What's new in Cella PDF

• Rasterize Sheets. File ▸ File Tools ▸ Rasterize Sheets… turns sheets with very dense linework and fills into a picture, so they open and pan at once in any viewer. Choose the sheets, the whole sheet or a region you drag, and 150, 300 or 600 dpi; text stays searchable and markups stay live. It saves a copy unless you choose to replace the sheets. Watch 0:13
• Move a measurement's value. Drag the value of an area, perimeter, length, angle, radius, volume or count anywhere, even outside the shape; a thin leader shows what it measures, and Reset Label Position puts it back. Watch 0:09
• Choose your stamp while you work. With the Stamp tool on, pick the stamp to place from the bar under the toolbar, or press [ and ] to step through your stamps. Watch 0:11
• Bold, Italic and Underline keys. ⌘B, ⌘I and ⌘U (Ctrl+B, Ctrl+I and Ctrl+U on Windows and Linux) for text boxes and callouts, while you type or with them selected, and underline and strikethrough as text styles that other PDF apps show too. Watch 0:10
• Eraser modes. Whole Markup erases any markup the eraser touches; Part of Stroke trims just the part of a pen or highlighter stroke you pass over; Size sets how wide it is. Watch 0:10
• A freehand Highlighter. It draws like a highlighter pen in open areas, follows the words when you start on text, and lets the drawing show through. Watch 0:10
• Constrain to Ruler. With the Scale Ruler's Constrain on, Pen and line strokes stay parallel or square to the ruler anywhere on the sheet. Stretch the ruler by an end, double-click to turn it 90°, triple-click to reverse it; its marker snaps to round numbers and to the drawing. Watch 0:13
• Snapshot to the clipboard. Drag round an area and it is copied, drawing and markups, as a sharp picture: click where it goes, or paste it on another sheet, in another document or in any other app. Watch 0:09
• Another Sheet Like This. Sheets ▸ Another Sheet Like This adds the next sheet of the same letterhead, form or graph paper, without its markups. Watch 0:08
• Triangle and Protractor. A set square and a protractor over the drawing beside the Scale Ruler: draw along their edges, slide the triangle along the ruler for parallel and square lines, and read or set angles with the protractor's arm. Watch 0:13
• Pen types. Technical Pen, Fineliner, Pencil, Marker, Charcoal and Brush Pen, each remembering its own width, colour and opacity; saved PDFs look the same in any app. Watch 0:13
• Stencils. 88 ready-made people, trees, furniture, fixtures, doors, cars and drafting symbols that land at their real size in the sheet's scale, and your own selection saved as a stencil to share with the office. Watch 0:13
• Hatches. Brick, Concrete, Insulation, Crosshatch and fifteen more patterns beside the fill, with scale, angle, colour and weight; materials come out at their real size on a scaled sheet. Watch 0:11
• Photos on a markup. Attach photos to any note, callout, cloud or measurement; a camera badge shows how many, and the photos travel inside the PDF. Watch 0:11
• Site Items and the Site Report. Site Item pins the next numbered item and takes its photos, note and status in one step; Site Report turns the items into a numbered report with each item's place on the sheet, its photos and its status. Watch 0:14
• Trace Paper sheets. Merge sheets, duplicate them, copy or move them to other pages and documents at real size, lock them, show one alone, and export a sheet as its own PDF. Watch 0:14
• Take the Tour. Seven quick steps on the sample sheet show how to open a set, mark up, measure and find any command, with one-line tips the first time they help. Watch 0:14
• A loupe for touch screens. A loupe above your finger shows the point you are placing, magnified, with its snap; where markups overlap, a tap offers the others.

• Rasterize Sheets
• Move a measurement's value
• Choose your stamp while you work
• Bold, Italic and Underline keys
• Eraser modes
• A freehand Highlighter
• Constrain to Ruler
• Snapshot to the clipboard
• Another Sheet Like This
• Triangle and Protractor
• Pen types
• Stencils
• Hatches
• Photos on a markup
• Site Items and the Site Report
• Trace Paper sheets
• Take the Tour

