, which is often the difference between 26 KB and 18 KB.
Will a 20 KB PDF still be readable?
Normal-size text stays readable, but fine print and photos get soft. Use the before/after comparison with Zoom to check before you submit.
What if Atifo can’t reach 20 KB?
You’ll get the smallest version that is still readable, with its exact size, plus suggestions: split the PDF, delete pages, or switch on black & white.