Too many steps
A simple callout becomes a collection of lines, shapes, and text boxes.
Blazingly Fast and Buttery Smooth Mechanical Drawing Redlining
PDF Engineer is a PDF editor with intuitive, purpose-built tools for dimensions, GD&T, BOM balloons, weld symbols, and more, with hotkeys built specifically for engineers.
30-day free trial · No sales call or credit card required
See PDF Engineer at work
Keep your attention on the engineering
Engineering is complicated enough. Redlining shouldn’t be.
You spotted the tolerance issue. You know what needs to change. Communicating it should be the easy part.
The wrong tools
You need a mechanical symbol. Your editor gives you another generic shape.
Placement that takes patience
You spend more time adjusting the markup than explaining the change.
Your attention belongs on the drawing, not the editor.
From friction to flow
From engineering intent to a precise redline.
The right tools make room for what you do best: seeing the problem and making the next step clear.
01 /
See it. Mark it. Move on.
Build a GD&T feature control frame with the symbols, tolerances, and datums you need. Place a complete callout without assembling individual shapes.
02 /
Every mark, right where you want it.
Give the detail the attention it deserves. Place dimensions, leaders, and symbols with consistent sizing and precise control, so your intent is clear.
03 /
Redlines you’re proud to send.
Turn your review into clear, readable feedback. Show the feature, explain the change, and share a standard PDF your team and suppliers can open.
Purpose-built for mechanical engineering
Everything you need. Nothing in your way.
Engineering drawing redline software for design reviews, DFM feedback, ECO and ECR changes, supplier clarifications, and inspection notes.
Mechanical tools, built in
GD&T, dimensions, weld symbols, BOM balloons, flag notes, and centerlines. The marks you actually use for mechanical drawing reviews.
A clear view of what changed
Compare drawing revisions side by side. Inspect highlighted differences and added, removed, or replaced text before creating your redlines.
Fits your existing workflow
Keep document processing on your workstation. Export standard PDFs for your existing document-control, supplier, and release processes.
Drawing Comparison
A new revision. A clear view of what changed.
Compare revisions of engineering drawings side by side in PDF Engineer. See highlighted differences and a list of added, removed, and replaced text, so you can focus your review on the changes that matter.
Review revisions side by side
See the previous and updated drawings together so you can review each change in context.
See what changed
Highlighted differences help you spot revised dimensions, updated notes, and added or removed text.
Work through the differences
Use the comparison list to review changes as you check an ECO, supplier update, or new drawing revision.
A familiar problem. A focused solution.
Made for engineers.
By an engineer.
PDF Engineer began with a frustration experienced firsthand: creating a mechanical drawing redline shouldn’t be harder than identifying the problem.
Shaped by 15 years of mechanical design engineering experience, every tool has a clear purpose: help you review drawings and communicate changes with less friction.
Read the story behind PDF EngineerSecurity
Your drawings. Your workstation. Your workflow.
PDF Engineer processes all drawings locally on your workstation. Engineering documents are never uploaded to external servers for rendering, markup creation, review, or export.
Internet connectivity supports account management, company seat administration, subscription validation, software updates, and support requests. Your drawings are processed on your machine, not in the cloud.
Local workstation processing
Rendering, markup creation, review, and export happen on your machine.
No drawing uploads
Engineering documents are not uploaded to PDF Engineer servers for document work.
Limited internet use
Connectivity supports account management, subscriptions, and updates.
Comparison
Mechanical callouts, ready when you need them.
Add GD&T frames, BOM balloons, and flag notes with tools built for mechanical drawing reviews.
Generic PDF Editors
PDF Engineer
Generic shapes & text boxes
Native BOM, GD&T, flag notes
Multi-step symbol formatting
One-click mechanical tools
UI built for documents
UI built for drawings
Cluttered, bloated menus
Focused, fast workflow
Image Markup
Not just for PDFs. Paste a screenshot and mark it up.
When feedback starts as a CAD screenshot, inspection photo, shop-floor image, or clipped drawing detail, paste it into PDF Engineer and use the same leaders, notes, symbols, and callouts you use on PDFs.
No conversion step
Same markup tools
Fast visual feedback
CAD screenshots
Mark a detail from a model or drawing view before someone exports a formal PDF package.
Inspection photos
Call out a tolerance issue, fit concern, or measured feature directly on the image at hand.
Clipped drawing details
Paste the small part of a drawing that needs attention and send a focused redline quickly.
Mechanical drawing reviews
From design review to supplier feedback.
From first design review to released manufacturing drawing, PDF Engineer helps mechanical, manufacturing, quality, and supplier teams communicate changes clearly.
One drawing. Every review team.
Design Engineering
Flag a missing datum, question a tolerance, or reconcile a BOM balloon before the drawing is released.
Manufacturing Engineering
Clarify an assembly note and capture producibility issues or shop-floor feedback directly on the drawing.
Quality & Inspection
Document tolerance issues, nonconformances, inspection findings, and required drawing changes.
Supplier Collaboration
Send suppliers clear PDF redlines showing the feature, dimension, or drawing note that needs clarification.
