Guide
Base64 Encoder — complete guide
What is Base64 encoding?
Base64 converts binary or text data into a safe ASCII string using 64 characters (A–Z, a–z, 0–9, +, /) plus padding (=). It is not encryption — anyone can decode it. It exists so binary data can travel through systems that expect text: email, JSON fields, data URIs, and some HTTP headers.
The Base64 Encoder on space4.dev encodes text in your browser. Use it when you need a quick Base64 string for prototypes, JWT fragments, or embedding small payloads.
How to encode text to Base64
Steps:
- Paste the plain text you want to encode.
- Click Encode (or allow live conversion) to produce a Base64 string.
- Copy the output into your API client, config, or email template.
- Remember: Base64 increases size by roughly 33% compared with the original bytes.
Base64 vs Base64URL
Standard Base64 can include + and / which are awkward in URLs. Base64URL replaces those characters and often omits padding. If you are building JWTs or putting tokens in query strings, prefer the Base64 URL Encoder on space4.dev instead of classic Base64.
Encode without uploading secrets
Encoding happens locally. That matters when the input is an API key, a password for a temporary test, or a customer identifier — you still should not treat Base64 as secure storage, but at least the string is not sent to our servers.