Convert text to Base64 and back with one click. Supports Unicode.
Instantly swap input and output to go from encoding to decoding.
All processing in your browser. Data never leaves your device.
Upload any file and get its Base64 representation instantly.
0 characters
0 characters
Base64 is one of the most widely used encoding schemes in web development. This free tool lets you encode plain text into Base64 format or decode Base64 strings back to readable text — all directly in your browser with no server involved.
Base64 takes groups of 3 bytes (24 bits) and splits them into 4 groups of 6 bits. Each 6-bit group maps to one of 64 characters: A-Z (0-25), a-z (26-51), 0-9 (52-61), + (62), and / (63). If the input length is not a multiple of 3, padding characters (=) are added to the output. This process is fully reversible, making Base64 ideal for round-trip data encoding.
Base64 is an encoding scheme that converts binary data into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It is commonly used to embed images in HTML/CSS, transmit data in APIs, encode email attachments, and store binary data in text-based formats like JSON and XML.
Yes, completely free with no limits on usage. You can encode and decode any amount of text as many times as needed. No signup or account required.
Yes. All encoding and decoding happens directly in your browser using JavaScript. Your data is never sent to any server. This tool works even offline once the page is loaded.
Yes! Click the File button to upload any file. The tool will convert it to a Base64 string, which is useful for embedding images in CSS data URIs or storing files in databases.
Base64 encoding increases data size by approximately 33% because it represents every 3 bytes of binary data as 4 ASCII characters. This trade-off is necessary to safely transmit binary data through text-only channels.
Base64 is an encoding scheme, not encryption. It transforms data into a different format but provides no security. Anyone can decode a Base64 string. For security, use encryption algorithms like AES or RSA instead.
Explore more free tools to boost your productivity