Base64 encoder and decoder
Encode UTF-8 text as Base64 or decode valid Base64 back to text.
Text is processed only on this device. Standard limit: 5 MiB; JSON and Base64: 2 MiB.
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How to use
Paste the text you want to base64 encoder and decoder, choose any available options, then select Transform. The result remains in this browser tab.
Example
Encode mode preserves UTF-8 characters before producing Base64. Input: “Olá 👋”. Output: “T2zDoSDwn5GL”.
Uses
Use base64 encoder and decoder when the output needs one specific, repeatable text transformation rather than a manual edit.
Limitations
This tool follows the documented engine rules. Encode mode preserves UTF-8 characters before producing Base64. Review the result when language context, terminology, or formatting conventions matter.
Local privacy
Your input and result are processed locally on this device. Convertca does not put tool text in URLs, analytics, or saved histories.
Task-specific guidance
Use it to create or inspect Base64 payloads while keeping the text on your device.
FAQ
Does it send my text anywhere? No. Ordinary transformations run locally; use Copy or Download only when you choose to take the result elsewhere.
Verified examples
- Input
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Olá 👋
- Output
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T2zDoSDwn5GL