How to open a JSON file online
Three steps, a few seconds, no software.
Open your .CTB file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .CTB file opens as a tidy, foldable tree, with the exact line of any error pointed out.
Search, copy or download
Search keys and values, copy any path or value, switch to a table, or download a clean copy.
What is a .CTB file?
The most common data format on the web.
A CTB file is an AutoCAD color-dependent plot style table. It tells AutoCAD how each drawing color should print: its output color, line weight, and screening. You open and edit it inside AutoCAD with STYLESMANAGER or the Plot dialog. If AutoCAD reports the file is missing, copy the CTB into your Plot Styles support folder.
Programs that open .CTB files
| Full name | AutoCAD Color-Dependent Plot Style Table |
|---|---|
| Developer | Autodesk, Inc. |
| First released | 2000 (AutoCAD 2000 — replaced legacy .pcp/.pc2 pen assignments) |
| Category | Text & Code |
| MIME type | application/octet-stream |
| Signature | 50 49 41 46 56 30 "PIAFV0" - AutoCAD plot-style table header (compressed/encoded body follows) |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .CTB file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .CTB file is invalid. Can you fix it?
We show the exact line and column of the first error. For common problems like comments, trailing commas, single quotes or Python-style True/False/None, click Try to repair and download the fixed file.
How large can the file be?
Up to 50 MB. The tree only builds the branches you open, so even multi-megabyte files stay responsive.
What is JSONPath?
A path like $.orders[3].customer.email that points to one value inside the data. Click any node to see its path and copy it for code, jq or your API docs.
Can I see my data as a table?
Yes. Any array of objects can be shown in the Table view and downloaded as CSV.
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