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Compress PDF to 100KB

Compress a PDF to 100KB or less online for free — the limit is preset to 100KB, so just drop your PDF. Lossless compression is tried first; if that isn't enough, you get the sharpest version that still fits. Runs 100% in your browser.

100% private — your PDF never leaves your browser. Conversion happens on your device; nothing is uploaded.

100% private — runs in your browser

Lossless compression is tried first, so text stays selectable when that’s enough. If not, pages are turned into optimised images at the highest quality that fits your limit. Page sizes never change. Your PDF never leaves your device.

How to compress a PDF to 100KB

  1. Drop your PDF here, or click to choose it — the limit is already set to 100KB.
  2. Tick grayscale if colour doesn't matter — it makes files much smaller.
  3. Click “Compress PDF”. The tool tries lossless compression first, then finds the best quality that fits.
  4. Download the PDF — it's now under 100KB.

What you can use it for

  • Upload limits on job, visa and government portals
  • University and exam application forms
  • Emailing scanned documents
  • Insurance and bank document uploads

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Frequently asked questions

How do I compress a PDF to 100KB?

Drop the PDF in and click “Compress PDF”. The limit is already 100KB; the tool tests different quality levels and saves the sharpest version that fits.

Will my PDF still have selectable text?

If lossless compression is enough to reach the limit, yes — nothing else changes. If not, pages are turned into optimised images to fit, and the result tells you so; text in that copy can't be selected.

Why can't my PDF get small enough?

Very long or image-heavy PDFs may not fit a small limit and stay readable. The tool then gives you the smallest readable version — try removing pages with Delete PDF Pages, splitting the file, or turning on grayscale.

Can a multi-page PDF fit in 100 KB?

Short text documents usually can. Long scans may need grayscale, fewer pages or a larger limit to stay readable.

Will it be exactly 100KB?

It will be just under. The tool aims about 3% below 100KB so the file passes upload checks whether a site counts 1 KB as 1,000 or 1,024 bytes.

Is my PDF uploaded?

No. Compression runs entirely in your browser, so documents with personal details never leave your device.