PDF Still Too Large After Compression

Quick answer: When compression barely shrinks a PDF, the size lives in already-compressed objects — usually images. Here is the real fix path. Open PDF 压缩 — everything runs locally in your browser, and files never leave your device.

Steps

1. Check the size composition: over ~1 MB per page means images dominate.
2. Downsample scans: 600 DPI to 300 DPI halves the size with no visible print loss.
3. Compress source JPGs first, then rebuild the PDF.
4. Re-run compression with the balanced or high-compression preset instead of "high quality".

Important notes

• Text layers are tiny (tens of KB) — no amount of compression targets them.
• If you only need a few pages, Split beats Compress every time.
• For screen-only reading, rendering to 150 DPI images and rebuilding the PDF can cut size by 10x.

Common questions

Is compressing safe for the content? Yes — only images get re-encoded; always flip through the output once before delivering.

Why did "high quality" mode barely help? It deliberately preserves image fidelity — pick a stronger preset for size.