Base64 result will appear here...
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Why Use Base64Tool?
Lightning Fast
Type or paste text; encode/decode updates with the browser's Base64 helpers. Useful for quick data-URI and API payload checks.
No upload form
Conversion happens in this tab. We do not store pastes in an account or send them to a processing API.
Simple & Clean
Swap encode/decode, copy the output in one click, and stay on a single short form—no extra panels.
Key Features
Text in, Base64 out (or the reverse)—with copy and mode swap for everyday debugging.
Encode & Decode
Two-way Base64 conversion —encode text or decode Base64 strings.
One-Click Copy
Copy the result to your clipboard with a single click.
Swap Mode
Switch between encode and decode instantly.
Responsive Design
Layout works on phone and desktop; very long strings may still stall a weak device.
Local Processing
All conversion happens in your browser —data never leaves.
How to Use This Base64 Encoder
Pick a mode, paste, copy the result.
Choose Mode
Encode plain text to Base64 or decode Base64 to text.
Paste or Type
Enter your text or Base64 string in the input area.
See Result
The converted output appears instantly.
Copy & Use
Click copy and paste wherever you need it.
About This Base64 Encoder
Base64Tool turns plain text into standard Base64 (and back) in the browser. People use it for data URIs, poking at JWT-ish payloads, or checking what an API labeled "base64" actually contains. Encoding grows size by about one third; that is normal, not a bug.
Limits matter: the classic btoa/atob path chokes on some Unicode unless the page first encodes bytes, URL-safe Base64 (-/_) is not the same alphabet as standard Base64, and multi-megabyte binary blobs belong in a local script—not a phone browser tab. Base64 is encoding, not encryption; anyone can decode it.
Frequently Asked Questions
What is Base64 good for here?
Quick text ↔ Base64 conversion for debugging, data URIs, and text-safe payloads. It is not a file host and not a crypto vault.
Is Base64 encryption?
No. Anyone with this page (or atob) can reverse it. Use real encryption when secrecy matters.
Why does decode fail?
Invalid characters, wrong padding, truncated strings, or URL-safe alphabet mixed into a standard Base64 field. Strip data-URI prefixes like data:...;base64, before decoding the payload alone.
Does this upload my text?
Conversion runs in the page. There is no server-side encode API for your paste. Extensions can still read the DOM—treat credentials accordingly.
When should I not use this page?
Skip it for huge binaries, bulk batch jobs, or pipelines that need URL-safe Base64 / Base64url specifically unless you convert alphabets yourself. Prefer local scripts for those cases.