PlanSync
Local-only in your browser. Markups and calibration save per file in local storage—clear from Document (info) in the top bar.
Free· construction & design PDFs
Open construction drawings, set scale, measure, and mark up—no cost, no account.
- Set scale from a known length on the sheet, then measure lines, areas, angles, or paths.
- Markup tools use the same blue accent as in the viewer (highlights, shapes, text).
- Undo works on markups and calibration; zoom, page, and drawings are remembered per file in this browser's local storage.
- After you open a file: export PDF with markups, a PNG of the current page, or markup JSON from the top bar.
Add your image at public/images/cta/gifcta.gif
What’s in the viewer
Measure, draw, calibrate
Same tools you use on real job PDFs: measure to scale, mark up for RFIs or field notes, calibrate from a known dimension. Replace the gray boxes with your own screenshots if you want—file names are listed under the cards.
feature-measure.png
Measure
Dimensions on the sheet
After calibration, place line lengths, areas, angles, or a multi-point path. Units follow the setting in the Measure panel.
feature-markup.png
Markup
Annotations on the PDF
Pen, highlighter, lines, shapes, clouds, and short text notes. Same blue styling as the tools in the left sidebar.
feature-calibrate.png
Calibrate
Match the print scale
Click two points on a known distance, enter that length in millimetres, then measure against the sheet.
Who it's for
Field and office
Owner / CM
Review shop drawings and submittals as PDFs without sending files to another app.
GC & supers
Check dimensions against site conditions; mark up RFIs and punch items from the same sheet.
Detailers & engineers
Calibrate scale, measure, and export marked PDFs or PNGs for internal records.
Inspectors
Zoom, search, and annotate without installing a desktop viewer.
FAQ
Common questions
- Is my PDF uploaded to the cloud?
- No. The file stays in your browser. Nothing is sent to this app's servers for viewing or markup.
- Where are markups stored?
- In this browser's local storage, keyed to the file name and page count. You can clear them from the viewer (Document → Clear) or from Settings.
- What can I export?
- PDF with markups (rasterized), PNG of the current page, markup JSON, measurement CSV from the right panel, and a full session JSON backup from Document.
- Does it work offline?
- After the app loads, you can work without a network; the PDF is already in memory. You need a connection to load the initial app shell.
- Supported PDFs?
- Standard vector PDFs work best. Very large or heavily protected files may need to be re-saved from your CAD or PDF tool.
Open another file
Same as above—drop a PDF or use the button.