Base64 to WebP Decoder Online
Decode Base64 to WebP image - preview, copy, download. Detects declared vs actual format. Free, client-side, instant, offline, secure.
Decode Base64 (raw or data:image/webp;base64,... URI) into a WebP image. Preview in-browser, copy to clipboard, or download. Detects magic bytes so you’ll see if your input is actually PNG or JPEG pretending to be WebP.
How to Use Base64 to WebP Decoder Online
- Paste or upload. Drop a
.txtfile onto the upload area, click “Upload .txt”, or paste the Base64 directly into the textarea. Both raw Base64 anddata:image/webp;base64,...data URIs work. - Watch the magic-byte detection. The stats line shows
detected: webp,detected: png, etc - read from the first 12 bytes after decoding, independent of any declared prefix. - Spot declaration mismatches. If the input says
data:image/webp;base64,...but the actual bytes are JPEG, you’ll get a warning toast. This catches mislabelled Data URIs that other tools silently accept. - Check the dimensions. Once the preview loads, the stats line picks up
1920×1080(or whatever) from the image’snaturalWidth/naturalHeight- useful for verifying your encoded asset is the size you expected. - Copy the image. The Copy button writes the Blob to clipboard via
ClipboardItem- paste directly into Google Docs, Figma, Slack, etc. If the browser blocks image clipboard for this format (mostly non-PNG), we fall back to copying the data URI string. - Download the file. The Download button names the file by the detected format - if your input was PNG disguised as WebP, you get
decoded-….pnginstead of a broken.webp. - Keyboard shortcut:
Ctrl+Enter(orCmd+Enteron Mac) decodes the current input.
Frequently Asked Questions
What is WebP?
WebP is a modern image format developed by Google that offers better compression than JPEG and PNG while supporting transparency and animation. It is widely supported across browsers.
Can I decode any Base64 as WebP?
The tool validates that the decoded bytes start with the WebP signature (RIFF container). If the content is actually a different format, the tool warns you and shows the detected type.
What is the declared vs actual format check?
Some Base64 strings have a data URI prefix claiming a MIME type. The tool compares that declaration to the detected format from the decoded bytes, catching mismatches.
Can I preview the image?
Yes. After decoding, the WebP image is rendered inline so you can verify it is the expected picture before downloading.
Does the tool support URL-safe Base64?
Yes. Both standard Base64 and URL-safe Base64 with – _ are handled, along with missing padding auto-fix.
Is my image data private?
Yes. All decoding runs in your browser. The Base64 string and the resulting WebP image never touch a server.
Is this tool free?
Completely free, no sign-up, no limits.
Can I download the WebP file?
Yes. After a successful decode, a Download button saves the result as a proper .webp file ready to use in browsers or image editors.
What browsers can display WebP?
All modern browsers support WebP: Chrome, Firefox, Safari 14+, and Edge. For older browsers, convert the WebP to JPEG or PNG after decoding.
How large an image can I decode?
There is no strict limit, but very large Base64 strings (tens of megabytes) may be slow to decode in the browser. Most web WebP files decode in under a second.