Fill in and sign forms, edit text, redact, organize pages and lock files with a password — for Mac and Windows, from Starsonn.
The tools people actually reach for, in one fast app. Open a PDF and pick a tool — no account needed to start, no uploads, no waiting.
Type straight into PDF forms — text boxes, check boxes, radio buttons and drop-downs — then sign with a typed, drawn or photographed signature.
Click a line to change it, add text and images, white out what shouldn’t be there, and add watermarks, headers, page numbers and Bates numbers.
Mark an area or search for a word, and NEBULA removes it from the file for good — not just a black box on top.
Drag to reorder, rotate, delete, insert, extract and split. Combine PDFs and images into one file.
Sticky notes, highlights, underline and strike-out that snap to the text, plus drawing, boxes and arrows.
Lock a PDF with an AES-256 password and choose whether people can print, copy or change it.
Both plans include every feature, on Mac and Windows. Your license key arrives by email the moment you check out.
Always on the newest version. Cancel any time and keep using it until the year ends.
Buy it once and keep this version for good, with a year of free updates included.
NEBULA is on Mac and Windows today. More are on the way — email us to hear first.
Fill and sign forms on the go.
Coming soonPhones and tablets.
Coming soonUbuntu, Fedora and more.
Coming soonOpen NEBULA in any browser.
Coming soonNo account to create. Your key is your license.
Pay securely. Your receipt and license key arrive by email right away.
Get the Mac or Windows installer below and open it.
NEBULA asks for your key the first time it opens, activates this computer, and you’re in.
You’ll enter your license key the first time NEBULA opens.
macOS 11 Big Sur or later · Apple silicon and Intel
NEBULA-PDF-1.0.2-mac-arm64.dmgDownload for MacAnything else — write to hello@starsonn.com.
Yes. Each license activates on 2 computers, in any mix of Mac and Windows. To move it, choose NEBULA → License & account → Deactivate on the old computer.
If you don’t renew, NEBULA asks for an active key the next time it checks in. Your PDFs are ordinary files on your computer and open in any PDF reader.
You own the version you buy for good, plus every update released in the 12 months after purchase. After that, you can keep using it as is or buy an upgrade.
No. NEBULA works entirely on your computer. It only goes online to check your license and look for updates, and keeps working offline for 14 days between checks.
When a new version is out, NEBULA tells you the next time it opens and gives you a Download update button. You can also choose NEBULA → Check for updates any time. Install the new version over the old one — your sign-in, license and signatures stay put.
It’s in your purchase email, and in the Lemon Squeezy customer portal linked from that email. Or write to us and we’ll resend it.