Should I use 100 KB for photos or scans?

Only if the portal strictly requires it. For photos, 500 KB or 1 MB usually preserves enough detail.

Why does the 100 KB preset reduce quality so much?

To hit such a small size, images are heavily compressed and color depth may be reduced. Use it only when the size limit is strict.

Free Online Tool

Compress PDF to 100KB Free

Make a PDF small enough for the strictest upload limits. Best for short text documents and forms.

Compress to 100KB

How to Use This Tool

1
Upload the short PDF you need under 100 KB.
2
Use the strongest compression preset compatible with your content.
3
Download the tiny PDF.

Reality check

Target sizes are best-effort. Scanned PDFs usually compress more; already optimized text PDFs may shrink only a little. Always verify file size and readability before upload.

Why use sotool?

Strict Limit Ready

Optimized for portals and forms that cap single files at 100 KB.

Best for Text Documents

Single-page invoices, forms, and plain-text PDFs fit best at this size.

No Signup Needed

Start using the tool immediately without creating an account or logging in.

Browser-Based

Works on Windows, Mac, Linux, Android, and iOS as long as you have a modern browser.

Frequently Asked Questions

A one-page form, invoice, or plain-text document. A scanned page at 100 KB will be blurry unless it is mostly black-and-white text.

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