How do I compress a PDF to 100 KB exactly?

Enter 100 in the target box; the tool finds the best quality that stays at or below 100 KB, or reports the closest it could reach if that size is below the document's floor.

Why did my compressed file lose its text layer?

Hitting a strict size means rasterizing pages to images, which removes the selectable text; this trade-off is stated up front so it never surprises you.

Does compression ever increase the file size?

For PDFs that are already pure compact text, rasterizing can add bytes; in that case keep your original, since there is nothing image-heavy to squeeze.

Can I just shrink it without naming a target?

Yes — leave the target blank and the tool applies a sensible quality reduction in one pass.

Stays on your device

Compress a PDF to an exact target size, in your browser

This compressor shrinks a PDF and can target an exact figure such as 100 KB or 200 KB. Type the size you need and the tool repeatedly re-encodes the pages, hunting for the highest quality that still lands at or under your number — and it does all of that arithmetic on your own hardware, with the document staying inside the tab.

Pick a PDF, optionally type a target size in KB, and download a smaller version with an honest readout of the final size.

Drag a PDF here to reduce its size

Best for scans and image-heavy PDFs. The engine loads the first time you use it.

Choose a file

How this works

What happens when you use this tool

Each page is drawn to an off-screen canvas with the Mozilla pdf.js renderer, re-saved as a JPEG, and rebuilt into a new PDF using pdf-lib — the approach that genuinely cuts the bytes of scan-heavy documents.

When you set a target, the tool binary-searches the JPEG quality (and, if needed, the resolution) and reports whether it reached your figure or hit the document's natural floor.

What this tool can't do

There is a real size floor: Every page still costs some image bytes even at the lowest quality, so a tiny target on a many-page file can be physically impossible; when that happens the tool gives you the smallest result it reached and says so plainly.
Text stops being selectable: Because pages are turned into images to hit a size, the output is no longer searchable or copy-able text — if you must keep a live text layer, this method is not the right fit.

FAQ

Frequently asked questions

How do I compress a PDF to 100 KB exactly?: Enter 100 in the target box; the tool finds the best quality that stays at or below 100 KB, or reports the closest it could reach if that size is below the document's floor.
Why did my compressed file lose its text layer?: Hitting a strict size means rasterizing pages to images, which removes the selectable text; this trade-off is stated up front so it never surprises you.
Does compression ever increase the file size?: For PDFs that are already pure compact text, rasterizing can add bytes; in that case keep your original, since there is nothing image-heavy to squeeze.
Can I just shrink it without naming a target?: Yes — leave the target blank and the tool applies a sensible quality reduction in one pass.