Draw what
you mean.
Walls with thickness. Doors with swing. Windows with width. Place building elements, then refine the details.
FOR ARCHITECTS, ENGINEERS, CONTRACTORS AND ESTIMATORS
PDF markup
and drawing takeoff.
In any browser.
Cloud a change. Check a measurement. Send a clear review.
Redline opens the markups already in your PDFs, measures on a calibrated sheet, and sends the set back as standard PDF annotations.
Includes a 30-day Pro trial. No card needed.
Opens the markups already in your PDFs, on every planWindows, Mac and iPadA+ on three public security scansHosted in Frankfurt
THE EDITOR ON THE SAMPLE DRAWING
Calibrated, measured,
and listed.
One length and two room areas, measured after calibrating to the printed 5 000 mm reference on sheet A101. Each one is a row in the markups list with its page, status, layer and value, ready to take out as CSV. Open the same sample in the editor →
- Calibrate. Enter the real distance between two points. Sheets plotted at the same scale can share it, and a page that already has a scale keeps its own.
- Measure. Draw a length and an area. Each lands in the markups list, and the status line keeps the running total.
- Export. Choose the pages, the markup layers and the output; here, editable PDF annotations. Calibrated length and area, and this export, come with Plus and Pro (plans).
HOW IT WORKS
From the set you receive
to the set you send.
See every feature →- Open and calibrate. Upload a PDF and calibrate each sheet against a dimension you know.
- Review. Clouds, callouts and measurements, sorted by subject and status.
- Issue. Standard PDF annotations, a flattened PDF, or the quantities as CSV.
LengthGrid 1 to 25 400 mm
CloudCheck door swingBedroom
AreaKitchen14.49 m²
CountWindows4
BUILT AROUND YOUR DISCIPLINE
02 / THE TOOLKITDraw what
Give systems
their space.
Columns, pipes, ducts and risers, with size controls that speak your language.
Every measure.
Accounted for.
Lengths, areas, volumes and continuous counts. Turn drawing details into quantities you can review.
NET AREA24.80 m²
PLANS
One price
per person.
Pro for full takeoff. Plus for review sets.
Compare the plans in fullRedline and Bluebeam RevuRedline and Adobe Acrobat
Redline Pro
FULL TAKEOFFFor estimators, quantity surveyors, contractors, and anyone who prices from drawings.
$150per person, per year
or $15 a month, billed monthly
$15per person, a month
or $150 a year, billed yearly
- Everything in Plus, and:
- Counts, volumes and deductions
- Dynamic Fill and building elements
- CSV, estimates and material rates
- Editing the PDF’s own content
- Unlimited saved drawings · 2 GB storage
Redline Plus
REVIEW SETSFor architects, engineers and consultants who review drawing sets, send them back clean and check lengths and areas on a calibrated sheet.
$90per person, per year
or $9 a month, billed monthly
$9per person, a month
or $90 a year, billed yearly
- Everything in Free, and:
- Clean exports and standard PDF annotations
- Calibrated length and area
- Printing and the markup summary
- Revision compare and page tools
- Up to 25 saved drawings · 2 GB storage
Redline Free: review markup, the markups already in your PDFs, 3 saved drawings and a flattened PDF export with a small Redline footer, for occasional reviewers. Create an account
Every plan includes 2 GB of workspace storage with saved versions, and PDFs up to 300 MB. Prices are USD; tax and the final charge are shown at checkout. Compare every feature.
THE SHORT VERSION
What Redline PDF is,
in plain terms.
Redline PDF is browser-based PDF markup and quantity takeoff software for architects, engineers, contractors and estimators. Drawings are rendered, marked up and measured in the browser itself; opening or uploading a PDF in your signed-in workspace saves it to your account automatically.
SPECIFICATION SCHEDULEREV 01
- What it is
- A browser workspace for reviewing, marking up and measuring PDF construction drawings. Licensed per person: one for yourself, or one for each reviewer in a practice. No installer and no administrator.
- Where it runs
- Chrome, Edge, Safari or Firefox on Windows, macOS, Linux, iPad and Android tablets. Nothing to install; installs as an app if you want it.
- Rendering
- Vector PDF rendering in the browser. Markup geometry stays vector, on screen and in the exported file.
- Where the work happens
- In the browser. Rendering, markup, measurement and export all run on your device. Opening or uploading a drawing in your signed-in workspace automatically saves it to your account, where it is encrypted at rest. Without an account, nothing is uploaded at all.
- Scale calibration
- Per page, by clicking a known distance or entering the drawn ratio. A page without one is marked “Scale not set” rather than guessed at.
- Measurement
- Length, polyline length, area, perimeter, volume, angle, radius and count. Deductions for openings. Dynamic Fill follows the walls of an enclosed room. Totals update as you draw.
- Counting
- Manual counts, or drag a box around one symbol and find matching symbols across a page range. Matches need the same printed size and orientation, and every match is reviewed before it becomes a count.
- Building elements
- Walls with thickness, doors with swing, windows with width, columns, pipes, ducts and risers, each carrying its size.
- Import
- PDF, up to 300 MB. Reads the annotations a PDF already carries, on every plan.
