Draw what
you mean.
Walls with thickness. Doors with swing. Windows with width. Place building elements, then refine the details.
THE PDF WORKSPACE FOR ARCHITECTS & ENGINEERS
PDF markup
and drawing takeoff.
Made clear.
Cloud a change. Check a measurement. Send a clear review.
Redline PDF brings drawing review, editing and takeoff into one focused workspace.
30 days of Pro No credit card Free plan afterward
- A+SSL Labs: grade from Qualys SSL Labs, checked 8 October 2026 (opens in a new tab)
- AES-256Encrypted at rest: drawings are encrypted with AES-256-GCM and sealed to your account
- EU hostedFrankfurt, Germany: the service, its database and your stored drawings are in Frankfurt, Germany
- No trackersNo ads or tracking cookies: no ads, no tracking cookies and no third-party trackers on Redline’s pages
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 demo →
- 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 that export are part of Plus and Pro, and of the 30-day trial (plans and prices).
● A focused drawing workspacePDF IN → CLEARER DECISIONS OUT
Illustrative apartment workspace — explore Review, Measure and Build above. Try the real editor on a sample drawing
A SIMPLER WAY TO WORK
How drawing review works.
Less back and forth.
Explore the sample first, then start your trial to work with your own PDFs.
See product features and limits →- Open and orient. Upload a PDF in your trial workspace. Calibrate each sheet against a known dimension before measuring.
- Make the review clear. Add clouds, callouts and measurements. Organize the markup list by subject and status. Reopen saved drawings to continue editing.
- Issue the result. With a trial or subscription, export editable PDF annotations, a flattened PDF or CSV quantities. Check the output before issuing it.
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
START FREE. CHOOSE WHAT FITS.
PDF takeoff software pricing.
Priced for one person.
Free for review markup, Plus for clean review sets with length and area, Pro for full takeoff. Every account starts with 30 days of Pro, no card. Then Free unless you choose Plus or Pro; your drawings stay. The Revu 20 switch offer runs for accounts opened by 31 January 2027.
No card is taken, so the trial ends without charging you. Taxes and the exact amount in your currency are shown at checkout, before you confirm.
Compare the plans in fullRedline and Bluebeam RevuRedline and Adobe Acrobat
Redline Free
AFTER THE TRIAL$0for as long as you like
No card, ever
- Clouds, callouts, text, stamps and pen
- Reads the markups already in a PDF
- Up to 3 saved drawings · 2 GB storage
- Flattened PDF with a small footer
Starts with 30 days of Pro. Stay on Free afterward without paying.
Redline Plus
FOR REVIEW SETS$9USD / month
Billed $9 monthly · $108 over 12 months
$90USD / year
Billed $90 yearly · equivalent to $7.50 a month
- Everything in Free
- Clean and editable PDF exports
- Calibrated length and area
- Printing and the markup summary
- Revision compare and page tools
- Up to 25 drawings · 2 GB storage
Counts, volumes, building elements and the CSV are on Pro.
Redline Pro
30 DAYS FREE$15USD / month
Billed $15 monthly · $180 over 12 months
$150USD / year
Billed $150 yearly · equivalent to $12.50 a month
- Everything in Plus
- Counts, volumes and deductions
- Dynamic Fill and building elements
- CSV, estimates and material rates
- Editing the PDF’s own content
- Unlimited drawings · 2 GB storage
No card to start. When the trial ends you keep Free, or choose a plan.
Every plan includes 2 GB of workspace storage, including saved versions. PDFs can be up to 300 MB each. Prices are USD; taxes and the final charge are shown at checkout.
What happens when my trial ends?
No automatic charge. Your account becomes Free unless you choose and pay for a plan. Signing up does not start a paid subscription.
Your drawings stay. If you saved more than 3 during the trial, you keep them and can continue reviewing them. Free limits adding new drawings; it does not delete your work.
Upgrade when the work needs it. Plus adds clean or editable exports, printing and calibrated length and area; Pro adds full takeoff and PDF content editing. Cancel a paid plan from your workspace; access continues for the period already paid for.
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. Sold to one person, not per seat to a firm.
- 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. The demo uploads nothing 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 including the free one.
- Export
- PDF with editable standard annotations that Acrobat and other professional PDF tools open and edit, flattened PDF, CSV of quantities and markups for Excel, markup summary with subtotals, and printing to scale.
- Price
- Free plan at $0. Plus at $9 a month or $90 a year, for review sets with length and area. Pro at $15 a month or $150 a year, for full takeoff. Per person. Every account begins with 30 days of Pro, no card.
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Try your actual workflow
Use the sample demo on your preferred browser and device. Start a trial to check your own PDFs, saving and exports. A desktop gives precise takeoff work more room.
A person you can reach
Contact Redline PDF support, or send feedback from Help in the app. Read patch news to see what changed.
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 actually 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: Free, Plus at $90 or Pro at $150 a year | Per seat, per year, usually in tiers | Free, or a low general 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.
- 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 online, freeOpen your own drawing, set its scale and measure it here, with nothing to sign up for.
- Quantity takeoff from a PDFA worked flooring, skirting and fixture example, from calibration to CSV.
- All guidesMac, iPad, deleting content, one-person review, and the comparisons with other tools.
BEFORE YOU DRAW THE LINE
PDF markup and takeoff,
answered.
Still deciding? The demo opens on a sample drawing with every tool unlocked — no account, nothing to install, nothing to undo afterwards.
A question that is not here? Write to us and a person answers.
Can I try it without signing up?
Yes. The demo lets you try the tools on a sample drawing, with no account or email. Demo changes are temporary. Opening your files, saving signatures and drawings, exporting, printing and downloads are part of an account, so start the 30-day trial when you want to take the finished work with you.
Will it work with the tools my colleagues use?
Yes, in both directions. Redline exports standard PDF annotations, which professional PDF tools open and edit, and it reads the annotations already in a PDF someone sends you — so their clouds and comments become markups you can answer, restyle or delete.
Can I use Redline today?
Yes. Create an account and you have 30 days with every tool, no card needed. Your drawings are saved to your private workspace, and you can download them at any time — during the trial and after it.
Who is Redline built for?
Architects, engineers and drawing reviewers who need to annotate PDFs, check dimensions, count items and communicate design changes.
What can I export?
Plus and Pro include editable PDF annotations, clean flattened PDFs, the markup summary and printing to scale, and Pro adds CSV markup and quantity reports; the trial includes all of it. Free includes flattened PDF export 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 and the trial export 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.
YOUR NEXT REVIEW STARTS HERE.
Make room
for better work.
- A+SSL Labs: grade from Qualys SSL Labs, checked 8 October 2026 (opens in a new tab)
- A+Mozilla Observatory: grade from Mozilla HTTP Observatory, checked 8 October 2026 (opens in a new tab)
- AES-256Encrypted at rest: drawings are encrypted with AES-256-GCM and sealed to your account
- EU hostedFrankfurt, Germany: the service, its database and your stored drawings are in Frankfurt, Germany
- Certified hostingRender’s ISO 27001, SOC 2: hosted on Render, whose ISO 27001 certification and SOC 2 Type 2 report are Render’s own
- No trackersNo ads or tracking cookies: no ads, no tracking cookies and no third-party trackers on Redline’s pages