Base64 Encoder & Decoder
Encode and decode Base64 with full Unicode support.
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About this tool
Base64 encodes binary data as ASCII text so it can travel through channels that only accept text — HTTP headers, JSON bodies, data URIs and email. This tool handles UTF-8 correctly, so emoji and non-Latin scripts survive a round trip.
When should you use Base64?
Use it for embedding small images as data URIs, passing binary payloads inside JSON, and encoding HTTP Basic Auth credentials. Base64 grows the payload by roughly 33 percent, so it is a poor fit for large files.
Base64 is not encryption
Encoding is fully reversible without any key. Never use Base64 to protect secrets — use real encryption and transport the result over TLS.
How to use Base64 Encoder & Decoder
- 1
Open Base64 Encoder & Decoder
Everything runs on this page — there is nothing to install and no account required to use the free features.
- 2
Add your input
Paste or enter your values in the panel above. The tool updates as you type, so you can iterate quickly.
- 3
Review the output
Check the result, copy it with one click, and adjust the options until it matches what your system expects.
- 4
Take it further
Use the developer & api tips below to make the result production-ready, then unlock the gated extras via the form above.
Best practices
- Work from a real payload, not a hand-typed sample — encoding bugs hide in whitespace and Unicode.
- Keep the transformation reproducible: script it in CI once you have confirmed the output here.
- Never paste live credentials, customer records or production tokens into any web tool you have not audited.
- Version the inputs and outputs you rely on so a teammate can reproduce the same result later.
Why Base64 Encoder & Decoder matters
Small integration details — an encoding, a claim, a header — are where most API bugs actually live, and they are expensive to find in production logs.
Getting them right in seconds keeps debugging sessions short and prevents malformed data from reaching downstream systems.
Related free & paid tools
| Tool name | Type | Key features | Link |
|---|---|---|---|
| CyberChef | Free | Chained encoding, decoding and binary recipes | Visit |
| OpenSSL base64 | Free | `openssl base64` for scripted, offline encoding | Visit |
| PostmanOffer | Freemium | Builds Basic-Auth headers and encodes bodies for you | Visit |
Links marked Offer may be partner links. They cost you nothing extra and never affect which tools we recommend.