Step 1
Open the tool and upload your file (drag-and-drop or browse).
Drag & drop files here or click to browse
Max 20 files • Max file size: 50MB • Supported: .bmp, image/bmp
Encode BMP images to Base64 text online. Free, in-browser, no watermark. Download as .txt or .b64.
Encode BMP to Base64 in seconds. All processing runs in your browser.
Base64 encoding turns binary data (e.g. BMP) into text. Useful for data URIs, APIs, and embedding.
Free, in-browser, no uploads, no watermark. Output as .txt or .b64.
Follow these steps:
Open the tool and upload your file (drag-and-drop or browse).
Choose output format (.b64 or .txt). Click Convert to Base64.
Start conversion and download your output when it is ready.
Yes — Asli Tools provides free access without forcing registration for this workflow.
No installation is required. Use a modern desktop or mobile browser and run the tool online.
When processing is client-side, your files stay on your device and are not uploaded to our servers for conversion.
Current versions of Chrome, Firefox, Safari, and Edge generally work best.
Yes — the tool is designed to work on phones and tablets as long as your browser supports the required features.
Highlights:
Typical situations:
Base64 turns binary data into text. Use it for data URIs in HTML/CSS, embedding images in JSON or APIs, or when a system accepts only text. The encoded string is about 33% larger than the original file.
Before you convert:
Free BMP to Base64 encoder. Download as .txt or .b64.
Bookmark this page if you repeat the same conversion often, and explore related tools below for the next step in your project.
Have more questions? Don't hesitate to email us:
Yes — this tool is offered as part of Asli Tools’ free online utilities.
No account is required to start using this converter.
Many Asli Tools converters run client-side; when that applies, your file is processed locally in your browser.
Modern phones, tablets, and desktops with an up-to-date browser work well.
Try a smaller file, a different browser, or re-export the source file from the original app.
If the tool supports batch mode, use it after reading any on-page limits for file count and size.
Limits depend on the tool and your device memory; check the upload hint on the tool page.
Use the Related tools section on this page to jump to adjacent converters.
Yes. Copy or download the string for use in data URIs or APIs.
Base64 encoding increases size by about 33%. It is text representation of the binary.
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