Merge PDF
Combine multiple PDF files into one professional document. No uploads, no server storage, 100% private.
Files stay on your device
Merge PDF Online (Free, Private & Unlimited)
Need to combine your bank statements, academic records, or legal contracts? Most PDF tools upload your sensitive files to their cloud servers. OptiKit never does. Our PDF merging technology runs entirely inside your web browser using WebAssembly.
Why Most PDF Mergers are a Security Risk
- Server Caching: Deleted files often persist on cloud backups for weeks after you merge them.
- Unencrypted Transit: Some sites use basic HTTP, making your PDFs vulnerable to "Man-in-the-Middle" attacks.
- Data Mining: Some free tools scan your PDFs for keywords to build advertising profiles.
- Password Exposure: If you merge a password-protected PDF on a server, that password is briefly stored.
The Professional PDF Merging Strategy
- Lossless Stitching: We combine the PDF data streams without decoding the pixels, keeping the quality 1:1.
- Metadata Cleanup: We normalize the document headers so your merged PDF looks consistent.
- Infinite Batching: Merge 2 or 200 files—as long as your RAM allows, we'll process it in seconds.
- Local Sandbox: Your files never touch our server, ensuring 100% compliance with privacy laws.
Typical Use Cases
Legal filings
Combine affidavits and evidence files.
Academic Records
Merge marksheets into one transcript.
Frequently Asked Questions
Is there a file size limit?
Since the merging happens in your browser's memory, the limit depends on your device. Most modern laptops can easily merge files up to 100MB.
Will the quality decrease?
No. Our tool uses lossless merging technology. It simply combines the page streams without re-compressing them.