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Compress PDF to 100 KB Online Free
Need a PDF at 100 KB or under? The free PDF Compress tool re-compresses the scans and photos inside your PDF — try Balanced, check the new size, and step up to Maximum if it is still over 100 KB. No sign-up, and your file never leaves your device.
Facts at a glance
- Tool: PDF Compress (Light / Balanced / Maximum levels)
- Exact-KB target setting: none — result depends on PDF contents
- Price: Free
- Sign-up: None
- Processing: In your browser — your file is never uploaded
- Tool steps checked: 27 October 2026
What the tool does
PDF Compress re-compresses the page images inside a PDF — the scans and photos that make up most of a document's weight. It offers three levels and shows the new size before you download:
- Light — 200 DPI, quality 0.85. Keeps pages sharpest, with only a slight reduction.
- Balanced — 150 DPI, quality 0.72. The default, and a good middle choice.
- Maximum — 100 DPI, quality 0.55. Makes the smallest file.
Please read before you compress: this tool works best for scanned or photo-heavy PDFs. Text-based PDFs may not shrink much. Each page is rebuilt as an image, so text in the result is not selectable or searchable — and your original file is left untouched.
How to compress a PDF to 100 KB
- Open PDF Compress (the button above takes you straight there).
- Add your PDF — tap to choose a file, or drag and drop it here.
- Start with the Balanced level and tap Compress PDF.
- Check the New size shown. If it is still over 100 KB, run the tool again on your original PDF at the Maximum level.
- If the result reads clearly, tap Download PDF. If the tool reports the PDF could not be made smaller, your original file is already the smallest version — upload it as it is.
Why won't my PDF reach 100 KB?
It depends on what is inside. Scanned and photo-heavy PDFs often shrink a lot, because the tool re-compresses the page images. A PDF that is mostly text is already small and may barely change — no compression level can squeeze text that is already compact.
There is no exact-KB target setting, so reaching 100 KB is not guaranteed: a short text-only PDF may already be under 100 KB before you start, while a long scanned document may need Maximum and still land over it. Check the New size after each run and judge from the real number, not a promise.
Remember the trade: each page of the result is rebuilt as an image, so text in the compressed PDF is not selectable or searchable. Keep your original file — the tool never changes it.
More size targets
Compress image to 20 KB
Compress image to 50 KB
Compress image to 100 KB
Compress PDF to 200 KB
PDF Compress — the full tool
About this page
This page describes the PDF Compress tool — it is not an exam specification. The tool steps above were checked against the live tool on 27 October 2026. Your files are processed in your browser and never uploaded; final acceptance of any file is decided by the form or portal you submit to.