Everyday work stays on your computer
Opening, editing, merging, splitting, rearranging, annotating, compressing, signing, printing, and saving are designed to run locally. Your documents don't need to leave your computer for everyday PDF editing.
Lambda PDF Basic
A PDF editor everyone can own.
Lambda PDF Basic is a capable, local-first PDF editor for Windows. Edit text and images, organize pages, merge and split, annotate, fill forms, sign, and protect PDFs on your own computer. Pay once and keep it: a perpetual licence with no subscription.
Windows desktopComing soon for Windows
$39.99USD once · perpetual licence · no subscription
Developed by Eigenexis Systems
What it does
Everything an everyday PDF editor needs
Open, edit, organize, review, fill, sign, create, and protect PDFs in one Windows application. This list comes from the same product catalog that sets the price, so the two always describe the same product.
Open, read, and print
- PDF viewing
- Production-quality page rendering
- Page navigation
- Tabbed documents
- Text search
- Text selection and copy
- Printing
- Save without losing content
Edit content
- Add, edit, and delete text
- Basic image and object editing
Organize pages and documents
- Insert, delete, reorder, rotate, duplicate, extract, and replace pages
- Merge PDFs
- Split PDFs
- Crop pages
- Bookmarks
- Links
Review and mark up
- Highlight, underline, strikeout, notes, shapes, lines, arrows, freehand, and stamps
Forms and signing
- Form filling
- Basic signing
Create and optimize
- Create PDFs
- Images to PDF
- Compression and optimization
Protect and describe
- Passwords and document security
- Document properties and metadata
Work safely
- Undo and redo
- Autosave and recovery
Local-first by design
Your PDF. Your computer. Your data.
You should be able to see what you are sharing. Lambda PDF Basic is designed so everyday PDF work never needs an upload, and anything it does share is visible to you first.
Optional telemetry is off by default
Usage, performance, and compatibility statistics are optional categories that stay off until you turn them on. They use a resettable installation identifier that is not linked to your account.
You can see what is shared
A Privacy & Data Sharing page in the application is designed to show the exact next telemetry payload and the data recently transmitted, before and after it leaves your device.
Ownership
Buy it once. Keep using it.
A capable PDF editor should be within reach for everyone, everywhere. One low price, a perpetual licence, and no subscription.
Lambda PDF Basic
Launch price$39.99USD · one-time price · perpetual licence
Launch price. Lambda PDF Basic is coming soon; purchasing is not open yet.
What the licence includes- Licence
- Perpetual licence: pay once and keep using the version you buy. No subscription.
- Updates
- Keep using the version you buy for as long as you like. Updates within the same major version (for example, every 1.x release) are included; a later major version is a separate upgrade.
- Computers
- Activate on up to 2 computers with one licence.
- Offline use
- Activation is online, and the licence is then stored securely on your computer. Connect at least once every 14 days to keep editing features active; documents always remain viewable, printable, and savable.
Pay once
One price and a perpetual licence. There is no subscription, and nothing stops working when a billing period ends, because there isn't one.
Your files always open
Viewing, searching, printing, and saving never depend on a licence check, so your documents stay accessible whatever happens to your licence.
Works offline
Activate online once, then keep working offline. Editing features need an occasional online check; your documents never do.
Release status
Lambda PDF Basic is coming soon for Windows
The application is completing integration, persistence, rendering, performance, security, licensing, and release qualification.
Windows desktopQualification in progress
It cannot be downloaded or bought yet. Early-access registration is currently paused; the status panel will be updated when secure registration reopens.
Open and renderEdit and organizeAnnotate and fillSave and reopenActivate and licenseInstall and update
Release status REGISTRATION TEMPORARILY PAUSED
Secure early-access registration is currently paused.
Registration will reopen after the current secure-intake and privacy operations are complete.
Lambda PDF Basic is coming soon for Windows. No information can be submitted through this website while registration is paused.
FAQ
Questions, answered plainly
Lambda PDF Basic is a PDF editor for Windows from Eigenexis Systems. It views, edits, organizes, annotates, fills, signs, creates, optimizes, and protects PDFs, and it is designed to do that work on your computer.
$39.99 USD, once. That is a perpetual licence, not a subscription. Keep using the version you buy for as long as you like. Updates within the same major version (for example, every 1.x release) are included; a later major version is a separate upgrade.
No. You pay once and keep using the version you buy. There is no monthly or yearly fee.
Not for everyday PDF work. Opening, editing, merging, splitting, rearranging, annotating, compressing, signing, printing, and saving are designed to run locally. A document is only ever sent if you choose a specific file and confirm it in a separate, cancellable step.
One licence activates on up to 2 computers. Activation is online; after that it works offline, with a check at least once every 14 days to keep editing features active. Viewing, printing, and saving always work.
No. Lambda PDF Basic edits PDFs that already contain text. It does not recognize text in scanned images (OCR), and it does not include CAD or engineering measurement tools.
Lambda PDF Basic is coming soon for Windows. It cannot be downloaded or bought yet, and early-access registration is currently paused. The price is published now so you can plan.