ROI calculator
Estimate the cost of slow drawing reviews
See how much engineering time and labor cost your team could recover with a faster redlining workflow.
Step 1
Your drawing-review team
Labor baseline
$
Step 2
Your expected efficiency gain
Not sure? Start with 20%.
20%
5%50%
This is an estimate only. PDF Engineer does not guarantee a specific savings percentage.
Step 3
PDF Engineer cost
$
Defaults to the current annual plan price.
Advanced assumptions
PDF Engineer ROI Estimate
$18,277
Estimated annual net savings
288
hours reclaimed each year
1,015%
estimated first-year ROI
1.1 months
estimated payback period
0.1 FTE
capacity recovered
Gross labor savings
$20,077
Annual software cost
$1,800
Equivalent to recovering 0.1 full-time employees of engineering capacity.
Based on:
- 6 reviewers
- $145,000 average fully burdened employee cost
- 5 hours per reviewer per week spent on drawing reviews
- 20% estimated efficiency improvement
- 6 PDF Engineer licenses
Estimates are based on the information provided and are intended for planning purposes. Actual savings will vary based on workflow, adoption, and usage.
Plans & Pricing
Simple pricing
Test every feature on your own drawings for 30 days. Then choose one simple paid subscription per user.
30-day free trial
$25$25
per month, per user when billed annually.
Start 30-day trial
Use your own drawings and workflows. Every feature is included.
Already evaluated it? Subscribe now.
Education Access
Free for engineering students and educators
PDF Engineer is free for students, professors, instructors, and university labs with a valid .edu email address. Download the app and use the in-app education flow for mechanical drawing markups, GD&T redlines, capstone reviews, and class projects without paying for a subscription.
Frequently Asked Questions
Questions from mechanical teams evaluating PDF Engineer.
Clear answers before you roll it out.
Clear answers before you roll it out.
Engineering drawing redline software lets reviewers add visible drawing annotations, questions, and proposed changes to technical drawings. PDF Engineer focuses on mechanical drawing review with tools for GD&T feature control frames, dimensions, BOM balloons, flag notes, weld symbols, centerlines, and arrows.
Open your drawing PDF in PDF Engineer, review the details, and place notes, leaders, symbols, and callouts at the features that need attention. Save a .pdf-eng project to keep your work editable, then export a standard redlined PDF to share through your existing review process.
Yes. PDF Engineer lets you compare drawing revisions side by side with highlighted differences and a list of added, removed, and replaced text. Use the comparison tool to review changed dimensions, updated notes, and other text changes during ECO reviews, supplier updates, or revision checks.
Yes. PDF Engineer includes native GD&T tools for creating feature control frames and placing them on engineering drawings with leaders. You can communicate tolerance and datum feedback without assembling frames from generic text boxes.
Yes. BOM balloons and flag notes are built-in mechanical markup tools. Use them with leaders and drawing annotations to identify assembly items and call attention to review notes directly on the drawing.
Drawing rendering, markup creation, review, and export happen locally on your workstation. PDF Engineer does not upload engineering documents to external servers for those operations. Internet connectivity supports account management, company seat administration, subscription validation, updates, and support requests.
Download PDF Engineer and test every feature for 30 days using the drawings and review workflows your team already works with. Your drawing files stay on your machine throughout the trial.
PDF Engineer focuses on mechanical drawing redlines with native GD&T feature control frames, BOM balloons, flag notes, and other engineering annotations. Choose it when these tools fit your daily drawing reviews, and keep Acrobat or Bluebeam for other document workflows your team needs. Exported standard PDFs open in either viewer.
Yes. PDF Engineer exports standard PDF files that open in major viewers such as Acrobat, Bluebeam, and the document viewers used inside many PLM workflows.
Yes. You can paste an image file or screenshot into PDF Engineer and use the same markup tools you use on PDFs, which is useful for quick CAD views, drawing details, inspection photos, and shop-floor feedback that does not need a full PDF package.
Usually no. Most teams review drawings in PDF Engineer and then attach the redlined PDF back into their existing PLM, ERP, or document control process.
A .pdf-eng file is a project file for editable work in PDF Engineer. It preserves annotations and review state while letting teams export a standard PDF when they are ready to share or release.
Yes. PDF Engineer uses simple per-user licensing with monthly and annual billing options.
Yes. PDF Engineer is free for students and educators with a valid .edu email address, including engineering students, professors, instructors, and university labs that need a PDF editor for mechanical drawing markups.
Mechanical design, manufacturing, supplier quality, and product development teams use PDF Engineer for ECO and ECR reviews, DFM feedback, supplier clarification packages, and inspection markups.
No. PDF Engineer from getpdfengineer.com is a Windows desktop application for mechanical engineering drawing review, published by PDF Engineer and available through the Microsoft Store. It is not affiliated with the separately developed Chrome extension also named PDF Engineer.
Make your next redline a pleasure
You’ll know the difference with your first redline.
Open a drawing. Place a few annotations. Experience what engineering redlines should feel like.
Start Your Free 30-Day TrialEvery feature included. No credit card required. Your drawings stay local.