Compress PDF to 100 KB

How to compress a PDF below 100 KB

1. 1

   Choose a PDF

   Click Choose PDF or drag the file onto the page. The file stays on your device.

2. 2

   Click Compress PDF

   The 100 KB limit is already set, so there is nothing to type. If the PDF is already under 100 KB, you get it back unchanged.

3. 3

   Check the result

   You will see the size before and after. If the file cannot get down to 100 KB, the page tells you how much too big it is and shows the Try a lower resolution button.

4. 4

   Download the file

   Before the download we check that the smaller PDF opens, has the same number of pages and has not lost any text.

What fits in 100 KB

100 KB holds a few pages of ordinary text, such as a letter, a confirmation or a form filled in and saved from an editor. Scans are harder, because one colour page can be bigger than the whole limit, so you may need a lower resolution. If you scan the document yourself, choose black and white and attach only the pages the form asks for. Before sending, zoom in on the result and check that every detail is readable.

Where you will see a 100 KB limit

You will see a 100 KB limit on small attachments for online forms, applications and support requests. The limit is a ceiling, so the finished file usually comes out a little smaller than 100 KB. The tool counts 1 KB as 1,024 bytes and 1 MB as 1,024 KB. If the form counts differently, or you are not sure how it counts, set a custom limit with a small margin on the main Compress PDF page.

A short text document usually fits, but photos and scanned pages need far more space. The size of a PDF depends more on photos, scans and fonts than on the number of pages. A text-only document often fits with no visible change, while a scan may need its pages saved at lower quality. After downloading, compare important details, signatures, stamps and thin lines with the original.

What to do if the PDF will not fit in 100 KB

If the file cannot get below 100 KB, you can download the smallest version the tool managed to make and see how far over the limit it is. Then click Try a lower resolution. The file may get smaller still and the text stays selectable, but photos, stamps and thin lines will be less sharp, so look at the result before you send it.

If that is still not enough, cut down the document, not its readability. Use Delete PDF pages to drop pages the recipient does not need, keep only the required ones with Extract PDF pages, or Split PDF into several smaller files. If the recipient accepts bigger files, choose a higher limit in Compress PDF.

Privacy

All processing takes place in your browser. Your PDF is never uploaded to a server, and no data remains after you close the page.

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