How to encode and decode Base64 online for free

Encoding to Base64 turns text (or bytes) into an ASCII-safe string. Decoding reverses that step. You can do both in code, in a CLI, or with a free online Base64 encoder that runs in your browser so private strings stay on your device.

Encode and decode with Jigglify (30 seconds)

1. Open the Base64 encoder.
2. Choose Encode or Decode.
3. Paste your text (or Base64) into the input panel, or click Sample.
4. Click the arrow to process.
5. Copy the output, or switch modes to round-trip and confirm the result.

Encode vs decode

Encode produces Base64 from UTF-8 text. Decode restores UTF-8 from Base64. Use Encode when embedding a value in a text-only channel; use Decode when inspecting a header, data URL payload, or opaque string that looks like Base64.

Why encode locally?

Online converters that upload your input can expose API keys, session material, or customer data. Jigglify runs btoa/atob-style Web APIs in the browser so the content never leaves your machine.

Tips for reliable Base64

• Strip accidental spaces and line breaks before decoding (this tool does that for you).
• Expect padding with = on standard Base64.
• Remember Base64 is larger, not smaller - it is not compression.
• Do not treat Base64 as a secret store - read Base64 vs encryption.

Encode or decode Base64 free - process locally with no account and no upload.
Open the free Base64 tool →

Related: What is Base64? · Base64 vs encryption