Encode text or files to Base64 and decode Base64 strings instantly online. Free Base64 encoder decoder — handles UTF-8, binary data, and files. No signup required.
Base64 encoding is used throughout web development: embedding images directly in CSS or HTML via data URIs, encoding binary file attachments in JSON API payloads, storing binary data in environment variables, and working with authentication tokens. The decoder is equally important for inspecting encoded data received from external APIs or email systems.
All processing for Base64 Encoder & Decoder runs entirely in your browser. Your data — whether text, files, or other content — is never transmitted to any server. DevToolHub has no backend that receives or stores your inputs. This means the tool works even offline once the page has loaded, and there is no risk of your data being intercepted or stored by a third party.
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not an encryption algorithm. It can be easily reversed by anyone and provides no security — it should not be used to protect sensitive information.
Why does my encoded text have = or == at the end?
This is padding. Base64 works in chunks of 3 bytes represented as 4 characters. If the input data is not a multiple of 3, padding characters are added to make the output a multiple of 4.
What is the difference between Base64 and Base64Url?
Standard Base64 uses + and / characters which have special meaning in URLs. Base64Url replaces + with - and / with _, and omits padding = signs. JWT tokens use Base64Url encoding for this reason.
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