Compress PDFs online: scans and image-heavy files shrink 60-90% with adjustable quality. Local processing, no upload.
TL;DR: Free PDF compressor: scans shrink 60-90% with adjustable quality, processed locally for upload limits.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
使用指南
A 40MB scanned contract that will not fit an email, a portal capping uploads at 2MB — oversized PDFs are a constant. This tool re-renders and compresses each page (adjustable quality), cutting scans by 60-90%, fully locally.
1. Compress a PDF
- Drop a PDF file.
- Pick quality: 50-65% for scans (imperceptible), 40% for extreme sizes.
- Compress, compare sizes, download when satisfied.
2. Know your PDF type first
Results depend on composition: scan/image-heavy PDFs (one image per page) gain the most, often 60-90%; text-only vector PDFs are already tiny and re-rendering grows them — the tool honestly shows +x%, and at that point prefer deleting pages or splitting instead. Size intuition: over 5MB with few pages usually means a scan — compress away.
3. How it differs from the crowd
- Most online compressors upload your file — this one never leaves the device, which matters for contracts and IDs.
- Compression is lossy: text edges soften slightly. For lossless size reduction (legal archiving), use split/delete instead.
FAQ
Text-only vector PDFs are already tiny; rasterizing pages into images grows them — that is this tool's boundary. It shines on scans and image-heavy files (60-90%); compare before keeping for text PDFs.
Yes. Pages are re-rendered as JPEG (adjustable); text edges soften slightly. 50-65% is usually imperceptible on scans.
None — everything is local.