Base64 Decoder
Decode Base64 to text
What Is a Base64 Decoder?
A Base64 decoder converts Base64-encoded text back into its original format — whether that is plain text, binary data, or an embedded image. Base64 encoding is used to safely transmit binary data as text in emails, URLs, JSON, and APIs. Tooliva's free online Base64 decoder processes conversions instantly in your browser with no server uploads.
Why Use Tooliva's Online Base64 Decoder?
Developers frequently encounter Base64-encoded strings in API responses, JWT tokens, HTML data URIs, and configuration files. You need a fast, reliable way to decode them without writing a script. Tooliva decodes any Base64 string instantly, shows the result in multiple formats, and keeps everything private through client-side processing.
How to Decode Base64 Online
- Paste your Base64-encoded string into the input area.
- Click Decode and the tool converts it back to the original format.
- Copy the decoded output or download it as a file.
Key Features
- Multi-format output — view decoded text, hex, or download as a file
- Handles all Base64 variants — standard, URL-safe, and MIME encoded strings
- Instant decoding — processes strings of any length in milliseconds
- Error detection — alerts you to invalid Base64 input
- Free and private — no sign-up, no uploads, browser-based
Common Use Cases
API developers decode Base64-encoded responses to inspect binary data. Security analysts decode JWT tokens to examine payload contents. Web developers decode data URIs to extract embedded images. Email processors decode MIME-encoded attachments. Database administrators decode stored Base64 strings for data migration.
Frequently Asked Questions
Q: What is Base64 encoding?
Base64 encodes binary data as printable ASCII characters using 64 characters: A-Z, a-z, 0-9, +, and /. It is used to safely transmit binary data through text-only channels like email, JSON, and URLs.
Q: Can I decode URL-safe Base64?
Yes. The decoder handles standard Base64, URL-safe Base64 (which uses - and _ instead of + and /), and MIME-encoded strings with line breaks.
Q: Is there a size limit?
The decoder handles strings of any length, limited only by your browser's memory. Very large strings may take a moment to process.
Q: Is the decoding private?
Yes. All decoding happens in your browser. Your data never leaves your device.