Compress PDF and Merge – Combine & Reduce PDFs Online Free
Most PDF tools force you to compress first, then merge – wasting time and sometimes doubling file sizes. ratpdf.com lets you compress and merge simultaneously. Upload multiple PDFs, and we'll optimize each one, then combine them into a single compact PDF.
Perfect for combining scanned chapters, merging reports, or creating a portfolio from large files – all while keeping the final size under control.
Stop doing two jobs. Compress and merge in one click. Try our tool now – free and fast.
Try Compress + Merge ToolPerfect for these scenarios
- 📚 E-books & manuals – Combine chapters (each a large PDF) into one compressed book.
- 📎 Email attachments – Merge 5 PDFs into 1 file under 25MB for Gmail.
- 📑 Contract bundles – Signatures, exhibits, addendums – compress and merge into a single document.
- 🖼️ Image‑heavy portfolios – Reduce image sizes while combining multiple designs.
Why compress and merge together?
- ✅ One step, not two – Upload multiple files, get one compressed merged output
- ✅ Intelligent per‑file compression – Each PDF is optimized individually before merging
- ✅ Preserve order – Arrange files in any sequence before processing
- ✅ No intermediate downloads – We don't make you download compressed versions first
- ✅ Final size control – Overall output is smaller than merging then compressing
How to compress and merge PDFs in 3 steps
- Upload multiple PDFs (up to 10 files, 100MB total).
- Arrange them in the order you want (drag & drop).
- Click 'Compress & Merge' – download one optimized combined PDF.
💡 Pro tip: You can set different compression levels per file (e.g., maximum for old scans, basic for text documents).
⭐ Trusted by 1200+ users who save time – rated 4.8/5 for efficiency.
Frequently Asked Questions
Is it better to compress before merging or merge before compressing?
Compressing each file individually before merging usually gives the smallest final size. Our tool does exactly that – per‑file compression, then merge. Merging first often results in a larger output because the merged file contains redundant compression metadata.
How many PDFs can I compress and merge at once?
You can upload up to 10 PDFs at once, with a total combined size of 100 MB. For larger needs, contact us for a custom plan.
Does this preserve bookmarks, links, and forms from each file?
Yes, each file's internal links and forms are preserved. Global bookmarks from individual PDFs are not merged into a single outline, but the content and interactivity stay intact.
What order does the merging follow?
You can drag and drop files to reorder them after uploading. The final PDF will follow that order. By default, we use the order of upload.
Can I compress and merge password‑protected PDFs?
If you have the password, enter it for each locked file during upload. We'll unlock, compress, and merge – the output will NOT be password‑protected unless you re‑add a password.
Is there a watermark on the merged file?
Never. Your output is completely clean – no watermarks, no 'created by' stamps. Free and professional.