How do I decode a Base64 string online?

Paste your Base64 string into SmartDevBox at smartdevbox.com. It automatically detects Base64 encoding and decodes it instantly — no configuration needed.

How do I decode a JWT token without a secret?

Paste your JWT token into SmartDevBox. The JWT Inspector tool decodes the header and payload and displays them as readable JSON. Note: this decodes but does not verify the signature — you don't need the secret to read the claims.

How do I format or pretty-print JSON?

Paste your minified or unformatted JSON into SmartDevBox. The JSON Formatter tool detects it automatically and pretty-prints it with configurable indentation.

How do I convert a Unix timestamp to a human-readable date?

Paste a Unix timestamp (e.g. 1700000000) into SmartDevBox. The Unix Timestamp converter detects it and shows the equivalent date and time in UTC and your local timezone.

How do I convert JSON to CSV?

Paste a JSON array of objects into SmartDevBox and select the JSON → CSV tool. It converts your data to comma-separated format with headers derived from the JSON keys.

How do I compute a SHA-256 hash online?

Use the Hash Generator tool on SmartDevBox. Paste any text and it computes MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously in the browser.

How do I parse and understand a cron expression?

Paste your cron expression (e.g. "0 9 * * 1-5") into SmartDevBox. The Cron Job Parser explains it in plain English and shows the next scheduled run times.

How do I decode an X.509 certificate online?

Paste a PEM-encoded certificate (beginning with -----BEGIN CERTIFICATE-----) into SmartDevBox. The Certificate Decoder extracts and displays the subject, issuer, validity dates, public key, and extensions.

Is SmartDevBox free to use?

Yes. SmartDevBox is completely free with no account or sign-up required. All tools run in the browser. An optional AI mode (for ambiguous input detection) can be enabled with your own OpenAI API key.

Does SmartDevBox send my data to a server?

No. All tools run entirely in the browser using client-side JavaScript. Your data never leaves your machine unless you opt into the AI mode, which sends input to OpenAI for format detection.

Base64 Encoder — Encode Text to Base64 Online

Base64 Encoder converts any plain text string into its Base64 representation in your browser. Paste your text and the encoded result appears immediately — no button to click. Standard RFC 4648 Base64 encoding is used, with = padding applied automatically. All encoding runs client-side; your data never leaves your machine.

Common Use Cases

Encoding credentials for HTTP Basic Authentication headers
Embedding binary data inside JSON or XML payloads
Creating Base64 data URIs for inline images in HTML or CSS
Encoding configuration secrets for environment variables
Preparing binary payloads for text-only transmission protocols

Frequently Asked Questions

How do I encode text to Base64?

Paste your text into SmartDevBox. The Base64 Encoder converts it instantly. You can also type directly into the input field and the encoded output updates in real time.

Does Base64 encoding encrypt my data?

No. Base64 is an encoding scheme, not encryption. It is trivially reversible by anyone. Do not use Base64 to protect sensitive data — use proper encryption for that.

Why does Base64 output always end with = or ==?

Base64 encodes 3 bytes at a time into 4 characters. If the input length is not divisible by 3, padding characters (=) are added to make the output length a multiple of 4.

Privacy & Security

This tool runs entirely in your browser using client-side JavaScript. No data is sent to a server — your input never leaves your machine. SmartDevBox has no account system, no usage tracking, and no paid tier. See the Privacy & Security page for full details.

Base64 DecoderDecode any Base64 string back to plain text instantly in your browser. Free, no sign-up, 100% client-side. Supports standard and URL-safe Base64.
Base64 Image DecoderDecode a Base64 image data URI and view MIME type, byte size, and HTML/CSS usage examples. Free, no sign-up.
URL EncoderPercent-encode any string for safe use in URLs instantly in your browser. Free, no sign-up, 100% client-side.
HTML EncoderConvert special characters like < > & " to HTML entities instantly in your browser. Free, no sign-up, 100% client-side.