- Export
- PDF with standard PDF annotations, each carrying its own appearance; flattened PDF; CSV of quantities and markups for Excel; markup summary with subtotals; printing to scale.
- Price
- Pro, $150 per person a year or $15 a month, for full takeoff. Plus, $90 a year or $9 a month, for review sets. Redline Free for occasional review.
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Bring a real drawing.
Open one of your own sheets, calibrate it and measure a dimension you already know.
Support and releases.
Support by email from the team that builds Redline. 21 releases since 13 September 2026: release notes →
Drawings are private to your account and encrypted on the server. Read our privacy policy and refund policy.
How a browser tool compares
Three ways of working on a PDF drawing, and what each is for.
| What is being compared | Redline PDF | Desktop review suites | General web PDF viewers |
|---|---|---|---|
| Install | None. Opens in a browser | A Windows installer, usually an administrator | None |
| Runs on a Mac or iPad | Yes, the same toolset as anywhere else | Often Windows-first; a Mac edition may be narrower or discontinued | Yes |
| Scale calibration | Per page, with a second-dimension check | Yes | Rarely |
| Quantity takeoff | Lengths, areas, volumes, counts, deductions, live totals | Yes, often split across licence tiers | No |
| Quantities to CSV | Yes | Usually | No |
| Editable PDF annotations out | Yes, standard annotations | Yes | Comments only, if any |
| Sold as | Per person: Pro $150 or Plus $90 a year | Per seat, per year, usually in tiers | Free, or a general-purpose subscription |
Comparisons against particular products, with prices taken from each vendor’s own page and dated, are on the Revu comparison, the Acrobat comparison and the roundup.
GUIDES
Drawing review,
step by step.
- Bluebeam Revu 20 end of lifeBluebeam’s dates, what a perpetual licence keeps, and how markups move to Redline.
- Quantity takeoff from a PDFA worked flooring, skirting and fixture example, from calibration to CSV.
- PDF markup softwareWhat to check before you choose one: markup, editing, measurement and export.
- Construction drawing reviewA repeatable review of a drawing set, from the first cloud to the issued PDF.
- Calibrating a PDF drawing to scaleTwo ways to set the true scale, and why every sheet needs its own.
- Measuring area on a PDFA square-metre figure off a plan, with openings deducted and the perimeter alongside.
- Measure a PDF onlineOpen your own drawing, set its scale and measure it in the browser.
- All guidesMac, iPad, deleting content, one-person review, and the comparisons with other tools.
BEFORE YOU DRAW THE LINE
PDF markup and takeoff,
answered.
The sample drawing opens with every tool and no account.
A question that is not here? Write to support.
Can I try it without signing up?
Yes. The sample drawing opens in the editor with every tool, and no account or email. Changes there are temporary. Opening your own files, saving, exporting, printing and downloads are part of an account.
Will it work with the tools my colleagues use?
Redline reads the annotations already in a PDF someone sends you, on every plan, so their clouds and comments become markups you can answer, restyle or delete. Plus and Pro send the set back as standard PDF annotations, not flattened ink.
Can I use Redline today?
Yes. A new account has every Pro tool for the trial. Your drawings are saved to your private workspace, and you can download them at any time.
Who is Redline built for?
Architects, engineers, contractors, estimators and drawing reviewers who need to annotate PDFs, check dimensions, count items and communicate design changes.
What can I export?
Plus and Pro export standard PDF annotations, clean flattened PDFs, the markup summary and printing to scale, and Pro adds CSV markup and quantity reports. Redline Free exports a flattened PDF with a small footer.
Will my drawings be private?
Yes. A drawing is stored under your account only, encrypted on the server and never visible to another account. The editor can also keep a copy on your own disk. This page takes no uploads — your workspace does.
Does my drawing get uploaded to a server?
Yes, when you open or upload a PDF in your signed-in workspace, it is automatically saved to your account. Rendering, markup and measurement run on your device. Stored drawings are encrypted under your account and are not visible to other accounts. The demo uploads nothing at all: it runs entirely in the browser and its changes are temporary.
How accurate are measurements taken from a PDF?
A measurement is exact arithmetic on the points you place, at the scale you set — so its accuracy is decided by the calibration and by where you click. Calibrate each page against a dimension you know, then check a second known dimension before taking quantities. On a scanned sheet the paper itself may have stretched; treat small discrepancies as that sheet’s noise rather than a fact about the building. How to calibrate a drawing.
Can it count symbols automatically?
It can find them for you, and then you check them. Drag a box around one symbol and Redline PDF searches a page or a range of pages for matches of the same printed size and orientation, at a match threshold you set. Every result is reviewed page by page before it becomes a count — an unreviewed automatic count is not a quantity anyone should price from.
Can I get quantities into Excel?
Yes. Pro exports a CSV carrying every measurement with its subject, its space and the unit it is reported in, which opens directly in Excel or any spreadsheet. A markup summary with subtotals by subject can also go out as a PDF for the record.
Can I see prices in my own currency?
Prices are in USD. At checkout you see an estimate in your local currency and the exact amount, including tax, before you confirm anything.
GET STARTED
Bring your next
drawing set.
Open it, calibrate it, review it and send it back.
Get started →Runs in your browser on Windows, Mac and iPad. Nothing to install.
