Developer tools
Base64 Decode Online
Decode Base64 text to readable Unicode text locally in your browser.
Privacy note
Your text is processed in your browser. This tool does not store pasted text on a server.
When this tool helps
Use this tool to decode Base64 text locally in your browser.
It is useful for inspecting encoded examples, debugging API payloads, and checking text-only Base64 snippets.
Common cleanup options
Readable decoded text
Decode UTF-8 Base64 strings into readable text for quick inspection.
URL-safe Base64
The decoder accepts the - and _ URL-safe alphabet and can handle missing padding for common pasted snippets.
Invalid input handling
Invalid Base64 input returns a readable message so you can fix the source text.
Browser processing
Pasted input is processed in the browser and is not uploaded by this tool.
How to use it
- Paste standard or URL-safe Base64 text.
- Keep trim enabled if copied whitespace is accidental.
- Run the tool to decode it as UTF-8 text.
- Copy the readable result for debugging or cleanup after reviewing it.
Privacy, review, and limitations
The current version processes pasted text in your browser for normal use, and the page explains the tool behavior that is visible in the interface. Review the preview before copying output into another workflow, especially when the source text came from PDFs, spreadsheets, exports, or copied tables.
Base64 may contain sensitive data after decoding, so review output before sharing it.
The decoder treats output as UTF-8 text. Binary data may appear as unreadable replacement characters.
This text-focused version is not designed for large binary files.
Frequently asked questions
Can this decode Unicode text?
Yes. The tool decodes Base64 bytes as UTF-8 text.
Can it decode URL-safe Base64?
Yes. It accepts URL-safe Base64 that uses - and _ characters, and it can restore missing padding when the input length allows it.
What happens with invalid Base64?
The tool returns a readable error message instead of crashing.
Is my Base64 text uploaded?
No. The current tool runs locally in your browser.
Last updated: May 11, 2026
See the tool in action
How this page is maintained
This tool page is maintained for practical accuracy, clear limitations, browser-based processing behavior, and links to related cleanup tasks. It is intended for everyday text cleanup, not for legal, medical, financial, security, or other high-stakes decisions.
Browser-local processing
The current tool runs in the browser and does not require an account, upload, or server-side text processing for normal use.
Reviewed behavior
Examples, options, and limitations are checked against the actual tool behavior before public pages are added to the site.
Human review still matters
Text cleanup can miss source-specific issues such as broken words, malformed data, or copied table artifacts, so review important output before reuse.
Safe use checklist
- Use sample or non-sensitive text when testing a workflow.
- Check the output preview before copying it into another system.
- Keep confidential, regulated, or customer data inside approved tools.
- Use related tools only when they match the same cleanup task, not to force unrelated edits.