Why compress a PDF to under 100KB?
Many official upload forms enforce hard file-size limits. Government service portals, visa and immigration systems, job application trackers, university admissions and exam registrations commonly reject any PDF over 100KB. When your scanned certificate, resume or ID document comes out at several megabytes, you need a reliable way to shrink it under the limit — without installing software or uploading sensitive documents to a random website.
This page does exactly that: upload your PDF, compress it, and check the resulting size instantly. Everything happens locally in your browser, so personal documents with your name, photo or ID number never leave your device.
How to shrink your PDF under 100KB
1. Drop your PDF into the box above (or click to choose a file).
2. Pick a compression level: Recommended is a good first try; Strong produces the smallest files.
3. Press Compress PDF. The tool reports the new size immediately and tells you whether it is under the 100KB target.
4. If it is still too large, run it again on Strong, or split a long document and compress the sections separately.
Tips for hitting strict size limits
Scanned documents and phone photos of documents compress the best — often 80–95% smaller. PDFs that are already mostly text compress less, because there is little image data to shrink. If your file has many pages, splitting it into smaller parts before compressing is the most reliable way to get each part under 100KB.
Related size targets: 200KB, 1MB
Frequently asked questions
How do I get my PDF under 100KB?
Upload your PDF and press Compress PDF. The tool shows the resulting size right away. If it is still over 100KB, choose the Strong level and compress again. Scanned documents and phone photos compress the most.
Will the text still be readable?
Yes for normal reading and printing. This method re-encodes each page as an optimized image, so fine print may look slightly softer at high zoom. Keep your original if you need perfect archival quality.
Why do portals require such small PDFs?
Government sites, job application systems and school forms cap upload sizes to keep their servers fast and storage costs down. Common limits are 100KB, 200KB, 500KB and 1MB — this page is built for the strictest ones.
Is it safe to compress personal documents here?
Yes. Compression runs entirely on your device; nothing is uploaded to any server. That makes it suitable for IDs, certificates and applications containing personal data.
The result is still too big. What now?
Try the Strong level, or split a multi-page PDF with the split tool and compress the parts separately. Very image-heavy scans may need both steps.
Why is the text no longer selectable after compression?
Pages are flattened into images, which is exactly what makes scanned PDFs dramatically smaller. The trade-off is that text selection and searching stop working in the output file.