Base64 Encoder and Decoder input is rejected
The source data may be incomplete, malformed, or different from the format this tool expects.
Check the input hint, try a small sample first, and correct the source file before running the full job.
Use this tool
Prepare the input and run the tool
Paste the text or structured data for this tool, Set options. Result: Copy result, Review issue report.
Ready. Paste text and click Run.
Encoded or decoded output appears here.
Data handling: Files and pasted data are processed in this browser session.
Tool guide
How to use Base64 Encoder and Decoder
Use Base64 Encoder and Decoder when you need to check, convert, or prepare a file before using it in another app. Review the result before downloading or copying it.
What this tool does
Convert text to Base64 or decode Base64 back to text directly in your browser.
- Input
- Paste the text or structured data for this tool, Set options
- Output
- Copy result, Review issue report
Tool advantages
- Runs in this page; the file or pasted data is not sent to a new app.
- Keeps the preview, report, and download in the same screen.
- Gives you a report you can use as a cleanup list.
Step-by-step usage guide
- 1Add your data and confirm the options.
- 2Run Base64 Encoder and Decoder.
- 3Review the report and copy or download the result.
Common errors and fixes
Base64 Encoder and Decoder result looks incomplete
The preview can only use the rows, files, or fields provided in the current browser session.
Confirm that the full source was pasted or selected, then rerun the tool and review the output before downloading.
Base64 Encoder and Decoder output needs extra cleanup
Some destination systems have rules that are stricter than a browser-local utility can infer.
Use the report as a cleanup checklist and verify the final file in the app where it will be imported or shared.
When to use Base64 Encoder and Decoder
- You are checking files before an upload, import, share, or delivery.
- You want to confirm the result before sending it to another system.
- You need a copied result, downloaded file, or report that can be reviewed outside the page.
FAQ
Is my input uploaded to a server?
No. Encoding and decoding happens in your browser and nothing is sent to any server.
Why does decoding show an error?
Some Base64 text is invalid, so the tool shows a friendly error and you can fix the input before retrying.