Base64 to Image
Paste a Base64 string or data URL and instantly preview the decoded image — free online converter supporting PNG, JPEG, WebP, GIF, SVG. No upload, runs locally.
Updated March 2026
Paste a Base64 string above to preview the image
Instant Decoding
Renders images from Base64 strings instantly, directly in the browser.
Local Processing
Your data never leaves the browser — no uploads, no server.
Format Detection
Auto-detects JPEG, PNG, GIF, and WebP from Base64 magic bytes.
How to convert Base64 to image
No upload, everything runs locally
1. Paste the string
A full data URL (`data:image/...;base64,`) or raw Base64 — the tool detects the format on its own.
2. Preview the image
The image renders instantly, along with its dimensions, format, and encoded size.
3. Download it
Save the result as PNG, JPEG, WebP, or GIF straight to your device.
What this Base64 to image converter does
More than just rendering the picture
Detects the format automatically
Reads the magic bytes of the decoded output, so you don't need to know the MIME type ahead of time.
Accepts raw Base64 or a full data URL
Strips data:image/...;base64, prefixes and cleans up whitespace, line breaks, and JSON escape characters on its own.
Shows the image metadata
Dimensions, decoded size, and encoded payload size — all before you decide to download.
Runs 100% in the browser
Decodes and renders locally with atob() and the native Blob/Image APIs — nothing leaves your device.
Examples
When you'll reach for this tool
The most common scenarios among people who use this converter
Debug an API response
Avatars and thumbnails often come back as a Base64 string buried inside a JSON payload.
Validate a data URI in CSS
Confirm an inline icon or background actually decodes to the asset you expect before you commit it.
Recover an image from an export
Database dumps and XML/JSON exports sometimes store images as Base64 blobs.
Inspect an image inside an email
MIME emails embed logos and signature images as encoded parts.
Test an encoding pipeline
Verify that the output of an encode script or API decodes back to the correct picture.
Go the other direction
To encode an image file into Base64 instead, use [Image to Base64](/en/tools/image-to-base64).
Nothing renders? Start here
Truncated string
If only a fragment got copied, the image won't decode. Check that you captured the entire string — a valid payload's length is a multiple of 4.
URL-safe Base64 instead of standard
Strings pulled from a URL often use -/_ instead of +// — swap the characters back before pasting.
Not actually an image
The decoded bytes need to match an image format the browser recognizes — text or binary data that isn't an image will fail to render.
Why decode Base64 to image here
All decoding and rendering happens locally with atob() and the native Blob and Image APIs — your image never leaves your device, and the tool keeps working offline once it's loaded.
Automatic format detection via magic bytes skips the manual step of figuring out the MIME type — paste raw Base64 or a full data URL, either works the same way.
Frequently asked questions
Yes. The tool reads the magic bytes at the start of the decoded data to detect the format and builds the correct data URL internally, so a bare Base64 string works just as well as a full data URI.
References
Related Tools
- Image to Base64 Developer Upload any image and convert it to a Base64 data URL ready for HTML, CSS, or JSON — free online converter supporting PNG, JPEG, SVG, WebP. No server upload.
- Base64 Decoder Developer Free online Base64 decoder — decode Base64 strings back to plain text instantly in your browser. Validates input and shows decoded payload size.
- Base64 Encoder Developer Encode any text or string to Base64 instantly in your browser. Supports UTF-8, shows character count and output payload size. Free, no signup, 100% client-side.
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