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Under 100 KB · runs in your browser
Direct answer: Add your PDF and download the result. The tool shows the actual size it produced, so you know whether it is under 100 KB before you upload it anywhere. Whether 100 KB is realistic depends on the page count and what is on the pages: the budget table below shows how many KB each page gets.
Direct answer
Add your PDF and download the result. The tool shows the actual size it produced, so you know whether it is under 100 KB before you upload it anywhere. Whether 100 KB is realistic depends on the page count and what is on the pages: the budget table below shows how many KB each page gets.
Supports PDF documents, Scanned pages, JPG, and PNG files. Processed 100% locally in your browser.
Upload a document to begin instant client-side compression.
Target size: Under 100 KB (Maximum Compression)
Shows the real output size and a KB-per-page budget up front, so you can tell before uploading whether 100 KB is realistic for your document, and offers a flatten option when it is not.
The cap covers the whole file, so every page shares it. This is the average budget per page; a page of plain text needs far less than a scanned page or a page with a photo.
| Pages in the PDF | Average KB per page |
|---|---|
| 1 | 100 KB |
| 2 | 50 KB |
| 3 | 33 KB |
| 5 | 20 KB |
| 10 | 10.0 KB |
| 20 | 5.0 KB |
Add your PDF above, keep the "Under 100 KB" preset, and press Optimize File. The tool shows the size of the file it produced and whether it met the target. Download it only after that size is under 100 KB.
First remove pages you do not need with the page-range option. If the PDF has large embedded images, turn on "Flatten pages to images" and compress again; each page is rebuilt as an image, so the text is no longer selectable. If it still misses 100 KB, the pages are too detailed for that cap at a readable quality, so compress separate documents separately or use the next size up if the form allows it.
For a normal text-based PDF the tool keeps the text and only repacks the file. A scanned PDF, or any PDF compressed with "Flatten pages to images" on, is rebuilt from page images, so its text cannot be selected or searched.
No. The compression runs in your browser, and the file is not sent to usecos.app. Check your organization’s rules before using any web tool on highly sensitive documents.
The tool counts 1 KB as 1,024 bytes, as browsers and Windows do. macOS Finder counts 1 KB as 1,000 bytes, so a file just under the cap here can display as slightly larger there. If your form is strict, leave a margin or use the next smaller size.
No. The downloaded PDF contains your pages only.
Many job, exam and government upload forms set a hard size cap. The cap differs by form and can change, so use the limit shown on the form you are filling in, not a number from a website.
These pages target exact file-size problems from application, exam, job, visa, and document-upload workflows. UseCOS resizes and compresses files locally, but it cannot guarantee acceptance by SSC, UPSC, NTA, IBPS, RRB, IRCC, USCIS, university, employer, or other portals because upload rules can change by notice, country, form, file type, and submission year. The per-page table is simple arithmetic (the size cap divided by the page count), not a measured result for your file; the tool reports the real output size.
Maintained by usecos.app Research & Engineering.