Base64 Decoder
The Base64 Decoder converts Base64 strings (standard and URL-safe, padding optional) back into UTF-8 text, locally and instantly.
- No length limits
- No registration
- Free forever
- Your text never leaves your browser
How to decode base64 strings into readable text
Choose the mode
Pick “decode Base64 strings into readable text” or the reverse mode from the options — both run in the same box.
Paste your input
The result appears immediately, before you even finish pasting.
Copy the result
One click puts the output on your clipboard.
Use it
debugging API responses, JWTs, email attachments and encoded config values
Why use this base64 decoder?
Typical uses: • Inspecting JWT payload claims without a server round-trip • Recovering text from encoded log lines • Decoding data URIs to check what an image really contains
Because the conversion is deterministic and local, results are identical every time and nothing leaks to third parties.
Both directions live on one page, so you never have to bookmark two tools for one job.
Base64 Decoder — details
| Directions | Decode Base64 strings into readable text and encode text into Base64 |
|---|---|
| Processing | 100% in your browser — offline after load |
| Length limit | None |
| Price | Free, no account needed |
| Notes | Accepts standard and URL-safe alphabets, with or without padding, and ignores stray whitespace. |
Your text never leaves your browser
Every tool runs locally on your device. Nothing you paste is uploaded, stored, or tracked.
Frequently asked questions
Can it encode text into base64 too?
Yes — switch the mode option and the same box converts in the other direction.
Is there a size limit?
No hard limit. Very long inputs simply take a few more milliseconds.
Does it work offline?
Yes. Once the page has loaded, the conversion runs without any connection.