Compress PDF to 100 KB free
Reduce your PDF to under 100 KB directly in your browser. Perfect for email attachments, form uploads, and web sharing. No upload, 100% private.
Drop files or click to choose
100% local private compression. Files never leave your device.
How compressing a PDF to 100 KB works
- 100% private — runs in your browser. Compression runs with Ghostscript compiled to WebAssembly inside your browser tab. Your PDF never leaves your device: nothing is uploaded, stored or seen by anyone else.
- Presets, not a size slider. MiniFiles doesn't aim for an exact file size. It recompresses the images in the PDF at a fixed resolution and shows you the new size before you download, so you can check it fits under 100 KB.
- Free and Pro presets. Free use applies Balanced (images at 150 DPI). Pro adds Maximum (72 DPI, the smallest files), High Quality (300 DPI) and Lossless.
- What's realistic. A text-only document of a few pages usually fits under 100 KB. Scanned pages and photos are what make a PDF heavy, so a long scanned document may not get there by compression alone.
- When it's still too big. Keep only the pages you need with Split PDF, then compress the smaller file. Text and vector graphics stay sharp at every preset; only images lose detail.
Too many pages? Split the PDF first.
Frequently asked questions
Can I compress a PDF to exactly 100 KB?
Not to an exact size. MiniFiles recompresses the images in your PDF with a preset and shows the new size before you download. Text-only PDFs usually land under 100 KB; image-heavy ones may need the Maximum preset (Pro) or fewer pages.
Does compressing to 100 KB reduce quality?
Text and vector content remain sharp. Images within the PDF may be recompressed at lower quality to hit smaller sizes. We recommend previewing the result before sharing.
Is my PDF uploaded to a server?
No. All compression happens locally in your browser. Your PDF never leaves your device.
What if my PDF is too large to reach 100 KB?
Remove the pages you don't need with Split PDF and compress again, or use the Maximum preset (Pro), which recompresses images at 72 DPI.
Need a different size?
The general PDF compressor handles any PDF, with all presets on Pro.