InstantToolsPro
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InstantToolsPro
Encode text and files to Base64 or decode Base64 back to plain text — with auto-detection, live conversion, image preview, and developer options.
Type text directly or upload a file (image, PDF, or text). It converts automatically.
The tool detects if your input is plain text (→ encode) or Base64 (→ decode) automatically.
Result updates as you type. Use developer options for URL-safe, no-padding, or line wrap.
One-click copy output to clipboard or download as a .txt file.
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A–Z, a–z, 0–9, +, /). It is used extensively in web development: embedding images directly in HTML/CSS as data: URIs, encoding email attachments (MIME), transmitting binary data in JSON APIs, and encoding credentials in HTTP Basic authentication headers.
Encoding converts plaintext or binary data into a Base64 string (roughly 33% larger). Decoding reverses this process. This tool auto-detects which operation is needed: if your input matches the Base64 character set pattern, it decodes; otherwise it encodes.
Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces these with - and _ respectively, making the output safe to include directly in URLs and query strings without percent-encoding. Enable this with the "URL-safe" developer option above.