- 1Upload
- 2Process
- 3Download
Merge PDF online, free
Combine PDFs into one file in any order, with bookmarks per file, blank-page inserts and alternate-page merging for duplex scans.
- Runs in your browser — no upload
- Free, no sign-up, no watermark
How to use Merge PDF
- 1
Add your PDF files
Drop one or more files on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.
- 2
Fine-tune the settings
Set order and alternate pages in the Fine-tune panel, or keep the defaults — they suit most files.
- 3
Run Merge PDF
Press the start button. Processing happens on your device, usually in seconds.
- 4
Download the result
Save the finished file, or continue with another tool without downloading in between.
What Merge PDF can do
- Order — File order (file ids)
- Alternate Pages — Interleave pages of two files (duplex scan fix)
- Private by design — files are processed in your browser and never uploaded
- Batch processing — up to 500 files at once
- Free with no sign-up, no watermark and no daily limit
Merge PDF — frequently asked questions
Is Merge PDF really free?
Yes. Merge PDF is free forever on Sada Files — no ads, no premium tier, no watermark, no daily cap that pushes you to pay. Every option on this page is available to everyone.
Do I need to sign up or create an account?
No. There is no account system at Sada Files. Open the page, drop your file, pick your options and save the result. History and saved workflows stay on your device.
Is my file uploaded anywhere?
No. Merge PDF runs on your device — in your browser using WebAssembly, or inside the free native app. Your file never leaves your computer or phone, which is why there is no upload wait.
Which formats does Merge PDF accept?
Merge PDF accepts PDF. Files are identified by their content, not their extension, so a mislabelled file still works.
Is there a file size or file count limit?
Only what your device can handle. Because processing happens locally there is no server cap, no queue and no "upgrade for larger files" message. Batch as many files as you like.
Can I chain Merge PDF with other tools?
Yes. After every result a Continue with… menu lists every tool that accepts this output, and the file is handed over in memory. Save the chain as a workflow and re-run it on hundreds of files, or call it in one API request.
Does Merge PDF work on my phone?
Yes. The web app works on Android and iOS browsers, and the free Sada Files app for Android, iOS, Windows, Linux and macOS runs Merge PDF fully offline.
Related tools
- Split PDFSplit a PDF by page ranges, every N pages, file size, bookmark level or blank separator pages, or extract every page as its own file.
- Organize PDFReorder, rotate, delete, duplicate pages in a thumbnail grid and insert pages from another PDF.
- Compress PDFReduce PDF file size with presets or an exact target size — control image DPI and quality, downsample, subset fonts and strip metadata.
- Crop PDFCrop PDF pages with a visual box, auto-trim margins, lock an aspect ratio and apply to all or selected pages.
- Delete PagesRemove pages from a PDF by range, odd/even, or automatically detected blank pages.
- Extract PagesPull selected pages out of a PDF — ranges, odd or even pages — as one file or separate files.
- N-up / BookletPrint several pages per sheet (2, 4, 6, 9) or impose a booklet for folding, with gutter control.
- Add Margins / BleedAdd uniform or per-side margins or print bleed in mm, inches or points.