Base64 Encoder
& Decoder
Encode · Decode · Files · Images · URL-safe · History
Everything Base64 can do
Keyboard Shortcuts
FAQ
Base64 is a binary-to-text encoding scheme that converts binary data into 64 printable ASCII characters. It is used in data URIs, API authentication (Basic Auth), email attachments, and anywhere binary data needs to travel over text-based systems.
Make sure Encode mode is selected, type or paste your text in the left panel, and click Convert (or press Ctrl+Enter). The Base64 string appears instantly on the right. You can then copy it or download it.
Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces + with - and / with _ so the string can be used safely in URLs, HTTP headers, and filenames without percent-encoding. Toggle it with the switch above the input.
Yes. Drag any file onto the drop zone or click to browse. The tool reads it locally using the FileReader API and converts it to a Base64 data URI. Images are shown as a live preview. No file is ever uploaded to any server.
Base64 encodes every 3 bytes of data as 4 characters, adding approximately 33% overhead. This is expected — Base64 is not a compression format. It is a text-safe representation of binary data. The size ratio bar in the output shows you the exact increase.
Free Base64 Encoder & Decoder Online — Fast, Private, Professional
The YouKip Base64 Tool is the most complete free Base64 utility in 2026. Whether you're a developer encoding API credentials, a designer embedding images as data URIs, or a student learning about encoding, this tool handles everything instantly.
Encode any text including Unicode characters and emoji. Decode any Base64 string with precise error detection. Convert entire files — images, PDFs, text — to Base64 data URIs. Toggle URL-safe mode for JWT tokens and HTTP headers.
All processing runs entirely in your browser. Your text and files never leave your device. No server, no tracking, no account needed. The tool works offline after the first load. Free forever.
