Base64 Encode / Decode
Encode and decode Base64 strings instantly.
Base64 encoding represents binary data as ASCII text, which makes it safe to embed in JSON, URLs, email, and configuration files. Utilitoo's Base64 Encode/Decode tool converts plain text to Base64 and back again in either direction with a single paste and click.
Developers use Base64 when working with JWT segments, data URIs for inline images, Basic Auth headers, and serialized blobs in APIs. It is also handy when you need to move small binary snippets through systems that only accept text. Email systems and legacy integrations still rely on Base64 for attachments and encoded payloads.
Paste your input, choose encode or decode, and copy the result. If decoding fails, check for missing padding characters or URL-safe variant differences. Pair this tool with our JWT Decoder when inspecting token payloads, or with the URL Encoder when embedding encoded values in query strings.
Utilitoo runs entirely in your browser. Your strings, tokens, and credentials are never uploaded or logged. Free, fast, and privacy-first for engineers, security reviewers, and anyone handling encoded data in modern web applications. Because Utilitoo is browser-based, you can encode or decode sensitive development strings on locked-down machines where installing extra CLI utilities is not permitted. Utilitoo fits naturally into quick debugging sessions where you already have the browser open.
Reach for Base64 Encode / Decode when formats disagree between services, docs, and tickets. Encode and decode Base64 strings instantly. Prefer lossless round-trips for configs you will commit back to a repository.
Common use cases
- Encode and decode Base64 strings instantly - especially when the source arrives as a single unreadable line.
- Validating base64 encode decode shapes from webhooks, feature flags, or infrastructure manifests.
- Cleaning base64 encode decode snippets before they land in README files or internal wikis.
- Cross-checking CI failure logs that include base64 encode decode fragments.
- Using Base64 Encode / Decode as a quick second opinion next to a local CLI when results look suspicious.
Tips & common mistakes
Base64 Encode / Decode avoids context-switching to a desktop utility for one-off base64 encode decode work. Keep secrets out of shared screen recordings even though processing is local. Cross-check surprising results with a CLI once, then trust the browser tool for repeated edits.
Common errors
- Invalid padding - Base64 strings need correct = padding; mid-string whitespace can break decoding.
- Wrong alphabet - URL-safe Base64 differs from standard; select the matching mode.
How to use
- Enter text or Base64 string.
- Choose Encode or Decode.
- Copy the result.
Frequently Asked Questions
How do I encode text to Base64 online?▼
Paste your plain text into Utilitoo, select Encode, and copy the Base64 output. Processing happens instantly in your browser.
How do I decode a Base64 string back to text?▼
Paste the Base64 string, select Decode, and view the original text. Invalid padding or characters will show a clear error.
What is Base64 used for in web development?▼
Common uses include JWT payloads, data URIs, embedding small files in JSON, and Basic Authentication headers.
Can I decode Base64 that contains UTF-8 characters?▼
Yes. Utilitoo handles UTF-8 text correctly when encoding and decoding standard Base64 strings.
Is it safe to decode Base64 tokens with this tool?▼
Yes on Utilitoo. All encoding and decoding is local to your browser. Nothing is sent to our servers.
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