How to open a JSON file online
Three steps, a few seconds, no software.
Open your .ADR file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .ADR 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 .ADR file?
The most common data format on the web.
An ADR file is a bookmarks export from old Opera browser (version 12 or earlier, Presto engine). Modern Opera (version 15+) cannot open it. To access your bookmarks, install Opera 12.18, import the ADR file, export as HTML, then import that HTML into any current browser.
Programs that open .ADR files
| Full name | Opera Bookmarks File |
|---|---|
| Developer | Opera Software ASA |
| First released | 1996 (Opera 2.x, Presto engine era) |
| Category | Text & Code |
| MIME type | text/plain |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .ADR file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .ADR 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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