Compress PDF to Size
Shrink a PDF down to a target file size, like 100 KB.
Drag & drop files here, or click to select
How to Compress a PDF to a Specific Size
Upload the PDF you want to shrink.
Enter your target size and choose KB or MB.
Click "Compress to Target Size" — your browser searches for the best quality that fits your target.
Your compressed PDF downloads automatically, at or under your target size.
Why Use SonuPDF to Compress to a Target Size?
Set an Exact Goal
Enter the exact size you need — for an email attachment limit or an upload form — instead of guessing at a quality slider.
Automatic Quality Search
The tool automatically tries different compression levels to land as close as possible to your target without going over.
Skips Unnecessary Work
If your file is already under the target size, it's downloaded as-is — no quality is lost for nothing.
100% In-Browser
Every page is rendered and re-compressed on your own device. Your PDF is never uploaded.
Frequently Asked Questions
The tool will get as close as it can and clearly warn you if it can't reach your exact target, giving you the smallest file it was able to produce instead of failing silently.
Each page is re-rendered as a JPEG image at a search-optimized quality level and reassembled into a new PDF — the same technique used by our regular Compress PDF tool, but automated to hit a size goal.
Yes — like most size-based compression, pages are converted to images to significantly reduce size, so text will no longer be selectable in the compressed output.
No. Every step — rendering, compression, and reassembly — happens locally in your browser.