Compress a PDF to a Target Size
Most compressors just "make it smaller" and leave you guessing. This one aims at a number: type the size you need — 100 KB for an upload field, 500 KB for email, whatever the form demands — and it re-renders the PDF at progressively lower quality until the result fits under your target. Everything happens in your browser; the file is never uploaded.
Drop PDF files here or click to select
One or many · each is compressed to the same target
No PDF handy? The 5 MB sample is a good compression target. More free sample files.
How it hits the target
The tool works down a quality ladder. First it tries a quick lossless re-save — if your PDF is already close, that may be enough. If not, it rasterises the pages at successively lower resolutions (200 dpi, then 168, 144, 120…) and JPEG quality, stopping at the first setting whose output fits under your target. You get the highest-quality version that still meets the size, not the most crushed one.
When a target simply isn't reachable
Physics wins sometimes. A 40-page text document won't reach 50 KB without becoming unreadable, and a single high-detail scan has a floor. When that happens the tool doesn't silently hand you a file that's still over the limit and pretend it worked — it returns the smallest version it could make and tells you the actual size, so you can decide whether to raise the target, split the document, or accept the result. Honesty beats a false "done."
Common size targets, and why
- 100 KB — tight web upload fields, older forms, avatar-sized document slots.
- 200 KB — many government and visa portals cap here.
- 500 KB — comfortable for email and most application forms.
- 1 MB — a common "max attachment" for lightweight systems.
How to compress a PDF to a specific size
- Drop your PDF into the drop zone, or click it to pick a file. Several files at once is fine — each is compressed to the same target.
- Type your target in KB or use a quick-pick button (100 KB, 200 KB, 500 KB, 1 MB). The target is the ceiling, not a goal to overshoot.
- Click Compress & download. The tool tries a lossless re-save first, then walks a quality ladder and binary-searches the last gap so the result lands just under your target rather than far below it.
- Read the verdict. You get the achieved size, the DPI and JPEG quality that produced it, and — if the target was physically unreachable — a plain statement of the smallest size possible instead of a silent failure.
- Download the result from the output list. Check it opens and reads correctly before sending it anywhere.
FAQ
How do I compress a PDF to a specific size?
Drop the file in, type your target in KB (or tap a quick-pick), and click compress. The tool lowers quality step by step until the output is under that size, then hands you the result with the achieved size shown. No upload — it all runs locally.
Will the text still be selectable afterwards?
Only if the lossless re-save alone met your target. Once the tool rasterises to hit a smaller size, pages become images, so text is no longer selectable or searchable. If you need both small and selectable, raise the target or use the regular compress tool in its non-rasterising mode.
Why did my file come back larger than the target?
Because the target wasn't physically reachable without destroying legibility. The status message tells you the smallest size achieved — from there, raise the target a bit or split the document.
Is the file uploaded to a server?
Never. Compression runs in your browser via pdf.js and pdf-lib. See the privacy policy.
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- Redact PDF — Black out regions and delete the text under them.
- Fill a PDF Form — Fill AcroForm fields and flatten.