• Copy and paste markups. Cut, Copy and Paste for markups, between sheets, documents and tabs: Paste lands at the pointer, and Paste in Place puts them exactly where they were. Watch 0:11
• Layers panel. Add, rename and delete markup layers, show, hide and lock them, choose the layer new markups go on, and filter the Markups List by layer. Watch 0:12
• Scale Ruler. A see-through ruler over the drawing that reads in the sheet's scale: drag it, turn it, snap its zero to the drawing and draw straight along its edge. Watch 0:12
• Add to Count. Pick up a count you started earlier and carry on numbering. Watch 0:10
• New Tab. Opens the Welcome window with your recent documents and sets; what you open becomes the new tab. Watch 0:11
• Previous View and Next View. Go back and forward after following a link, a bookmark or a search result. A link to another file opens it in a new tab. Watch 0:12
• Combine open documents. Combine Files can add the documents you already have open. Watch 0:13
• Dock any panel. Every floating panel has a Dock button, Dock All Panels puts them all back, and on the Mac and Windows you can drag a panel to the window's edge to dock it. Watch 0:13
• Paper styles. Insert Blank Page offers Grid, Lined and Dot grid paper. Watch 0:11
• AI assistants edit their own markups. Move, reword, restyle and delete them, set callout leaders exactly, use your Tool Chest looks, and preview where markups would land before you approve.
• Drafts from an assistant. Approve once and the assistant's markups collect on a draft layer; Accept All or Discard from the band at the top of the window. Watch 0:13
• AI assistants read more of the set. A sheet or a whole set as plain text, where search results and markups are, what a markup would cover, clear space for notes, and leaders snapped to drawn lines.
• Keynotes in Check Set. Check Set flags keynote tags that are missing from a sheet's keynote legend.

• Copy and paste markups
• Layers panel
• Scale Ruler
• Add to Count
• New Tab
• Previous View and Next View
• Combine open documents
• Dock any panel
• Paper styles
• Drafts from an assistant

• Cloud Callout. A revision cloud and a note pointing at it, as one markup: drag the cloud, click where the note goes and type. Move the note and only the note moves; move or resize the cloud and the leader follows. Cloud-and-note markups made in other PDF markup apps open as cloud callouts and save back the same way. Watch 0:10
• Add a leader in one step. Right-click a callout ▸ Add Leader: the new leader's tip follows the pointer and the next click puts it there. Watch 0:10
• Set as Default for Tool. Right-click a markup ▸ Set as Default for Tool, and the next markup you draw with that tool looks like it; Reset Tool Defaults puts the tool back. Watch 0:12
• Select several sheets. Shift-click, Ctrl-click (⌘ on the Mac) or Ctrl+A in the thumbnails, then delete, extract, turn or drag them together, each one step of Undo. Watch 0:13
• Sheet Labels from Title Block. Box the sheet number and title on one title block: every sheet is read in the same places, listed for you to check and edit, then named and bookmarked "Number - Title". Watch 0:15
• Stamps from a PDF. Create Stamp… takes a PDF page as well as a picture; it stays sharp at any zoom and in print, and is stored once however many times you place it. Watch 0:13
• Open the document's folder. File ▸ Show in Finder on the Mac, File ▸ Open Document Folder on Windows and Linux (also on a tab's right-click menu). Watch 0:09
• Settings in the command palette. Type part of a setting's name, such as "dark" or "autosave", and go straight to it. Watch 0:11
• Appearance. View ▸ Appearance ▸ Match System, Light or Dark for the whole interface, with the drawing left as it is. Watch 0:09
• Mouse wheel zoom. Even steps about the pointer with a stop at Fit Page, and a Mouse wheel setting that makes a plain turn of the wheel zoom. Watch 0:11
• Thumbnails and toolbar at the sides. View ▸ Layout puts the thumbnails or the toolbar at the left or the right. Watch 0:11
• Split View with two documents. The second pane can show another open document; click a tab and the pane you are working in shows it, and Swap Panes trades them. Watch 0:12

• Cloud Callout
• Add a leader in one step
• Set as Default for Tool
• Select several sheets
• Sheet Labels from Title Block
• Stamps from a PDF
• Open the document's folder
• Settings in the command palette
• Appearance
• Mouse wheel zoom
• Thumbnails and toolbar at the sides
• Split View with two documents

