Convert · Browser-first processing
Use encode mode for HTML/CSS embedding or decode mode to inspect and save a valid image data string.
Select a supported file or enter the requested values, then run the tool.
Closing or refreshing this page clears the selected files and generated result. Downloaded files are created as new copies and never overwrite the source.
Common questions
Base64 Image Encoder and Decoder reads the selected input into browser memory and performs its documented operation on this device. It does not submit the source file to ImgNimble while using this browser-first workspace.
A Base64 data URL or a decoded image blob.
Base64 increases size by roughly one third and is unsuitable for large web assets. Only supported image MIME types are previewed.
Practical checks
Use encode mode for HTML/CSS embedding or decode mode to inspect and save a valid image data string.
Keep the source, download the Base64 Image Encoder and Decoder result as a new file, and verify dimensions, transparency, colour, metadata and visual detail before replacing any production asset.
Continue the workflow
Clean common SVG metadata and render the result as PNG or JPG without submitting the vector source.
Compress JPEG, PNG and WebP images locally with a quality slider and an exact before-and-after file-size report.
Create exact-size placeholder images with custom colours, text, format and optional grid lines.