About Base64 Encode / Decode
Encode or decode Base64 online without sending strings to a server. This Base64 encoder and decoder is built for developers who move data between APIs, JWTs, and data URLs. Processing is local, so secrets and tokens you paste for inspection stay on your device. Pair it with JWT and hash tools in the same workspace when you are debugging auth flows.
What stays local: Strings, tokens, and snippets you encode or decode.
What you can do with Base64 Encode / Decode
- Encode text to Base64
- Decode Base64 back to text
- Fast client-side conversion
- Private — no server round-trip
How to use Base64 Encode / Decode
- Choose encode or decode. Open the Base64 tool and pick the direction you need.
- Paste input. Paste plain text to encode, or a Base64 string to decode.
- Convert. Run the conversion and copy the result.
- Keep it private. Remember Base64 is encoding, not encryption — treat secrets carefully.
Examples
Encode
Input
hello
Output
aGVsbG8=
Privacy
What stays local: Strings, tokens, and snippets you encode or decode. DevTooKit is local-first — no signup wall, no server-side processing for this tool, and no watermark on results.
Related tools
FAQ — Base64 Encode / Decode
Privacy, offline use, and how this free online tool works.
Is Base64 the same as encryption?
No. Base64 is encoding for transport. Anyone can decode it — use real encryption for confidentiality.
Does decoding upload my string?
No. Encode and decode run in your browser only.
Can I use this Base64 tool offline?
Yes after installing DevTooKit as a PWA.
Is it free?
Yes — free online Base64 encode/decode with no account.