Reduce PDF size without losing quality
the goal is a smaller file that still looks identical. This page covers the fastest way to get under the limit — and the specific trade-off you are making at each quality level.
Compress PDF — free and local
Shrinks a PDF with four presets — lossless cleanup, light, balanced and extreme.
The fastest path under the limit
Drop the file into the compressor and start with Balanced. For most documents this cuts 60–80% of the size while keeping body text sharp on screen. If the result is still too large, step down to Extreme; if it is comfortably small, try Light for a better-looking file.
You will see the exact output size before downloading, so there is no trial-and-error loop of uploading and being rejected.
What you give up at each level
Light: roughly 160 DPI. Images stay detailed, small print stays readable, text remains selectable only in lossless mode. Balanced: roughly 110 DPI, ideal for on-screen reading, still fine when printed on a home printer. Extreme: roughly 72 DPI, visually soft, suitable for previews and thumbnails.
If the document contains signatures, stamps or small footnotes that must remain verifiable, stop at Light. If it is a form the reviewer will scroll on a phone, Balanced is invisible to them.
When compressing is the wrong tool
If the file is huge because it contains 300 pages you do not need, split it first and compress only the relevant range. Compression reduces each page; splitting removes pages entirely. The second is far more effective when the reviewer only reads the first five pages.
If the PDF must remain searchable and the portal does not require a specific size, use the lossless preset: it rebuilds the file structure and strips metadata without touching page pixels.
Questions
Will the recipient be able to tell it was compressed?
At Light and Balanced, almost never on screen. At Extreme, yes — edges soften and small text becomes fuzzy. Preview the file before sending if the document is important.
Does the file get uploaded to your server?
No. The compressor runs in your browser tab. There is no upload endpoint, so nothing can be retained or leaked.
Can I keep the original quality and still shrink it?
Only by removing content — pages, embedded fonts or metadata. The lossless preset strips metadata and rebuilds the structure, which typically saves 2–15% with zero visual change.
Related
SlimPDF runs every tool in your browser. No file is ever uploaded, stored or shared.