Lumen PDF Editor —
document workflows without the friction.
Lumen is a free online PDF editor. Edit, merge, split, sign, annotate, and convert PDFs in your browser — no install, no watermark.
Drop your PDF here to start
Or click to browse from your device
Sign in to save your documents and unlock all tools.
PDF tools
Choose the task you need and start right away.
Let AI read your PDF so you do not have to.
Upload any PDF and chat with it. Summarize long contracts, extract key points, rewrite text, suggest tags, and find action items — all in one place.
How to access: Sign in → Open your Document Library → Click AI Assistant in the sidebar.
From file to finished in three steps
Watch Lumen turn a plain PDF into an editable, intelligent document.
Built for how you actually work
Honest tools, clear pricing, no surprises.
Works in your browser
No downloads, no installations. Open any tool and start immediately on Windows, Mac, Linux, or Chromebook.
Your files stay private
Documents are processed locally in your browser. Nothing is uploaded to third-party servers unless you choose to save to your cloud library.
Start for free
Start at $0 with core tools and basic cloud storage. Upgrade for more power and unlimited features — no forced subscriptions.
Your document library
Logged-in users get a permanent home for processed files.
Sign in to access your personal workspace, recent edits, and shared documents.
Sign in to your libraryCredits vs Pro — which one are you?
Use Lumen a few times a month? Credits are cheapest. Use it every day? Pro pays for itself — everything's unlimited, nothing per-action.
Two ways to pay — pick what fits you
Occasional user? Buy credits. Regular user? Get a subscription and everything's included.
For occasional users
Edit a PDF once a week or less? Buy a small pack, use it whenever, never worry about a monthly bill.
- · 10 free credits when you sign up
- · Packs from $3 · credits never expire
- · 1 credit / action · AI 4 credits · OCR 3 credits
For regular users
Editing PDFs every day? Pro covers every action — including AI and OCR — at no per-action cost.
- · From $4.17/mo · billed monthly or yearly
- · Unlimited edits, AI, OCR — no credits used
- · Bigger files, more storage, priority speed
Frequently asked questions
Quick answers about Lumen, pricing, and privacy.
- Is Lumen really free? +
- Yes. You get 2 free edits per day plus 10 welcome credits on signup. After that, pay only for what you use — 1 credit per action — or go Pro for unlimited everything.
- Do I need to install anything? +
- No. Lumen runs in any modern browser — Windows, Mac, Linux, Chromebook. There is nothing to download.
- Are my files private? +
- Yes. PDFs are processed in your browser and never uploaded to a third party. Files saved to your personal library are encrypted at rest.
- How is Lumen different from Adobe Acrobat? +
- Lumen covers the everyday tasks most people use Acrobat for — editing, merging, signing, annotating, converting — without the install, the subscription, or the steep learning curve.
- Will there be a watermark on my output? +
- Never. Free or paid, Lumen never adds watermarks to your PDFs.
Share your feedback
Have a suggestion or ways to improve? We read every message.