ConvertBlink
EN

JPEG to Base64 Data URI Encoder, Free In-Browser

Encode a JPEG into a Base64 data URI you can paste into HTML, CSS, or JS. Runs fully in your browser, nothing uploaded. Copy the string in one click.

Browser Native
Privacy First
Free Tool

Convert Now

Drag & drop your file here

or

How It Works

A Base64 data URI lets a JPEG live inside the page itself instead of as a separate file the browser has to fetch. Drop in a .jpg or .jpeg and this tool decodes it locally, then hands you a single `data:` string you can drop into an `<img src>`, a CSS `background-image`, or a JavaScript variable. No asset folder, no build step, no extra HTTP round trip for that one image. One thing worth knowing about the output: the encoder decodes your JPEG and re-emits it as a PNG-backed data URI (`data:image/png;base64,...`). That re-wrap doesn't touch the pixels, but PNG stores them without JPEG's photographic compression, so the string is usually larger than the original .jpg, on top of the roughly one-third overhead Base64 text adds to any binary. Translation: use this for small assets like icons, sprites, and thumbnails, not a 4000px photo. The result lands in a text box with a Copy button, so you grab the whole string in one click. Everything runs in your browser. Your image is never uploaded, stored, or seen by a server, which you can verify by encoding with your network turned off.

Related Conversion Tools

Discover more powerful converters that might be useful for your workflow

JPEG Optimizer: Shrink JPG File Size with mozjpeg

Re-encode JPEGs with mozjpeg to cut file size at near-identical quality. Runs fully in your browser, no uploads, and never returns a bigger file.

.jpg.jpeg
Try Now

JPG to PDF: Merge Photos into One Multi-Page PDF

Merge multiple JPG photos into one multi-page PDF in your browser. Drag to reorder, add, or remove pages. JPGs embedded as-is, no re-compression, no uploads.

.jpg.jpeg
Try Now

Image to Base64 Data URI Encoder (JPG/PNG/GIF/WebP)

Encode a JPG, PNG, GIF or WebP into a Base64 data: URI you can paste into HTML, CSS or JS. Runs in your browser, files stay on your device.

.jpg.jpeg +3
Try Now

PNG to Base64 Converter: Encode PNG as a Data URI

Encode a PNG into a Base64 data URI in your browser. Paste it into HTML, CSS, or JS to inline small icons. No upload, one-click copy, lossless.

.png
Try Now

SVG to PNG Converter: Rasterize Vectors in Browser

Rasterize SVG vector files to PNG bitmaps in your browser. Keeps the alpha channel, controls output size, no uploads, no watermark, no sign-up.

.svg
Try Now

WebP to JPEG Converter: Fast, Private, In-Browser

Convert WebP to JPEG free in your browser. Files never leave your device, transparency flattens to white, and the JPEG opens in apps that reject WebP.

.webp
Try Now

MoreJPG

jpg optimizerjpg → pdf

Convert toBASE64

canvas → base64png → base64
View All Converters

Key Features

  • No file uploads required - works offline
  • 100% privacy focused - client-side processing
  • Browser powered - no software installation
  • Fast processing - WebAssembly technology
  • Free forever - no premium accounts

Supported File Formats

.jpg .jpeg

Output Format: Base64

Technical Specifications

input Format JPEG / JPG (.jpg, .jpeg)
output Format Base64 data URI text (data:image/png;base64,...)
compression Type Decoded then re-wrapped as lossless PNG; no second lossy JPEG pass
quality Retention Matches the decoded JPEG; no additional lossy re-compression added
color Space Support 8-bit RGB / RGBA via the browser Canvas pipeline
max Resolution Limited only by your device's memory
processing Time Instant, runs in your browser

Key Benefits

  • Cuts one HTTP request by inlining the image directly in your markup or styles
  • Produces a ready-to-paste data URI you copy whole with a single click
  • Runs 100% in your browser, the JPEG is never uploaded or stored
  • No second lossy compression pass, the decoded pixels are wrapped losslessly
  • Works offline once the page has loaded, useful on locked-down networks
  • Output drops straight into an HTML src, CSS url(), or a JS string with no escaping

Common Use Cases

  • Inlining a small icon or logo into a single-file HTML page or email template
  • Embedding a CSS background-image without shipping a separate asset file
  • Hardcoding a placeholder or sprite directly into a JavaScript bundle
  • Pasting an image into a Markdown or JSON document that can't reference external files
  • Storing a small image as a text field in a database or config file
  • Prototyping a component without setting up an assets folder
  • Sending a self-contained snippet that renders an image with zero dependencies

Pro Tips

  • Reserve this for small images, inlining big photos bloats your HTML and kills caching
  • Remember the string runs ~33% larger than binary, plus the PNG re-wrap overhead
  • A separately cached .jpg usually beats an inlined one for images reused across pages
  • Compress your source JPEG before encoding to keep the resulting string shorter
  • Let your server gzip or brotli the response, Base64 text compresses well on the wire
  • Keep the full data: prefix intact when pasting, browsers need it to detect the MIME type

Frequently Asked Questions

A single line starting with `data:image/png;base64,` followed by the encoded characters. The tool decodes your JPEG and re-emits it as a PNG-backed data URI, so the MIME prefix is `image/png` even though you fed it a JPEG. Browsers render it exactly like any image referenced in an `<img>` tag or CSS background.
In HTML, paste it into the src attribute: `<img src="data:image/png;base64,iVBOR...">`. In CSS, wrap it in url(): `background-image: url(data:image/png;base64,iVBOR...)`. In JavaScript, assign the whole string to a variable or set `element.src` to it. No extra encoding or escaping needed.
Two compounding reasons. First, Base64 text runs about 33% larger than the binary it represents, since it packs every 3 bytes into 4 ASCII characters. Second, this tool re-emits the decoded image as PNG, which doesn't use JPEG's lossy photographic compression, so the raw byte count grows before encoding even starts. Expect the string to be noticeably heavier than the .jpg you started with.
There's no second round of lossy JPEG compression. The tool decodes your JPEG once and re-wraps those exact decoded pixels as a lossless PNG inside the data URI, so what you get back matches the decoded source. The only compression in play is whatever was already baked into your original JPEG.
No. Inlining a big photo bloats your HTML or CSS, prevents that image from being cached separately, and can delay page render. Base64 inlining earns its keep for small images like icons, logos, sprites, and placeholders. For real photos, keep them as separate .jpg files the browser can cache and lazy-load.
No. Both the decode and the encode run in your browser using the Canvas API. The file never leaves your device, nothing is sent to a server, and nothing is stored. Disconnect from the network and it still works.
Yes, but with a different tool. This page only encodes JPEG to Base64. To go the other way, use a Base64-to-image converter that accepts a data URI or raw Base64 and writes out an image file.
No fixed cap from the format itself, only your device's available memory, since the whole image is decoded and held in the browser. Very large files produce very long strings that can be slow to paste into an editor. Small images are the sweet spot for inlining anyway.