Guides/Block attributes
Batch Update Title Block Attributes Across Multiple AutoCAD Drawings
Made with BlockSyncUpdated September 17, 2026
A title block attribute rarely changes on just one sheet. A project moves to a new revision, a client name changes, an address gets corrected — and now the same field needs the same fix on every drawing in the set.
AutoCAD doesn't have a built-in way to do this across files. ATTEDIT and the Properties panel only touch one block reference at a time, and DATAEXTRACTION exports data out but can't write edited values back in. That leaves opening each drawing, double-clicking the attribute, retyping it, and saving — which is slow and easy to get wrong on drawing 140 of 150.
This guide uses BlockSync to export the title block attributes from a batch of drawings to Excel, edit them there, and write the changes back with a preview of exactly what will change before anything is touched.
1. Export the title block attributes to Excel
Open BlockSync and add the drawings you need to update — Add Files… for a specific set, or Add Folder… to pull in everything under a folder. BlockSync scans each file and lists every block definition it found, with how many times it's referenced and how many files it appears in.
On the Blocks tab, check the title block definition (here, ARCHBDR-D) and leave the rest unchecked — only checked blocks are included in the export, so the workbook stays focused on the fields you actually need to touch.
Click Extract to Excel. BlockSync writes one row per block instance, across every file, to a timestamped workbook in the output folder shown on screen.
2. Edit the values in Excel
The exported sheet has one tab per block, with system columns (_File, _Handle, _Block) on the left and one column per attribute tag on the right — here, DATE, NAME, PROJECT and TITLE.
Edit the attribute columns directly, the same way you'd edit any spreadsheet: type new values, paste a column from another sheet, or use a formula to derive one field from another. Don't touch _File or _Handle — that's how BlockSync matches each row back to the exact block instance it came from when it writes the changes back.
Save the workbook when you're done.
3. Preview the changes before writing anything back
Switch to the Excel → AutoCAD tab in BlockSync. Point it at the edited workbook and the folder holding the drawings — files are matched back to the workbook by exact file name, so there's no manual re-linking step.
Leave Enable automatic backup checked. BlockSync copies every file about to be touched into a backup folder before it writes anything, so a bad edit is always one click away from being undone.
The Diff preview tab lists every attribute that's about to change, file by file — old value, new value, and which block and handle it belongs to. Nothing is written to a drawing until you confirm this list looks right.
4. Write back and verify
Click Write Selected Files. BlockSync writes the changes, then reads every changed attribute straight back out of the drawing to confirm it actually took — the results screen reports success/fail per file, plus where the pre-write backup was saved.
If anything looks wrong afterward, Rollback All on this same screen restores every file in the run from its backup in one click.
The same export → edit → preview → write-back flow works for any attribute on any block, not just title blocks — tag numbers, part numbers, revision clouds' companion attributes, whatever's baked into a block instance across a set of drawings.
For a full walkthrough of every screen and setting, see the BlockSync docs. To try it on your own drawings, download BlockSync — the Free tier covers up to 3 drawings per batch.