How to open a JSON file online
Three steps, a few seconds, no software.
Open your .B64 file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .B64 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 .B64 file?
The most common data format on the web.
A .b64 file is a binary file (image, archive, document, or anything else) encoded as plain ASCII text using Base64. To get the original file back, decode it: on Windows run "certutil -decode input.b64 output.bin" in Command Prompt; on Linux or macOS run "base64 -d input.b64 > output.bin". WinZip and IZArc can also open .b64 files directly. The extension does not tell you what is inside.
Programs that open .B64 files
| Full name | Base64 MIME Encoded File |
|---|---|
| Developer | N/A (Base64 encoding per RFC 1421/2045; .b64 extension convention, no single author) |
| First released | MIME RFC 2045 (1996); Base64 as a concept dates to Privacy-Enhanced Mail (RFC 1421, 1993); .b64 extension informal convention |
| Category | Text & Code |
| MIME type | text/plain |
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Every viewer is free to use.
Frequently asked questions
Is my .B64 file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .B64 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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