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Compress PDF to 100KB

Hit an upload limit? Shrink your PDF to about 100KB while keeping text crisp and selectable.

One hundred kilobytes is an unusually tight ceiling and it is almost always a government e-filing system that sets it. A text-only PDF is often already under it without any work. A scanned document is a different matter, since each page is a photograph, and reaching this target from a scan means accepting visible softening. Where the document allows it, exporting from the original file rather than compressing a scan gives a far better result.

A 100KB limit is common on government e-filing portals, university submission systems, and some email providers with strict attachment caps.

At 100KB, pages with embedded images will be significantly recompressed. Text-only PDFs are often already this small. For best results, ensure your source PDF has standard resolution images rather than raw camera photos.

All compression runs entirely on your device using WebAssembly, so confidential contracts, financial documents, and medical records never leave your browser.

Compress PDF to 100KB →
  • Files never leave your device
  • No size limits
  • Free, no sign-up

How to compress pdf to 100kb

  1. 1
    Upload your PDF

    Drop your PDF into the secure browser dropzone. The file stays on your device. Nothing is uploaded.

  2. 2
    Set 100KB as target

    Choose target-size mode and enter 100 KB as your limit. The engine will iterate to hit this cap.

  3. 3
    Download compressed PDF

    Click compress, wait a few seconds, and download the optimized file. Text stays selectable and sharp.

Frequently asked questions

Will text stay readable at 100KB?

Yes. The compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

Is it private?

Absolutely. Everything runs locally in your browser via WebAssembly. Your PDF and its contents are never uploaded to any server.

What if my PDF is already under 100KB?

If your PDF is already smaller than 100KB, no compression is applied. You will get the original file back unchanged.

How does target-size mode work?

The engine iteratively adjusts image quality and resolution of embedded images, testing the output size after each step, until the result is at or below your 100KB target.

Can I compress multiple PDFs at once?

Currently the tool processes one PDF at a time, but you can quickly drop another file after the first finishes.

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