What this tool does
Base64 shows up everywhere in developer work: auth flows, inline assets, email templates, config secrets and transport payloads. This page helps you encode and decode locally so you can inspect the data without relying on third-party sites.
- Encodes text or file content into Base64 for transport or embedding workflows.
- Decodes Base64 and Base64URL safely in the browser so developers can inspect what is really inside an encoded value.
- Supports practical debugging scenarios like JWT segments, Kubernetes secrets and data URIs.
How to use it
- 1
Choose Encode when starting from plain text or file content, or Decode when starting from an encoded value.
- 2
Paste the value or upload a compatible file.
- 3
Enable Base64URL mode if the string comes from JWTs or URL-safe contexts.
- 4
Copy or download the result once the output matches your workflow.
Example
A developer decodes a Base64URL fragment from a JWT-related workflow to inspect the underlying payload safely.
eyJzdWIiOiIxMjMiLCJyb2xlIjoiYWRtaW4ifQ{"sub":"123","role":"admin"}Use cases
- Inspecting Base64 values stored in config files, environment variables or secret management workflows.
- Preparing inline assets or text snippets for HTML, JSON or email template payloads.
- Debugging Base64URL-encoded content used in JWTs and URL-safe integrations.
Common mistakes
Treating Base64 as encryption
Base64 is only an encoding format. Anyone who decodes it can read the original data.
Using the wrong variant
Standard Base64 and Base64URL are close but not identical. A JWT-related string often needs URL-safe decoding.
Ignoring file size impact
Base64 increases the size of the original content, so it is useful for portability but not for compression.
FAQ
Does this tool upload my data?
No. Encoding and decoding happen locally in the browser.
What is the difference between Base64 and Base64URL?
Base64URL is a URL-safe variant that replaces characters like plus and slash so the value can travel safely in tokens and URLs.
Can I use this for JWT debugging?
Yes. It is useful for inspecting JWT-related Base64URL fragments, especially when you want more control than a one-click decoder.
Does Base64 protect sensitive data?
No. If the source is sensitive, treat the encoded string as sensitive too.
When should I use file upload instead of plain text?
Use file upload when you need to convert binary or structured content directly without copy-paste friction.
Privacy and security
- Encoding and decoding run locally in your browser.
- No Base64 value is sent to a remote API for conversion.
- That makes the route safer for internal payloads, tokens and embedded assets.
Related tools
Related tools for the next step in the same workflow:
Next step
Convert the value locally, then move to JWT, URL or data-format tools if the workflow continues.