Base64 Encode / Decode
Encode and decode Base64 text safely.
✓ Professional standard Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Base64 Encode / Decode is a free online converter from Toolinza. Encode and decode Base64 text safely. It runs entirely in your browser — your data is never uploaded — needs no signup, and works on any device. Toolinza offers 293+ free tools used by people across the UK, USA, Canada, Australia, the EU, India, Pakistan, the Middle East and worldwide.
Loading tool…
About the Base64 Encode / Decode
Base64 encoding turns binary or text data into plain ASCII so it can travel safely through systems that only handle text — email, data URIs, JSON and APIs. Developers encode and decode it constantly, and doing so on a random website risks exposing sensitive data.
This Base64 Encode / Decode tool converts text to and from Base64 entirely in your browser, so your data stays private.
How to use the Base64 Encode / Decode
- Paste your text or Base64 string.
- Choose encode or decode.
- The tool converts it instantly.
- Copy the result.
Key features of the Base64 Encode / Decode
- Encodes and decodes Base64 text
- Runs locally — data never uploaded
- Handles Unicode safely
- Fast and simple
- Free with no signup
How the Base64 Encode / Decode works
Every conversion uses the exact, internationally agreed factors defined by the International System of Units (SI) and recognised standards bodies. Temperature conversions apply the correct formulas rather than simple multipliers, and results retain full precision so they are suitable for scientific, engineering and everyday use alike.
All conversions are calculated instantly in your browser.
Tips & best practices
- Base64 is encoding, not encryption — it obscures data but does not secure it, so never rely on it to protect secrets.
- Because it runs in your browser, it is safe to decode tokens and sensitive strings without exposing them online.
- Base64 increases size by about a third, so it is best for small pieces of data.
Standards & accuracy
Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Results are accurate to standard conversion factors. For everyday use you can round sensibly; for scientific, medical or engineering work, keep the full precision the tool provides.
Who uses the Base64 Encode / Decode?
- Encoding data for data URIs
- Decoding Base64 from APIs and tokens
- Embedding small assets in code
- Developer debugging and testing
Privacy & security
The Base64 Encode / Decode runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.
Why choose Toolinza?
- 100% free — no hidden charges, watermarks or usage caps.
- Private & secure — your data stays on your device.
- Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
- Works everywhere — desktop, tablet and mobile.
Frequently asked questions
It encodes binary or text data as plain ASCII so it can pass safely through text-only systems like email, data URIs and JSON. The tool encodes and decodes it.
No. Base64 is encoding, not encryption. It obscures data but anyone can decode it, so never use it to protect passwords or secrets.
No. Encoding and decoding happen in your browser, so your data never leaves your device — safe for tokens and sensitive strings.
Yes. The Base64 Encode / Decode is completely free with no signup, no watermarks and no usage limits. Toolinza is supported by unobtrusive advertising so every tool stays free.
Absolutely. This tool runs entirely in your browser — your data and files are never uploaded to any server, so everything stays private on your own device.
No. The Base64 Encode / Decode works instantly in any modern web browser on desktop, tablet and mobile — Windows, macOS, Linux, Android and iOS.