What is LuniPDF? (What)
LuniPDF is a suite of private PDF and image utilities for combining, splitting, arranging, signing, watermarking, converting and stripping photo location information.
When should you use LuniPDF? (When)
Use it to prepare application documents, combine scans, convert compatible photos, or remove hidden photo location metadata before sharing.
Where can you use LuniPDF? (Where)
Go to /lunipdf/ in a browser on a supported desktop or mobile device. Some repeated use may require a paid plan. Open the tool or explore other Lunibyte guides.
How do you use LuniPDF? (How)
Choose the correct PDF or image tool, select your local files, apply the desired action, download the result and reopen it independently to verify each page or image. Evaluate the benefits in your own context; a local-first design does not replace your responsibility to review outputs.
Why use LuniPDF? (Why)
It supports common document tasks without requiring a third-party upload-and-convert service to hold the original files.
Important limitations
Keep originals. Some operations may change formatting or image fidelity. A drawn signature is not identity verification; confirm free versus Pro use limits.
Why LuniPDF? Because Your PDF Should Never Have to Leave Your Computer
Think about what is inside your PDFs. Signed contracts with your signature on them. Tax returns with your income, your address, your family's details. Medical records. Pay stubs. Scans of your ID. Now think about what most "free" PDF websites ask you to do with those files: upload them — all of them — to a server you have never heard of, run by a company you cannot name, in a country you do not know.
That upload is so routine that most people never question it. We built LuniPDF to make it unnecessary.
The upload is the risk
Every uploaded file takes a trip: across the internet, onto a server, into a processing queue, into storage — sometimes for minutes, sometimes far longer, under a retention policy written in legal language almost nobody reads. Each stop is a chance for something to go wrong: a breach, a misconfigured bucket, an employee, a subpoena, a policy change after an acquisition. You cannot audit any of it. You just click "upload" and hope.
The uncomfortable truth is that for most everyday PDF jobs, the upload buys you nothing. Your laptop and your phone are powerful computers. Merging, splitting, compressing, signing and converting are all jobs they can do locally — if the tool is built that way. LuniPDF is built that way.
Not a promise — an architecture
Plenty of services promise to delete your files. LuniPDF never receives them in the first place. Every tool runs in your browser, in JavaScript, on your device. There is no upload step to secure and no server copy to delete, because the file never moves.
You can verify this yourself, and we encourage you to: open your browser's network tab while you use LuniPDF and watch the traffic. Your document is never sent anywhere. Once the page has loaded, the tools even keep working offline. That is not a privacy policy. That is physics.
Speed is the side effect
Removing the server removes the waiting, too. There is no upload progress bar crawling across the screen and no queue behind a thousand other users. Even a 100 MB file starts processing immediately, because the only machine involved is yours. The realistic limit is what your device can handle — most browsers comfortably process files up to a few hundred megabytes. For a tool people reach for in a hurry, that difference is felt every single time.
No account, no watermark, no catch
LuniPDF asks for nothing before it helps you. Your first 3 uses are included, in total, across all tools — no signup, no email, and no watermark stamped across your document like an advertisement. When you want unlimited use, LuniPDF Pro is priced below every major PDF brand. Twelve tools come in the box — merge, split, compress, organize, rotate, fill & sign, page numbers, watermark, JPG to PDF, PDF to JPG, HEIC to JPG and GPS location removal — and more are added regularly.
Honesty corner: what LuniPDF cannot do for you
Local processing protects your file in transit and on servers. It does not make your device invulnerable: browser extensions you install, the folder you download into, cloud backups that sweep up that folder, and the person you send the result to are all still part of your privacy story. Keep your device healthy, check every download before you send it, and think about whether a document should be shared at all. We would rather tell you that plainly than sell you a fairy tale — it is the same honesty we put into the tool itself.
The bottom line
Your documents are yours. The moment a tool asks you to upload them, you are trusting a stranger with the most sensitive paperwork of your life — for jobs your own computer can finish in seconds. LuniPDF removes the stranger. Open LuniPDF and do the job where the file already lives: on your device. New to it? Start with the step-by-step guide, or read about everything the new LuniPDF can do — both are linked at the top of this page and in our blog and guides.