Mark up technical PDF drawings online

Put feedback where it belongs

Technical drawing comments are easier to understand when they are attached to the thing being discussed.

Instead of writing “see area near the upper-left equipment foundation” in an email, place the markup directly on that area of the drawing and add the explanation beside it.

The markup gives the comment a location, the comment explains the issue, replies keep the discussion together, and the status shows where it stands. That turns a PDF markup from a static annotation into part of the review workflow.

Mark up the drawing visually

Different comments need different ways of being shown.

Xenmark provides markup tools for identifying areas, drawing attention to specific details and adding written feedback directly to the PDF.

For quick visual checks, symbols can communicate simple outcomes without requiring a paragraph of text. Measurements can be added when the review depends on dimensions or distances shown on the drawing.

The goal is not to recreate a CAD application inside the browser. It is to give reviewers the tools they need to communicate clearly on the issued PDF.

Add comments alongside markups

A pin, rectangle or callout can show where the issue is, but the markup alone often does not explain why it matters.

Add a written comment to provide the detail behind the visual markup.

For example, a reviewer might mark a location and explain that access needs to be checked, a dimension appears inconsistent, a component should be moved or a detail needs clarification.

Keeping the written comment attached to the markup means another reviewer does not have to match a numbered spreadsheet row back to the correct position manually.

Add measurements when dimensions matter

Some review comments depend on size, spacing or distance.

Measurement tools let reviewers add dimensional context directly to the PDF drawing. Set the display units to metres, centimetres or millimetres, depending on the document and the way the team works.

Calculated values can also be overridden with manual input when the reviewer needs to show a specific value or note rather than the automatically calculated result.

That makes measurements useful as review annotations rather than treating them as final design data.

Use symbols for quick visual review

Not every point needs a long comment.

A symbol can be useful when the meaning is already understood by the review team: something has been checked, something needs attention, or a location should be highlighted quickly.

Symbols provide a faster visual layer while comments can still be used where a more complete explanation is needed.

Discuss the markup instead of creating another copy

Traditional PDF markup often ends when someone saves the file. The marked-up PDF is then emailed back, another person replies, and a second marked-up copy may be created.

Xenmark keeps the conversation around the original review item.

Participants can reply to a comment while its location remains visible on the drawing. That keeps discussion and context together and avoids turning every response into another document version.

Keep markups useful during the whole review

The most useful markup is not necessarily the one with the best drawing tools. It is the one that remains understandable while the project moves forward.

Xenmark lets comments be tracked as the review progresses, so a markup can move from an initial observation into a discussion and eventually into a resolved item. The same markups then carry into the next drawing revision rather than being left behind with the old PDF.

That is particularly useful when a drawing contains dozens or hundreds of review points.

Export comments when the review leaves Xenmark

Some projects still require a separate drawing comment register.

Xenmark can export review comments to Excel, and a comment plan PDF showing where each numbered comment sits, so the review can be used outside the application for reporting, records or coordination with another process.

You can use a modern shared review without losing the ability to hand over a conventional spreadsheet when required.

More than a standalone PDF annotator

If all you need is to draw a line on a PDF, there are many general-purpose PDF tools that can do it.

Xenmark is aimed at a different part of the problem: teams that need the markup to remain part of an organised drawing review.

The markup is the start of the conversation, not the end of it.