Aivoryx PDF Tools

Compress PDF to 100KB — Free & Online

A 100KB cap is a common, specific requirement — government form portals, exam registration systems, and job application uploaders often enforce it, usually for a scanned ID, signature, or certificate page. Rather than manually guessing a quality setting and re-compressing over and over, this tool automatically searches for the highest image quality that still fits under 100KB, recompressing the JPEG images embedded in your PDF entirely in your browser. Drop in your file and download the result — no account, no upload, no repeated trial and error.

Frequently asked questions

Why would I need a PDF under exactly 100KB?
This size limit shows up a lot on government portals, exam registration sites, and job application forms that cap document uploads at 100KB — often for a photo ID or a scanned signature page.
Can every PDF actually reach 100KB?
Only if there's enough recompressible image content to work with. This tool searches for the best JPEG quality that fits under 100KB — if your PDF is mostly text or already-optimized images, it may not be able to shrink that far, and the result will say so plainly rather than pretend it succeeded.
How is this different from the regular Compress PDF tool?
The regular tool lets you manually pick a quality level. This page automatically searches for the highest quality that still fits under 100KB, so you don't have to guess and re-try.
Are my files uploaded anywhere?
No. Compression happens entirely in your browser in a background thread; your file never leaves your device.

Need a different target? Compress to 1MB · Compress for email · or use the full Compress PDF tool with a manual quality slider.