PDF Tools
How to Compress PDF on iPhone: 5 Easy Methods
Discover five practical ways to compress PDF files on iPhone using OneFileKit, Adobe Acrobat, iOS file tools, and image optimization.
Read ArticleMERGE PDF
Merge PDF Files Online for Free
Combine PDF files online for free with OneFileKit. Upload, reorder and merge multiple PDFs into one document without installing software.
Up to 50 files · 100MB each · Automatic cleanup after 60 minutes
Upload
Drag & drop your PDF files here
or click to browse files
Supports multiple PDF files (max 50 files, 100 MB each).
Merge Options
Preview
0 / 0100%
Add at least two PDFs to merge.
Why merge with OneFileKit
Combine PDF files in the browser, then download one document.
100% Secure
Files are processed securely and deleted automatically.
Fast Merging
Quick, high-quality processing for everyday PDF sets.
Maintain Quality
Preserves original layout and formatting where practical.
No Software Required
Works directly in your browser — no installs.
How to Merge PDF Files Online
Upload, arrange, choose options, and download one PDF.
1
Upload PDF Files
Choose or drag & drop multiple PDF files.
2
Arrange Order
Reorder files by dragging or moving up and down.
3
Set Options
Choose page size, blank pages and numbering.
4
Merge PDF
Click Merge PDF to create your combined file.
Combine Multiple PDF Files Into One Document
Need to combine several PDF documents into one file? OneFileKit's free online PDF merger lets you upload multiple PDFs, arrange them in your preferred order and create a single downloadable document.
Whether you're combining business reports, university assignments, invoices or scanned documents, you can merge up to 50 PDF files using your browser. Choose custom file ordering, preview your documents and adjust available page settings before merging.
The Merge PDF tool supports different page sizes and optional features such as blank separator pages and page numbering. For the best results, review your document order and settings before downloading the final PDF.
Frequently Asked Questions About Merging PDFs
Upload two or more PDF files, arrange them in your preferred order, click Merge PDF and download the combined document.
Yes. OneFileKit provides a free browser-based PDF merging tool.
The page currently supports up to 50 PDF files, subject to configured upload limits.
Yes. Use custom drag-and-drop ordering or sort files alphabetically by filename.
Yes. OneFileKit works through a compatible web browser.
Yes. Use Auto to preserve original page sizes where practical, or select a supported standard page size.
Encrypted PDFs must be unlocked before they can be merged.
The tool aims to preserve original content and formatting where practical, but certain advanced PDF features may not be retained.
Yes. The page currently provides optional page-number settings.
The page states that temporary files are automatically cleaned up after 60 minutes.
Security & Privacy
Files are validated before merging, stored privately, and deleted automatically after processing.
File Validation
Each file is validated by extension, MIME type and PDF magic bytes before it is merged.
Encrypted PDFs Rejected
Password-protected PDFs are rejected with a clear message. Unlock the file and upload it again.
Private Storage
Uploads and finished files stay in private storage and are never placed on a public web path.
Protected Links
Download and preview links require a secret token that belongs to your job.
Upload Limits
File count, per-file size and total upload size limits protect the merger from oversized jobs.
Automatic Deletion
Temporary files are deleted automatically after the configured retention period.
Related tools
Other PDF tools you can use with a merged document.
Ready to get started?
Try Merge PDF free online — no registration required.
