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Base64 Encode / Decode
Encode text and files to Base64, decode Base64 back instantly.
Your files are processed directly on your device and are not uploaded to our servers.
Good to know
Base64 output is ~33% larger than the input. It is not encryption — anyone can decode it. Never paste secrets here on a shared computer without clearing afterwards.
How to use
- Pick a mode: encode or decode, text or file.
- Paste text or choose a file — the result appears instantly.
- Copy the result or download it, then optionally support TinyTools.
FAQ
- Is my data uploaded anywhere?
- No. Encoding and decoding run entirely in your browser with the Web Crypto and TextEncoder APIs. Nothing ever leaves your device.
- What is Base64 used for?
- Base64 turns binary data into plain ASCII text so it can travel inside JSON, URLs, emails, and data-URIs. It makes files ~33% larger — it is an encoding, not compression or encryption.
- Why does decoding fail?
- The input may have typos, missing padding (=), or line breaks copied from an email. Re-copy the full string, or try the URL-safe variant toggle if it contains - and _ instead of + and / (not yet supported — convert those characters first).
- What file size can I encode?
- Files up to ~20 MB work smoothly. Larger files still work but the output string gets huge — consider whether you really need it inline.