• Resubmittal Report. File ▸ Set ▸ Resubmittal Report… writes the plan reviewer's response for you: a cover, what changed on each sheet since the last submission with a before-and-after picture of every change, and the reviewer's numbered comments answered, typed in or read from the reviewer's marked-up PDF; the responses as an Excel workbook too. Watch 0:14
• Open and save where your firm keeps its sets. Dropbox, OneDrive and Google Drive, from File ▸ Open from Cloud…, Open Set from Cloud… and Save to Cloud…; Save uploads a new version after saving on your computer. Sign in through the service's own page in your browser. Watch: Dropbox, OneDrive and Google Drive 0:12 Watch: Cloud sets 0:14 Watch: Saves that go back up 0:12
• Seal Set. A seal preset (your seal and signature pictures, licensee and licence number, the jurisdiction's statement, where it goes in the title block, the certificate to sign with) applied to the chosen sheets of a document or a whole folder set (all, a range, a sheet-number pattern such as A-*), in place or as copies; each file signed digitally once, and a verification page listing the sealed sheets. Document ▸ Seal Set… and Seal Presets… Watch 0:13
• Send to Client. One copy of the drawing with only what the client should see: tick what goes (comments and replies, statuses, authors, dates), leave out Rejected markups or whole layers, and flatten the rest into the sheets or keep it editable. What you leave out is taken out of the file, not hidden; the original is untouched. Watch 0:13
• Presentation mode. Full screen for the meeting: the sheet fitted, a laser pointer under the mouse that never becomes a markup, arrow keys between sheets, type a sheet number to jump, Esc to leave. Watch 0:13
• Check the set before issue. Document ▸ Check Set… reads every sheet of the document or the folder set and lists callouts that point at sheets not in the set, duplicate and skipped sheet numbers, sheets missing from the drawing index, revision triangles with no schedule entry and the unresolved markups on each sheet, each an Error or a Check a double-click from its place. Ignore what's fine, run it again after fixing, and export the report as a PDF, Excel or CSV. Watch 0:13

• Resubmittal Report
• Dropbox, OneDrive and Google Drive
• Cloud sets
• Saves that go back up
• Seal Set
• Send to Client
• Presentation mode
• Check the set before issue

• Right-click menus everywhere. Right-click a sheet in the Sheets strip to rotate, move, insert, extract or delete it, and a row in the Markups Table for the markup's commands.

• Callouts that keep their point. Drag a callout's box and its arrow stays on the same spot; right-click to add more leaders. Watch 0:14
• Autosize Text Box. Fit a text box or callout to its words with one key. Watch 0:10
• A better pen. Smooth strokes that follow pen pressure, Steadying for a shaky hand, a pause to straighten a stroke into a line, and your favourite pens on keys 1 to 9. Watch 0:15
• Ortho at any angle. F8 keeps lines straight, and a sheet can have its own angle for a skewed plan. Watch 0:12
• The Markups Table. Every markup in a wide table along the bottom of the window: sort, filter and arrange the columns, and save it as a view. Watch 0:14
• Trace Paper. See-through sheets over a drawing to sketch on, each its own PDF layer you can name, stack, show or hide. Watch 0:12
• Compare what's open. Compare Documents and Compare With offer the PDFs you already have open. Watch 0:11
• Zoom to extents. Double-click the middle mouse button to see the whole sheet, as in CAD. Watch 0:08

• Callouts that keep their point
• Autosize Text Box
• A better pen
• Ortho at any angle
• The Markups Table
• Trace Paper
• Compare what's open
• Zoom to extents

• Your own approval stamp. Turn a PNG or JPEG of your firm's stamp or logo into a stamp, in its own colours. Watch 0:13
• Place PDF. Lay a consultant's drawing over your sheet, then move, scale, tint and fade it. Watch 0:13
• Offset. Copy lines, shapes and areas a set distance away. Watch 0:10
• Borderless text. Turn off a text box's outline, on screen and in the saved PDF. Watch 0:10
• Open pictures. A PNG or JPEG opens as a one-sheet drawing, ready to mark up. Watch 0:11

• Your own approval stamp
• Place PDF
• Offset
• Borderless text
• Open pictures

• Snapshot on the Mac. Drag round part of a sheet to copy it as a picture you can move. Watch 0:12

• Snapshot on the Mac

• AI assistants. Let an assistant such as Claude Desktop or Claude Code read your open drawings and suggest changes you approve one at a time. More. Watch 0:10

• AI assistants

• Markup and measurement. Clouds, callouts, stamps, and calibrated lengths, areas and counts.
• Quantity takeoff. Automatic totals, unit costs and Excel export. Watch 0:12
• Compare revisions. Cloud every change between two issues, or a whole set. Watch: Overlay Pages 0:13 Watch: Detect Revisions 0:14
• Scans and signatures. OCR, Edit Text, Visual Search and digital signatures. Watch: OCR for scans 0:14 Watch: Digital signatures 0:10
• Real-time collaboration. Share markups live with Atrium.

See all the tools, each with a video →

• Quantity takeoff
• Overlay Pages
• Detect Revisions
• OCR for scans
• Digital signatures