Developer & Data

Encoder & Decoder Studio

Base64, URL, HTML, hex, binary, ROT13 and Morse in one place.

Encoder and decoder

Choose a scheme, paste your data, and convert in either direction.

Select a scheme and press Encode.

Batch mode

Applies the selected scheme to every line independently.

Pipeline

Chain transforms, applied top to bottom. Useful for unpicking nested encodings.

Available: base64-encode, base64-decode, base64url-encode, base64url-decode, url-encode, url-decode, html-encode, html-decode, hex-encode, hex-decode, rot13, reverse, upper, lower, trim, json-pretty, json-minify 
Pipeline output appears here.

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About Encoder & Decoder Studio

All-in-one offline encoder and decoder: Base64 and Base64URL, URL and component encoding, HTML entities, hexadecimal, binary, octal, ROT13, Caesar cipher, Morse code and file-to-Base64 data URIs.

What it does

How to use it

  1. Paste your text into the input box, or drop a file to turn it into a data URI.
  2. Pick an encoding scheme from the list on the left.
  3. Press Encode or Decode; the result appears instantly and can be copied or downloaded.
  4. Use Batch mode to process one line at a time, or Pipeline to chain several encodings together.

Encoder & Decoder Studio is one of 50 free tools from CRMTECH Solutions. See all Developer & Data tools or browse every tool.

Frequently asked questions

Is Base64 encryption?

No. Base64 is an encoding, not encryption. Anyone can decode it in a second. Use it to move binary data safely through text channels, never to hide a secret. For secrets use the Hash and Checksum Generator or proper encryption.

What is the difference between Base64 and Base64URL?

Base64URL replaces + with - and / with _ and usually drops the = padding, so the result is safe inside a URL or a filename. JWT tokens use Base64URL.

Does it handle non-English text correctly?

Yes. Text is converted to UTF-8 bytes before encoding, so Hindi, Marathi, emoji and any other Unicode round-trip exactly. The plain btoa function in a browser would fail on these.

How big a file can I convert to a data URI?

Files up to about 10 MB work well. Remember that Base64 makes data roughly 33% larger, so a 10 MB file becomes a 13.3 MB string, which is impractical to inline in a stylesheet.

What is the pipeline for?

It applies several transforms in order, for example URL-decode then Base64-decode then pretty-print JSON. It is useful for unpicking a value copied out of a log file or a network trace.

Is Encoder & Decoder Studio free?

Yes. Encoder & Decoder Studio is free for everyone and needs no sign-up to use. An account is only needed to export, download or print, because every export is recorded.

Are my files uploaded to a server?

No. Encoder & Decoder Studio works inside your web browser, so the files you open are processed on your own device. If you sign in, the work you save (such as drafts and registers) is also kept in your account so it follows you to other devices.

Does it work on a phone?

Yes. It works in current versions of Chrome, Edge, Safari and Firefox on phones, tablets and computers, with nothing to install.