DEVELOPER TOOL
Convert text and files to Base64 and back. UTF-8 safe, standard and URL-safe variants, drag-drop file upload.
Base64 is an encoding that represents binary data — like images or files — using only 64 printable ASCII characters. This tool converts text and files to Base64 and back, and supports both the standard variant (+, /) and the URL-safe variant (-, _). It handles emoji, Korean, and newlines without data loss via UTF-8, and every conversion runs inside your own browser.
1. Choose the encode or decode direction and the standard or URL-safe variant. 2. Type text or upload a file. 3. The result appears instantly, ready to copy or download as a file. When decoding, paste Base64 (or a data: URI) that encodes an image (PNG, JPEG, GIF, WebP, BMP, ICO, SVG) and the tool detects it automatically and shows a preview right away.
Inlining small images, icons, fonts (woff2), or SVG as data: URIs in CSS or HTML to cut requests, inspecting Base64-wrapped data like an email attachment (MIME) or a certificate or key (PEM), carrying a binary such as a PDF inside JSON, XML, or a URL, or building an 'Authorization: Basic' header.
Base64 is not encryption — anyone can reverse it, so never use it to protect passwords or personal data. Encoding to Base64 makes data about 33% larger, so it's not suitable for big files. If the value goes into a URL or a file name, choose the URL-safe variant that uses - and _ instead of + and /.
No. Base64 is encoding, not encryption. Anyone can decode Base64, so it provides no security. Do NOT use Base64 to protect sensitive information. Use proper encryption instead.
Standard Base64 uses + and / characters. URL-safe variant replaces these with - and _ to make it safe for URLs and filenames.
This tool can handle files up to 5MB. For larger files, you may need to process them in multiple parts.
No. All processing happens in your browser only. Nothing is sent to or stored on any server. Only your last used mode preference is stored locally.
Yes. In the decode direction, paste the Base64 (or a data:image URL) of an image such as PNG, JPEG, GIF, WebP, BMP, ICO, or SVG and the tool recognizes it, renders a preview, and offers download and copy buttons. Non-image data is still decoded as text.
Common uses include inlining small images, fonts, and SVG as data: URIs on the web; email attachments (MIME); storing certificates and keys (PEM) or Kubernetes Secrets; carrying binaries such as PDFs inside JSON, XML, or URLs; building 'Authorization: Basic' headers; and decoding JWT segments or unknown Base64 blobs to inspect their contents.