Base64 Encoder & Decoder
Encode text to Base64 and decode it back with Unicode fidelity.
- Free
- No signup
- Runs in your browser — nothing is uploaded
Browser onlyYour data never leaves this device.
Runs entirely in your browser. Your text never leaves this device and is never stored.
Details: Privacy policy
Input
Unicode-safe. Nothing is stored.
Result
No input yet.
Enter text above to convert it.
Base64 Encoder & Decoder performs bidirectional text conversion between raw UTF-8 strings and standard Base64 representations, solving data transport encoding hurdles across APIs, authorization headers, and configuration payloads. Unlike URL Encoder, which percent-encodes reserved characters within query strings, Base64 converts arbitrary byte sequences into safe 6-bit ASCII radix-64 representations. The engine achieves full Unicode fidelity through standard TextEncoder and TextDecoder interfaces, processing byte arrays in 32,768-byte chunks (0x8000) to eliminate browser call-stack overflows and prevent character-replacement corruption on Arabic text, accented scripts, and emojis. Decoding enforces rigorous structural validation: non-whitespace characters must adhere strictly to the Base64 alphabet (A–Z, a–z, 0–9, plus, slash, and up to two equals padding signs) with compact lengths divisible by four. Any corrupted characters or malformed byte sequences trigger immediate, actionable validation errors rather than silently generating scrambled garbage text. Operating within a 200,000-character ceiling, the entire conversion cycle executes locally in client memory, ensuring secret authorization tokens and private communication payloads remain on your machine.
Key facts
- Input
- Text, Base64 string
- Output
- Base64 text, Decoded plain text
- Limits
- Input is bounded to 200,000 characters per conversion run to ensure responsive execution. Encodes UTF-8 byte sequences: text originating from different code pages produces divergent Base64 output.
- Processing
- In your browser — nothing is uploaded
- Sign-up
- Not required
- Cost
- Free
Limits above are read from the same code that enforces them; formats are the ones the tool accepts and produces.
How to use Base64 Encoder & Decoder
- Paste or type your input string into the text area (up to 200,000 characters).
- Select Encode to transform text to Base64, or Decode to convert Base64 back to plain text.
- Observe immediate conversion feedback powered by client-side UTF-8 stream processing.
- Check validation alerts for alphabet or padding discrepancies when decoding external tokens.
- Click Copy result or Download output to export your converted payload as a text file.
- Click Clear input to empty the work area and reset the tool.
What you get
- Encoded Base64 text, or the decoded plain text, shown immediately.
- Copy and download actions for the converted result.
- Strict decode validation: only A–Z, a–z, 0–9, plus, slash and equals padding are accepted.
- A 200,000-character input ceiling for each run.
When to use Base64 Encoder & Decoder
- Embed small UTF-8 payloads in ASCII-only transports.
- Inspect an opaque Base64 token by decoding it locally.
- Check whether a copied token is valid Base64 before pasting it into code.
Frequently asked questions about Base64 Encoder & Decoder
Does Base64 Encoder send my tokens or data across the network?
No. Encoding and decoding take place entirely inside your browser tab via TextEncoder and TextDecoder APIs; nothing is transmitted or stored.
What input character limits apply to Base64 conversion?
The tool processes input texts up to 200,000 characters in a single pass without memory degradation, validated prior to buffer allocation.
How does Base64 Encoder differ from URL Encoder?
URL Encoder replaces specific reserved characters with percent-encoded escape sequences for URI query strings, whereas Base64 transforms raw binary octets into 6-bit ASCII representations.
How are multi-byte Arabic letters and emojis preserved during conversion?
Text is converted into binary UTF-8 octets before applying Base64 algorithms, guaranteeing Arabic diacritics and complex emoji sequences round-trip without corruption.
Why does decoding fail on certain Base64 strings?
Decoding validates that the compacted string length is a multiple of 4 and contains only characters from the standard Base64 alphabet (A–Z, a–z, 0–9, +, /) with valid '=' padding.
Guides that compare Base64 Encoder & Decoder
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