Encode and decode Base64 strings, text, images, and files instantly
Select whether you want to encode (convert to Base64) or decode (convert from Base64) your data.
Paste or type the text, image data, or file content you want to encode or decode into the input field.
Click the encode or decode button. The tool will instantly convert your data and display the result.
Click the copy button to copy the encoded or decoded result to your clipboard for use elsewhere.
If encoding a file, you can download the Base64-encoded result as a text file.
For decoding, verify that the output matches your expectations. Invalid Base64 strings will show an error.
Use the Base64-encoded string in data URIs, API requests, email attachments, or anywhere Base64 encoding is required.
Remember that all processing happens in your browser. Your data is never sent to our servers.
Base64 is commonly used to encode binary data (like images or files) into text format for transmission over email, HTTP, or storing in JSON/XML. It's also used in data URIs for embedding images in HTML/CSS.
No, Base64 is encoding, not encryption. It's easily reversible and provides no security. Anyone can decode Base64 data. Use proper encryption if you need to protect sensitive information.
Yes, you can encode images by uploading an image file or pasting image data. The tool will convert the image to Base64 format, which can be used in data URIs or API requests.
Base64 encoding increases data size by approximately 33%. This is because every 3 bytes of binary data become 4 ASCII characters.
Yes, paste a Base64-encoded image string and click decode. The tool will convert it back to binary format, which you can then download or view.
Yes, all encoding and decoding happens entirely in your browser using JavaScript. Your data never leaves your device or is sent to any server.
Base64 uses 64 characters: A-Z, a-z, 0-9, plus (+), and slash (/). The equals sign (=) is used for padding at the end.
Yes, you can upload files or paste file content to encode them. The tool supports text files, images, PDFs, and other file types.
Base64 is used when you need to transmit binary data through text-only channels (like email or JSON), or when embedding data directly in HTML/CSS/JavaScript.
The tool can handle large files, but very large files may slow down your browser. For files over 10MB, consider using a desktop application instead.
Base64 encoding increases data size by approximately 33%. A 1MB file becomes ~1.33MB when encoded. Factor this overhead into bandwidth and storage decisions.
Base64 is ideal for embedding small images (under 10KB) or fonts directly in CSS/HTML. For larger files, serve them as separate files to leverage browser caching.
Base64 encoding is easily reversible and provides zero security. Never use it to hide sensitive data like passwords, API keys, or personal information.
Small SVG icons and tiny images can be Base64-encoded as data URIs to eliminate HTTP requests. This reduces latency for critical above-the-fold assets.
Standard Base64 uses + and / which break URLs. Use URL-safe Base64 (replacing + with - and / with _) when encoding data for query parameters or URL paths.
Always validate that input is valid Base64 before decoding. Invalid characters or incorrect padding can produce corrupted output or security vulnerabilities.
Base64 padding uses trailing equals signs (= or ==) to make the length a multiple of 4. Some implementations strip padding. If you encounter decode errors, try adding or removing padding characters.
When embedding Base64 images in HTML or CSS as data URIs, use the correct MIME type prefix: data:image/png;base64, or data:image/jpeg;base64,. An incorrect prefix will cause the browser to reject the image.
Binary files (images, PDFs, executables) can be encoded and embedded in JSON or XML payloads using Base64. This is common in REST APIs that need to transfer file content without multipart form uploads.
Different programming languages and systems may produce slightly different Base64 output due to line wrapping (every 76 characters in MIME) or no wrapping. If decoding fails, try stripping all whitespace and newlines from the encoded string first.
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