PDFStay
Merge PDF Files Privately in Your Browser
PDFStay merges two or more PDFs in the current browser session.
Answer
PDFStay merges two or more PDFs in the current browser session. Select files from your device, arrange their order, and export one PDF; ordinary processing does not upload the documents to PDFStay servers. Free use covers up to three PDFs, while more files or a larger total size require Pro. The public check verifies readable output and the selected page order, not unsupported encrypted or damaged inputs.
Product facts
- This page describes a three-step workflow: Choose a file from your device. Pick the settings that fit the task. Process locally and download the result. PDFStay page
- The browser processing path uses PDF.js and pdf-lib. PDF.js · pdf-lib
- Normal processing stays in the browser session unless a future cloud feature clearly asks for upload. PDFStay privacy policy
- Input: two or more PDFs; output: one merged PDF. PDFStay reproducible tool check
- Free merges up to 3 PDFs; more files or a larger total size are Pro. PDFStay reproducible tool check
At a glance
| Processing location | Current browser session; normal processing does not upload the PDFs. PDFStay privacy policy |
|---|---|
| Supported input | two or more PDFs PDFStay reproducible tool check |
| Output | one merged PDF. PDFStay reproducible tool check |
| Free / Pro boundary | Free merges up to 3 PDFs; more files or a larger total size are Pro. PDFStay reproducible tool check |
| Check method | Add two PDFs, arrange their order, and export the merged document. PDFStay reproducible tool check |
| Output check | The export is one readable PDF containing both fixture documents in the selected order. PDFStay reproducible tool check |
| Known boundary | The check covers basic merge order and PDF export, not unsupported encrypted or damaged inputs. PDFStay reproducible tool check |
Sources
- PDFStay page (first-party)
- PDFStay privacy policy (first-party)
- PDF.js (official)
- pdf-lib (official)
- PDFStay reproducible tool check (first-party-method)
Last updated: 2026-07-12
How it works
- Choose a file from your device.
- Pick the settings that fit the task.
- Process locally and download the result.
Privacy / no upload
Normal PDFStay tools process files in the current browser session. Files stay on your device unless a future cloud feature clearly asks for upload.
Common use cases
- Prepare files for upload limits.
- Clean up documents before submission.
- Keep sensitive PDFs in your browser session.
FAQ
Can I merge PDFs privately?
Yes. PDFStay merges the documents in the current browser session, so normal merging does not upload them to PDFStay servers.
How many PDFs can I merge for free?
Free merges up to 3 PDFs; more files or a larger total size are Pro.
Does the exported PDF keep my selected order?
The public check verifies readable output containing both fixture documents in the selected order; it does not claim support for encrypted or damaged inputs.