Base64 Decoder
Convert Base64 back into text, or decode it into a file you can download — for images, documents and more.
- Free
- No sign-up
- Runs in your browser
Your input is decoded locally in your browser and never uploaded.
How to use Base64 Decoder
- Paste the Base64 text — data: URLs, wrapped lines and URL-safe alphabets are handled automatically.
- Press “Decode”.
- Images appear as a live preview next to the download button; known file types offer a download; plain text appears in the output box.
- Copy the text result or download the file.
About this tool
When you receive data as Base64 — an image in an email, an attachment in a JSON file — this tool turns it back into its original form. Text is decoded as UTF-8, and files are offered back as a download.
When to use it: opening Base64 blobs from emails, APIs and data URLs.
Frequently asked questions
How do I know whether to decode as text or file?
If the Base64 came from text, decode to text. If it came from an image, PDF or other binary, choose “Decode to file”. The tool auto-detects common file signatures.
My Base64 has spaces or line breaks — is that a problem?
No. Whitespace is ignored automatically, so pasted blocks decode fine.
I decoded something and got gibberish — why?
The input was probably binary data, like an image or PDF, decoded as text. Use “Decode to file” instead and you will get the original file back.
What if my Base64 is inside a data URL?
Copy only the part after the comma — that is the actual Base64 payload; everything before it is just the MIME type label.
Is decoding unknown content safe?
Decoding itself is harmless — it only reveals bytes. Risk only appears if you then execute or open untrusted files, same as with any download.
Is large input slow?
No — decoding runs in efficient local chunks, so even long documents decode instantly.
Related tools
How to use Base64 Decoder
Paste your code, data, or URL into the Base64 Decoder input area. Select the appropriate mode or option, then process. The formatted or converted output appears clearly and can be copied or saved.
Practical benefits
- Complete tasks faster without installing additional software.
- Keep files private since processing happens in your browser.
- Produce consistent results that integrate into your workflow.
Frequently asked questions
Is this tool free to use?
Yes. Base64 Decoder is fully free with no account or subscription required.
Does it upload my files?
No. All processing occurs locally within your browser session.
Can I use this for professional projects?
Yes, the tool is designed for both casual and professional use. Always verify critical outputs.