Convert text to and from Base64 or URL-safe format instantly — private by design, since nothing is ever uploaded.
EkZapp's free Base64 & URL Encoder/Decoder converts text between plain form and Base64 or URL-encoded format instantly as you type — no signup, and nothing you enter ever leaves your browser. Choose the Base64 or URL tab, pick Encode or Decode, and start typing; the output updates live with every keystroke.
A common situation this solves: an API returns a Base64-encoded string, a JWT token, or an image data URI, and you need to see what it actually contains. Rather than writing a script or opening a code console, you paste it here, switch to Decode mode, and read the plain result instantly — or go the other direction, encoding a string before embedding it in a config file or URL parameter.
Everything runs client-side using your browser's built-in btoa/atob and encodeURIComponent/decodeURIComponent functions. Nothing you type is uploaded to a server — conversion happens the instant you stop typing, with no delay and no risk of sensitive strings being logged anywhere.
The Swap Result to Input button is built specifically for verification — after encoding something, click it to instantly move the result back into the input box with the mode flipped to Decode, confirming the round trip gives back exactly what you started with.
The output updates as you type — no button required for the conversion itself, though one's there if you prefer it.
Encoding and decoding both run using your browser's own JavaScript engine — no network request is made at all.
Swap Result to Input flips the mode and reloads the output, so you can instantly verify a decode matches the original.
Decode a Base64 payload, JWT segment, or auth token to inspect its actual content while debugging.
URL-encode query parameters containing spaces or special characters before building a link.
Convert a small image or icon into a Base64 data URI to embed directly in CSS or HTML without a separate file request.
Inspect Base64-encoded attachment content that some email protocols use to transmit binary data as text.
Encode a secret or config value into Base64 before storing it in an environment variable or CI/CD pipeline.
Quickly decode an encoded string found in logs or network requests to understand what data is actually being sent.
Experiment with encoding and decoding to understand the difference between Base64 and URL encoding hands-on.
URL-encode text containing symbols or non-English characters before appending it as a query parameter in a shared link.
| Task | EkZapp Encoder/Decoder | Browser dev console |
|---|---|---|
| Setup required | ✓ None | Open dev tools, type a command |
| Handles Unicode/emoji safely | ✓ Built in | Requires extra encodeURIComponent wrapping |
| Round-trip verification | ✓ One click (Swap) | Manual, type it again |
| Works on mobile | ✓ Yes | Dev console rarely available |
| Cost | ✓ Free | Free, but requires dev familiarity |
Pick the tab depending on what you want to convert — Base64 for binary/text encoding, URL for query-string-safe text.
Choose whether you're converting plain text into the encoded format, or an encoded string back to plain text.
The Output box updates automatically as you type — no need to click Convert unless you prefer to trigger it manually.
Click Copy Output to copy the result, or Swap Result to Input to instantly check that decoding gives back your original text.
Re-encodes the entire input into a set of 64 safe ASCII characters (A-Z, a-z, 0-9, +, /) — commonly used for embedding binary data like images or files as text.
Leaves most characters unchanged and replaces only unsafe ones (spaces, &, ?, #, etc.) with a percent sign followed by a hex code — used for safely including text in a URL.
Use URL encoding for anything going into a link or query parameter; use Base64 for binary data, tokens, or when a system specifically expects Base64 input.
It's a common misconception that Base64 hides or protects data — it doesn't. Base64 is a reversible, publicly documented encoding scheme with no key or password involved; anyone who copies a Base64 string can decode it back to the original text in seconds using any of thousands of free tools, including this one. If you've ever seen a password or API key "obfuscated" as a Base64 string in a config file, that's worth flagging — it provides no real protection at all.
The actual purpose of Base64 is representation, not protection: it exists to safely carry binary data (like an image file or a cryptographic signature) through systems that only handle plain text, such as email, JSON, or XML. It solves a compatibility problem, not a security problem — the data is exactly as visible after encoding as before, just represented using a different, text-safe character set.
For anything that actually needs to stay confidential — passwords, API secrets, personal data — proper encryption (with a real key that only authorized parties hold) is the correct tool, not Base64 or URL encoding. This tool is well suited for its intended purpose of format conversion and inspection, but it should never be treated as a way to secure sensitive information.
The Base64 & URL Encoder is one of more than fifty free tools on EkZapp, sitting alongside a JSON Formatter, Color Picker, and other developer utilities. Because encoding and decoding run entirely as JavaScript in your browser using built-in functions, there's no server processing cost involved — the page loads once, and every conversion afterward is essentially free to run, which is exactly why the tool carries no usage limit or paywall.
This kind of utility tends to get opened for a quick check in the middle of debugging something else — a token decoded, a string encoded, then straight back to the actual code. That's part of why the page stays a single screen with no extra steps: pick a tab and mode, type or paste, and read the result.
It also means there's very little that can go wrong. There's no account to lose access to, no history of past conversions saved anywhere, and no settings menu to configure before the tool does what you need. Every visit starts from the same default state, which keeps the tool predictable whether you use it once a year or several times a day.