How to open a JSON file online
Three steps, a few seconds, no software.
Open your .THMX file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .THMX 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 .THMX file?
The most common data format on the web.
A THMX file is a Microsoft Office theme, a reusable package of colors, fonts, and visual effects shared by Word, Excel, and PowerPoint. You apply it from the Design tab (or Page Layout in Excel), not open it like a document. Any version of Microsoft Office or Microsoft 365 on Windows or macOS can apply one.
Programs that open .THMX files
| Full name | Microsoft Office Theme |
|---|---|
| Developer | Microsoft |
| First released | 2007 (Office 2007 'Fluent' UI and OOXML) |
| Category | Text & Code |
| MIME type | application/vnd.ms-officetheme |
| Signature | 50 4B 03 04 "PK" - standard ZIP local file header |
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Every viewer is free to use.
Frequently asked questions
Is my .THMX file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .THMX 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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