Compress a PDF to 50 KB

Delete every page you don't need, add the PDF and run it. A short typed document may fit in text-safe mode. A scanned page is re-rendered as an image, and the compressor searches resolution and JPEG quality for the best result under 50 KB. 50 KB is realistic for one page and rarely works for more than two.

1. 01Remove extra pages first; each page costs bytes.
2. 02Add the PDF; the 50 KB target is set.
3. 03Check the size and zoom in on the smallest text.
4. 04If it can't reach 50 KB, use the suggested size or split the file.

The compressor won't go below about 60 dpi, the point where normal body text on an A4 or Letter page is still legible. A clean, single scanned page in grayscale often fits under 50 KB at that level; a colour photo of a page with shadows and a desk behind it often does not. When the target can't be reached without making text unreadable, it says so instead of handing you a blurry file.

Most of a scan's size is the image, so making the image simpler matters more than any setting.

• Scan or save in grayscale if the form allows it.
• Crop the scan to the paper's edges before making the PDF.
• Delete blank pages and instruction pages the form doesn't need.
• Split a long document into separate uploads if the portal allows it.

This page aims at 50,000 bytes or less. Upload forms disagree on what 50 KB means: some count 50,000 bytes, others 51,200 (1 KB = 1,024 bytes). A file of 50,000 bytes or less passes either rule, so you can type the limit exactly as the form writes it. The result shows the exact byte count. Windows File Explorer counts in 1,024s, so the same file can read slightly smaller there.