Encode and Decode Base64 Online
Convert text, files and URL-safe Base64 without confusion
Drop any file to get its Base64 data URI
Everything stays in your browser
Use this Base64 Encoder and Decoder to convert text, files and data strings between plain content and Base64 format. It helps developers, QA engineers, API testers, students and technical teams work with encoded data used in JSON payloads, data URIs, JWT segments, email formats, web assets and debugging workflows. Base64 is useful when binary data needs to travel through text-only systems, but it is not encryption and it does not reduce file size. This tool helps you encode, decode and inspect Base64 output more clearly before using it in code, APIs or documentation.
How to Encode or Decode Base64
Type text or drop a file — encode or decode in one click with URL-safe support.
Encode or decode text
Select the Encode or Decode tab. In Encode mode, type or paste your text and click Encode — the Base64 output appears in the right panel. In Decode mode, paste a Base64 string and click Decode to get the original text back. The tool handles Unicode characters correctly using UTF-8 encoding before applying Base64.
Encode a file to a data URI
Drag and drop any file onto the drop zone, or click it to open a file picker. The file is read locally by your browser and converted to a Base64 data URI in the format data:type/subtype;base64,... — for example, data:image/png;base64,iVBOR... for a PNG image. You can embed this data URI directly in an HTML img src attribute or a CSS background-image property.
Toggle URL-safe mode
Enable URL-safe mode to replace + with - and / with _ in the output. URL-safe Base64 is required for JWT tokens, URL query parameters, and any context where + and / have special meaning. The padding = characters are typically omitted in URL-safe contexts — toggle the Strip padding option if your target system requires it.
Features
Encodes plain text into Base64 for APIs, data fields and testing
Decodes Base64 strings back into readable text when possible
Converts selected files into Base64 data URI-style output
Supports URL-safe Base64 used in JWTs and URL contexts
Handles UTF-8 text so Unicode characters remain more predictable
Highlights that Base64 is encoding, not encryption or compression
Helps inspect encoded strings copied from headers, payloads or logs
Supports practical debugging for JSON, JWT, email and web asset workflows
Copies encoded or decoded output for code, docs and API clients
Reduces manual mistakes caused by padding, symbols and text encoding
What This Tool Helps You Do
Encode text or files into Base64, or decode Base64 back into readable text when the encoded content represents text. Base64 is common in APIs, tokens, email formats, data URIs and web debugging because it lets binary-like data move through text-only systems.
The important point: Base64 makes data portable, not private. A Base64 string can be decoded by anyone.
When Base64 Is Useful
Use Base64 when you need to embed a small image in HTML or CSS, send binary data inside JSON, inspect encoded token segments, test API payloads or decode a value copied from logs. If the encoded data belongs to a JWT, decode the token structure with a JWT Decoder instead of treating the whole token like normal text.
For files and downloads, use a Hash Generator when your goal is verification, because hashing and Base64 solve different problems.
Practical Checks Before Using Output
Check whether your target system expects standard Base64 or URL-safe Base64. Standard Base64 uses characters like + and /, while URL-safe Base64 replaces them for safer use in links and token segments. Also check padding: some systems require equals signs at the end, while others remove them.
If the decoded result looks unreadable, it may be binary data, a partial string, compressed content or text encoded with a different character set.
Expert Tips
Use Base64 data URIs only for small assets. They can be convenient, but they increase size and cannot be cached like normal files. For structured payloads, format surrounding data with a JSON Formatter before copying encoded values into API examples.
Do not store passwords, secrets or private keys in Base64 and assume they are protected. Use real encryption or secure storage when confidentiality matters.
Common Mistakes to Avoid
- Confusing encoding with encryption
- Embedding large images as Base64 and slowing down pages
- Copying Base64 strings with missing characters or extra line breaks
- Using standard Base64 where URL-safe Base64 is required
- Removing padding when the receiving system expects it
- Trying to read binary decoded output as plain text
- Hashing data and Base64-encoding data as if they were the same task
- Sharing sensitive tokens after decoding only part of the value
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Frequently Asked Questions
What is Base64 encoding used for?
Base64 converts binary or text data into printable characters that can travel through text-based systems. It is commonly used in JSON payloads, data URIs, email formats, JWT segments and API debugging.
How do I encode text to Base64?
Paste the text into the encoder and copy the generated Base64 output. If the text includes Unicode characters, make sure your target system expects UTF-8 encoded Base64.
Can I decode any Base64 string?
You can decode valid Base64 strings, but the result may not always be readable text. Some Base64 strings represent images, files, binary data or compressed content.
Does Base64 encrypt my data?
No. Base64 is encoding, not encryption. Anyone can decode a Base64 string, so never treat it as a way to hide secrets or protect sensitive data.
Is Base64 smaller than the original file?
No. Base64 usually makes data about one-third larger because it represents binary bytes as text characters. Use compression separately if size reduction is the goal.
Why does my decoded text look broken?
The Base64 string may contain binary data, may be incomplete, or may use a different character encoding. Hidden line breaks, missing padding or copied partial strings can also corrupt output.
When should I use URL-safe Base64?
Use URL-safe Base64 when the encoded value must appear in URLs, tokens or query parameters. It replaces characters such as + and / with safer alternatives.
Can I convert an image to Base64?
Yes. You can encode an image file into a Base64 data URI for small web assets or testing. For large images, a normal file URL is usually better for caching and performance.
What is Base64 padding?
Padding uses equals signs at the end of some Base64 strings to complete the encoded length. Some systems require padding, while URL-safe formats such as JWTs often omit it.
What should I check before using Base64 in production?
Check whether your system expects standard or URL-safe Base64, whether padding is required, and whether the decoded content is text or binary. Avoid embedding large Base64 assets directly in pages.
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