Does compressing a PDF reduce quality?

For text-heavy PDFs the quality stays the same. For image-heavy PDFs there may be a slight reduction in image sharpness, but the result is usually not noticeable on screen.

Is my PDF uploaded to a server?

No. Compression runs entirely securely in your browser without uploading using JavaScript. Your file never leaves your device.

How much can I reduce the file size?

Results vary by content. Image-heavy PDFs typically shrink 40–70%. Text-only PDFs may shrink 10–30%.

What is the maximum file size I can compress?

There is no hard limit enforced by the tool. Very large files (500 MB+) may be slow because processing happens securely in your browser without uploading.

PDF

压缩PDF

Convert every page to JPEG and rebuild PDF – maximum compression, but text will become images.

点击或拖拽

PDF files only

Compression settings

Adjust quality and rendering scale.

Target output size (MB)

Enter desired final file size. Tool will test 3 pages and suggest quality/scale.

JPEG quality

Recommended90%

Smaller fileBetter quality

Render scale

Recommended100%

Faster / smallerBetter quality

💡 Tip: For extreme compression, try quality 50% and scale 70%.

Upload a PDF to compress.

⚠️ Image mode: All pages are rasterized to JPEG. Text will no longer be selectable. Best for scanned documents or image‑heavy files.

PixTrimIO 可让 PDF 和图片处理快速、私密，并直接在浏览器中完成。 Privacy-first PDF and image tools that run entirely in your browser. Compress, merge, convert, crop, OCR, and edit files online for free without uploading.