Base64 Encoder/Decoder
Encode and decode Base64 strings online. Support for files, URL-safe encoding. Free Base64 converter with file upload.
What is Base64 Encoding?
Base64 is a binary-to-text encoding that represents arbitrary bytes using 64 printable ASCII characters (A–Z, a–z, 0–9, plus
+ and /), expanding the data by roughly 33% in exchange for safe transit through text-only channels. It exists because email (MIME), HTTP Basic Auth, JSON, JWTs, data URIs, and many config formats can only carry text reliably — Base64 lets you embed images, binary blobs, and raw bytes inside those text containers without corruption. This encoder/decoder handles strings and files, supports the URL-safe variant (RFC 4648 §5), and runs 100% client-side. Note that Base64 is encoding, not encryption — never use it to protect secrets. For real confidentiality use the AES Encryptor; for one-way fingerprints use the Hash Generator.Text / File Input
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Click or drag a file here to encode it to Base64
Max file size: 5MB
Base64 Output
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Encoding Statistics
Input Size
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Output Size
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Size Ratio
N/A
Mode
Encoding
About Base64: Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. It is commonly used for encoding data in URLs, email attachments, and data URIs. Base64 encoding increases data size by approximately 33%.
How to use this tool
- 1Pick encode or decode and an input sourceChoose Encode or Decode. Paste text into the input area or drag-and-drop a file — FileReader reads it locally without any upload.
- 2Toggle URL-safe if neededEnable URL-safe encoding when the output goes into a URL, JWT, or file name where + and / cause problems. Otherwise leave it off.
- 3Copy the result or generate a data URICopy the encoded or decoded output, or for files use the data URI option to embed images and assets directly in HTML, CSS, or markdown.