Decode Base64 in seconds. Supports text/string/file and data URI image preview, real-time conversion, URL-safe, copy & download. 100% local, no upload required.
✧Base64 Decode / Encode
No upload · Local only · Instant
Ready - paste to base64 decode or encode online
This free Base64 decoder also supports Base64 encoding. Paste text or a data URI, toggle URL-safe, and convert instantly — a practical Base64 converter for developers.
100% browser-local
Encoding and decoding happen on your device — content is never uploaded
No backend storage
Tokens, strings, and files stay in the current tab
Privacy by design
No account required to use this tool
What is Base64 decoding
What is Base64 decoding? Convert Base64 back to text online
Base64 decoding converts Base64 text back into bytes or readable strings. It's often used to inspect API tokens, JSON payloads, email MIME, or binary attachments in transit.
Base64 is encoding, not encryption. A good online tool should also support encoding, character sets, line-by-line decoding, and URL-safe (base64url).
Base64 Decode
Convert Base64 text back to raw bytes or UTF-8 strings.
Base64 Encode / Text to Base64
Encode plain text or binary into Base64 for transmission in JSON/XML/URLs.
b64 decode
Abbreviated search intent for the same decoding action.
Base64 Converter
Encode and decode in the same interface.
Base64 Image Decode
Decode data URIs or raw Base64 into previewable PNG/JPEG.
Base64url Encoding
Uses the URL-safe alphabet with -/_ and can omit padding.
String to Base64
Encode Unicode strings using the selected character set (usually UTF-8).
Base64 File Decode
Read Base64 from a text file and download the binary result.
How to Use
How to Base64 decode online (3 steps)
1
Paste Base64 or plain text
Paste Base64 for decoding; paste plain text for encoding. You can also choose a file.
2
Choose options and convert
Select character set, real-time, line-by-line, or URL-safe. Click convert, or enable real-time mode to convert as you type.
3
Copy, download, or preview
Copy the result, download text/binary, or preview the decoded image. Data never leaves your browser.
BASE64 IMAGE DECODE
Base64 Image Decode — Data URI Preview in Browser
Dealing with Base64 images? Paste data:image/...;base64,... to preview and download — ideal for CSS, email HTML, and design handoff.
How to safely decode Base64 images
1Paste the full data URI or the raw Base64 of the image.
2Keep decode mode; use UTF-8 for text metadata.
3Confirm the preview looks correct (auto-detects PNG/JPEG/GIF/WebP).
4Download binary when you need the resource file.
5Prefer local tools when handling private screenshots.
6Keep data URIs for CSS scenarios; download binary for file scenarios.
Why local? Image Base64 often contains product UI or private information; don't upload it casually. Tip Very large data URIs may be slow; use file mode for multi-MB binaries.
Fits design and email workflows
Decode assets from Figma exports, MIME parts, or CMS fields without installing desktop software.
From Base64 to PNG in seconds
Paste, preview, download — a Base64 decoder focused on image payloads.
Online Tools
Free Base64 decoder vs desktop tools
Sites like base64decode.org popularized browser-based encoding and decoding. Desktop plugins and CLI tools work offline — this page covers the same core path, plus real-time, URL-safe, file encoding, and image preview, all within the tab.
Use Cases
Text to Base64, files, JSON, and URL-safe strings
When you need Base64 conversion, encode or decode locally:
API tokens and headers
Quickly decode Basic Auth or opaque tokens.
Base64 to JSON payloads
Decode JSON wrappers in webhooks / feature flags.
Text to Base64 in configs
Encode keys or certificates into YAML/JSON configs.
Email MIME / attachments
Restore attachment bytes from MIME Base64.
Data URI images
Preview and export Base64 images from HTML/CSS.
String to Base64
Encode Unicode strings with UTF-8 for API use.
Base64url / JWT-like strings
Toggle the switch when handling URL-safe segments with or without padding.
File to Base64
Encode local files into Base64 for plain-text channel transmission.
JS debugging
Check network trace data against atob/btoa behavior.
Line-by-line batch
Decode multiple Base64 lines separately.
Features
Local Base64 encoding and string decoding
Real-time encode/decode
Optional real-time mode updates as you type — UTF-8 by default.
URL-safe + line-by-line
base64url alphabet and batch line-by-line decoding.
File and image preview
Encode files to Base64; decode PNG/JPEG/GIF/WebP with preview.
About This Tool
Online Base64 Decode — No Upload Required
Base64 is everywhere: APIs, email, CSS, configs. Whether you need online decoding, text to Base64, or a quick check of Base64 images, this page keeps the process in your browser.
A focused single-page tool — dual text areas, character sets, real-time mode, copy/download — for developers who need reliable encoding/decoding without signing up.
FAQ
Online Base64 Decode — Frequently Asked Questions
What is Base64 decoding?
It converts Base64 text back into raw bytes or strings. It's the inverse of encoding, not decryption.
How do I Base64 decode online for free?
Paste Base64 into the input box, choose decode, and convert (or enable real-time). Everything happens locally in your browser.
Can I encode and decode on the same page?
Yes. Toggle between encode/decode modes for two-way conversion.
How do I decode Base64 images?
Paste a data URI or raw image Base64. If it's PNG/JPEG/GIF/WebP, a preview will appear and you can download it.
What is base64url?
URL-safe Base64 uses -/_ instead of +/ and often omits padding. Turn on URL-safe when handling tokens or query strings.
How do I convert text/string to Base64?
Select encode mode, paste your text, use UTF-8 by default, convert, then copy or download.
Does it support Base64 to JSON?
Decode first; if the payload is UTF-8 JSON text, the output area will show readable JSON.
Is my data uploaded?
No. Encoding and decoding happen locally. This tool is better suited for tokens or private screenshots.
How is this different from base64decode.org?
It covers the same encoding/decoding and character set/real-time options, but adds URL-safe, file encoding, and image preview, with a developer-oriented dark tool interface.
Which character set should I choose?
Use UTF-8 for modern text. Only choose ASCII/Latin-1 if you're sure the original encoding is that.
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