SEO Report Tools

Webmaster Utilities · Runs in your browser · Free

Base64 Encoder / Decoder

Encode text to Base64 (UTF-8 safe) or decode Base64 back to text.

What this tool does

Converts text to Base64 and back, handling Unicode correctly, with an optional URL-safe variant used in tokens and data URLs.

Who should use it

Developers inspecting tokens, data URIs and encoded configuration.

How it works

Text is encoded to UTF-8 bytes, then to Base64. The URL-safe option swaps + and / for - and _ and drops padding. Decoding validates the bytes as UTF-8 and reports an error otherwise.

How to use it

  1. Enter or paste text in the form.
  2. Adjust the options below the main box if you need to; the defaults suit most cases. Use "Load example" to see how input should look.
  3. Press the run button. Processing happens instantly in your browser.
  4. Review the result panel, then copy or download the output if the tool offers it. Use Reset to start over.

Practical example

"hello" encodes to "aGVsbG8=".

Understanding the results

Base64 is an encoding, not encryption; anyone can decode it.

Limitations

Binary data (images, files) is not handled; only text.

Accuracy and report transparency

Results are computed in your browser from exactly what you enter. Deterministic steps (counting, parsing, encoding, validation) are verified by an automated test-suite with known answers. Where a method is a heuristic, the result panel says "estimated". No external data is used and nothing is invented.

Privacy

Your input never leaves your device for this tool. We count anonymous events (tool opened, run, copied) without storing what you typed. See the Privacy Policy.

Try these next

URL Encoder / DecoderPercent-encode or decode text for use in URLs and query strings.MD5 & SHA Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text in your browser.HTML Entity Encoder / DecoderEscape or unescape HTML special characters and numeric entities.

Frequently asked questions

Is Base64 secure?

No. It only changes representation. Never use it to hide secrets.

Is my data sent to your server?

No. This tool runs entirely in your browser, so the text or files you enter stay on your device. We do record anonymous counts of how often each tool is opened or run (no input data) to see which tools are useful.

How accurate are the results?

Counting, parsing, encoding and validation steps are deterministic and covered by automated tests with known answers. Anything based on a heuristic is labelled "estimated" in the result panel.

Is this tool really free?

Yes. There is no account, limit or paid plan. The site is supported by advertising, which is disclosed on our Advertising Disclosure page.

References