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Why LMPB Tools?
Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
- No login required No account, no sign-up, no email. Just open a tool and use it.
- Fast No upload or download wait — results appear instantly.
- Free All tools are free to use, with no limits.
- Works everywhere Phone, tablet or computer, in any modern browser.
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Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
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Base64 Encoder / Decoder
Encode text or files to Base64 and decode Base64 back to text or a file. UTF-8, URL-safe, MIME line wrap and data URIs. Private.
Convert text to Base64 and back in one click, or turn any file — an image, a PDF, a font — into Base64 or a ready-to-paste data URI. When you decode, the tool recognises whether the result is text or a file (PNG, JPEG, PDF, ZIP…) and lets you preview or download it.
Text is handled as UTF-8, so accented letters, emoji and scripts such as Hindi or Chinese survive the round trip. Everything happens in your browser; nothing is uploaded.
How to use Base64 Encoder / Decoder
- Choose Encode or Decode.
- To encode, type or paste text — or pick “File” and choose a file. To decode, paste the Base64 text (a data: URI works too).
- Pick options if you need them: URL-safe, line wrapping at 76 characters, or a data: URI for files.
- Copy the result or download it. Decoded files can be previewed (images) and downloaded with the right file extension.
Features
- Text ⇄ Base64 with correct UTF-8 (emoji, accents, any language).
- URL-safe Base64 (- and _ instead of + and /, no padding) for URLs, JWTs and file names.
- MIME line wrapping at 76 characters for email and PEM-style output.
- File to Base64 or data: URI, with an image preview — handy for CSS and HTML.
- Base64 to file: the type is detected from the content (PNG, JPEG, GIF, WebP, PDF, ZIP, MP3, MP4, SVG…).
- Tolerant decoding: ignores spaces and line breaks, accepts missing padding and data: prefixes.
- Clear errors that point to the exact invalid character.
- Private: files and text never leave your device.
What is Base64?
Base64 is a way to write any data — text or binary files — using only 64 safe characters: A–Z, a–z, 0–9, + and /, with = as padding at the end. Every 3 bytes of data become 4 characters, so Base64 is about 33% larger than the original.
It is used wherever binary data has to travel through systems that only handle text: email attachments (MIME), data URIs in HTML and CSS, JSON APIs, JSON Web Tokens, basic HTTP authentication and certificates (PEM).
Base64 examples
Each group of 3 bytes becomes 4 characters. When the input is not a multiple of 3 bytes, = signs pad the end.
| Text | Base64 | Note |
|---|---|---|
| Man | TWFu | 3 bytes → 4 characters |
| Ma | TWE= | one = of padding |
| M | TQ== | two = of padding |
| Hello, world! | SGVsbG8sIHdvcmxkIQ== | |
| héllo | aMOpbGxv | é is 2 bytes in UTF-8 |
| 😀 | 8J+YgA== | an emoji is 4 bytes |
Standard vs URL-safe Base64
Standard Base64 uses + and /, which have special meanings in URLs and file names. URL-safe Base64 (also called base64url, RFC 4648 §5) replaces them with - and _ and usually drops the = padding. JSON Web Tokens use URL-safe Base64. This decoder accepts both automatically.
| Standard | URL-safe | |
|---|---|---|
| Characters 62 and 63 | + / | - _ |
| Padding | = at the end | usually none |
| Used in | email, data URIs, PEM, most APIs | URLs, JWT, file names, cookies |
Base64 is not encryption
Base64 only changes how data is written; anyone can decode it instantly, with no key. Never use it to hide passwords or secrets. To protect data, use real encryption — for example, to protect a PDF with a password, use Protect PDF.
Using images as data URIs
A data URI embeds a file directly in HTML or CSS, such as background-image: url(data:image/png;base64,iVBORw0…). It saves a network request for very small images and icons, but makes the page larger and is not cached separately, so it is best for files of a few kilobytes. Choose File, tick “As data: URI” and copy the result.
Frequently asked questions
Is this Base64 tool free and private?
Yes. It is free with no sign-up, and all encoding and decoding happens in your browser — your text and files are never uploaded.
Why does my decoded text show strange characters?
The text was probably encoded with a different character set (for example Windows-1252 instead of UTF-8), or it is not text at all but a file. This tool decodes text as UTF-8 and detects files automatically.
How do I convert an image to Base64?
Choose Encode, then File, and pick your image. Tick “As data: URI” if you want to paste it straight into HTML or CSS.
How do I turn Base64 back into an image or PDF?
Choose Decode and paste the Base64. The tool recognises images, PDFs and other files, shows a preview for images, and offers “Download file” with the right extension.
What does “not a Base64 character” mean?
The input contains a character that Base64 never uses, such as a quote, comma or an invisible character picked up when copying. The message gives its exact position so you can remove it.
Why is Base64 bigger than the original?
Base64 uses 4 characters for every 3 bytes, so it is about 33% larger (a little more with line breaks). That is the price of making binary data safe to send as text.
Is there a file size limit?
Files up to 200 MB can be encoded. Very large Base64 text may be slow to display on phones.