Desktop · Lite · Max · Ultra X27

PDF for every level.

Edit, convert, sign and organise PDFs — locally and offline.

Three editions

Lite, Max, and Ultra X27.

Lite is free inside Culltron OS. Max is the professional paid edition. Ultra X27 is the flagship — a strict superset of Max with Aria AI.

Lite · in OS

PDF Lite

✓Read, search & annotate

✓Merge, split & reorder

✓Fill simple forms

✓Free in Culltron OS

Max · paid

PDF Max

✓Everything in Lite

✓Edit text & images in-place

✓Convert to/from Office formats

✓OCR scanned documents

✓Sign & redact

Flagship · AI

Ultra X27 · flagship

PDF Ultra X27

✓Everything in Max

✓Aria extract & summarise

✓Batch convert & OCR queues

✓Smart form data capture

✓Local / BYOK / Cloud AI

PDF Lite is bundled with Culltron OS and is not sold separately. Aria AI is an Ultra X27 feature.

What you get

Built to do real work.

Edit anything

Change text, images and layout directly in the PDF — no conversion round-trip.

Convert cleanly

To and from Office formats, images and more, with layout preserved.

OCR built in

Turn scans into searchable, selectable text — batch it in Ultra.

Sign & redact

Add signatures and permanently remove sensitive content.

Aria document IQ

In Ultra, ask Aria to extract, summarise and answer across long PDFs.

Local & offline

Your documents never leave your machine. Signed offline lease.

Editions

PDF Max, and PDF Ultra X27.

Max is strong paid software. Ultra X27 adds Aria AI and advanced workflows — the flagship edition, not a bundle.

CapabilityMaxUltra X27

Read, annotate, merge & split ✓ ✓

Edit text & images ✓ ✓

Convert & OCR ✓ ✓

Sign & redact ✓ ✓

Aria extract & summarise — ✓

Batch OCR & convert queues — ✓

Local / BYOK / Cloud AI — ✓

Get PDF

Get launch access. Choose the edition that fits.

Culltron OS includes its verified core local apps. This Max product is available only after its signed release artifact is approved; Ultra X27 adds entitled Aria workflows.

Review release status Compare editions

PDF Max in depth

PDF Max

A local PDF workstation. Nothing is uploaded unless a separate connected workflow says so explicitly.

A viewer with page thumbnails, zoom, rotate, jump, keyboard navigation and text search.
Organise, rotate, delete, crop and extract exact page ranges. Merge files, turn images into a PDF, export pages to PNG and extract text.
Edit metadata and add watermarks and page numbers.
Inspect and fill AcroForm fields, author fields after review, and optionally flatten. Add bookmarks and page labels.
Local preflight checks for structure, accessibility and print, plus bounded OCR to create searchable copies.
AES-256 password encryption and authorised decryption, available when qpdf is installed. Each change writes a separate copy and a receipt.

Ultra X27: adds stamps, presets for watermarks and page numbers, appearance-only signature marks, metadata cleaning, three lossless optimisation profiles, batch merge/split/watermark/numbering, and document binders.

Limits: Production edits refuse dynamic XFA forms and PDFs that already carry signatures rather than silently invalidating them. Signature marks are visual and are not digital signatures.

How it works

It is a separate desktop product on Culltron's shared, hardened platform, with its own full editor and local workspace.
A local, authenticated runtime serves the editor. Your files stay on your machine.
A signed licence lease unlocks the paid edition, and Ultra X27 features are enforced by the server, not just hidden.
Changes write new copies, usually with checksum receipts, so originals are not overwritten.

Frequently asked questions

Does PDF Max work offline?

Yes. The core editor runs locally through Culltron's runtime on your own machine and keeps files in a local folder.

What does Ultra X27 add?

Ultra X27 adds stamps, presets for watermarks and page numbers, appearance-only signature marks, metadata cleaning, three lossless optimisation profiles, batch merge/split/watermark/numbering, and document binders.

What are the limits of PDF Max?

Production edits refuse dynamic XFA forms and PDFs that already carry signatures rather than silently invalidating them. Signature marks are visual and are not digital signatures.

Can I download PDF Max today?

Not yet publicly. Builds are tested, but a public download appears only after signing, checksum verification and release approval.

Release status: built and tested in the repository. A public download appears only after signing, checksum verification and release approval; see Downloads. Source of these facts: the product's engineering README.