HEIC to Data URL Converter: Free, Private, No Upload
Convert HEIC files to Data URL in your browser. Smaller output file, batch up to 20 files at once, no upload, no account, no watermark. Your files never leave your device.
- HEIC to Data URL
- Batch up to 20 files
- No upload, no account
- Metadata stripped
- 1Add up to 20 images
- 2Pick from 18 formats
- 3Download or copy the code
Processed on your device. Your images are never uploaded, and metadata is stripped. How we keep it private
How do I convert HEIC to Data URL for free?
Drop your HEIC files into the tool above, choose Data URL as output, and download the result. Everything runs in your browser, so nothing is uploaded and there is no limit or watermark. It works on Windows, Mac, Linux, ChromeOS, iOS and Android — anywhere you have a modern browser.
- Price
- Free, no credits and no daily cap
- Account required
- No
- File uploaded to server
- No, processed locally in your browser
- Batch limit
- Up to 20 files at once
- Input format
- HEIC
- Output format
- Data URL
- Best for
- Data URL workflows, smaller files, faster sharing
- Works on
- Chrome, Edge, Firefox, Safari, iOS and Android browsers
- Privacy
- No upload, no tracking, metadata stripped
- Output quality
- Adjustable 1-100, defaults to 90
How to convert HEIC to Data URL
- 1
Drop your HEIC files
Drag up to 20 HEIC files onto the page or click to choose them. Everything runs in your browser.
- 2
Data URL is preselected
Output is already set to Data URL. Adjust quality, resize or batch if you want.
- 3
Download
Save each Data URL, or download all of them together as a ZIP.
HEIC to Data URL: what changes and when it makes sense
HEIC is a High Efficiency Image Container (HEIF using HEVC compression). It is best known for photos at roughly half the size of JPG, with 10-bit colour and depth data on iPhones. The main drawbacks are patchy support across web tools, editors and upload forms because of HEVC licensing.
Data URL is not an image format. It is a Data URL (the data: URI scheme) that wraps the image data as text. Its main appeal is embedding small images directly in HTML, CSS or JSON with no extra network request. The main drawbacks are a size about a third larger than the original, no separate caching and awkward editing.
HEIC vs Data URL at a glance
| Property | HEIC | Data URL |
|---|---|---|
| Type | Container format | Text encoding of an image |
| Compression | Lossy HEVC compression, typically roughly half the size of JPG at similar quality | The image bytes are written out as Base64 text, which adds about 33 percent to the size |
| Transparency | Full alpha channel with soft edges | Same as the embedded image |
| Animation | No | Same as the embedded image |
| Colour depth | 8 to 16 bits per channel, with wide-gamut Display P3 colour on iPhones | Same as the embedded image |
| Support | Native on Apple devices and recent Windows and Android, but browsers other than Safari cannot display it | Works in all modern browsers, though very long strings can hit limits in some older browsers and email clients |
| History | HEIF was defined by MPEG in 2015. Apple adopted HEIC (HEIF with HEVC) as the default iPhone photo format in iOS 11 (2017). The move roughly halved storage usage compared to JPG. | The data: URI scheme was standardised in RFC 2397 in 1998 by Larry Masinter at Xerox PARC. It became widely used in the 2010s for embedding small icons and CSS backgrounds without extra HTTP requests. |
What actually changes in this conversion
- Data URL is an encoding of the image data, not a new compression scheme. The text is about a third larger than the binary file, so what you gain is portability rather than a smaller size.
- Transparency follows the image data being encoded. Data URL itself is only a text wrapper.
- Browser-based conversion works in 8-bit sRGB. Wide-gamut, 10-bit and 16-bit data are reduced. For colour-critical work, keep the original.
- EXIF, GPS and camera data are stripped on every conversion. That is good for privacy, but you lose capture dates.
About HEIC: history and technical details
HEIF was defined by MPEG in 2015. Apple adopted HEIC (HEIF with HEVC) as the default iPhone photo format in iOS 11 (2017). The move roughly halved storage usage compared to JPG.
Technical: HEIF container holds HEVC-encoded image data plus metadata, thumbnails, and auxiliary images. HEVC (H.265) compression is roughly 2x more efficient than JPG. iPhone HEIC files use 10-bit Display P3 colour space.
Real-world size: An iPhone HEIC file is typically 1.5-2.5 MB, compared to 3-5 MB for the same photo as JPG. Windows 10 requires the HEIF Image Extensions from Microsoft Store to open it. Windows 11 has built-in support.
Popular tools: iOS Camera, macOS Preview, Adobe Photoshop 2021+, Adobe Lightroom 2018+, Windows 11 Photos, ImageMagick.
Alternatives: JPG (universal), PNG (lossless), WebP (modern web), AVIF (future web).
About Data URL: what you get
The data: URI scheme was standardised in RFC 2397 in 1998 by Larry Masinter at Xerox PARC. It became widely used in the 2010s for embedding small icons and CSS backgrounds without extra HTTP requests.
Technical: Format: data:[<mediatype>][;base64],<data>. For images: data:image/png;base64,iVBORw0KGgo... The base64 encoding expands data by ~33%. Browsers typically cap data URLs at 2 MB (Chrome, Firefox); Safari has higher limits.
Real-world size: A 5 KB PNG becomes ~7 KB as base64 data URL. A 50 KB image becomes 67 KB. Best practice is to use data URLs only for images under 10 KB where the extra request overhead would dominate.
Popular tools: Webpack (asset/inline), Vite (assetsInlineLimit), Next.js (dangerouslyAllowSVG), online base64 converters.
Alternatives: External image file (cacheable), SVG inline (vector), HTTP/2 push (deprecated), font-based icons.
Browser and software compatibility
HEIC: Native on Apple devices and recent Windows and Android, but browsers other than Safari cannot display it. Data URL: Works in all modern browsers, though very long strings can hit limits in some older browsers and email clients.
Data URLs work in all modern browsers. Very long strings can hit length limits.
Why people move away from HEIC
- Most websites, forms and older Windows or Android devices cannot open HEIC.
- Browsers other than Safari cannot display HEIC, so it cannot be used on web pages.
- Email and messaging apps sometimes convert HEIC unpredictably, or refuse it.
Why people choose Data URL
- A data URL puts an image straight into HTML, CSS or JavaScript, removing a network request.
- It is handy in single-file HTML pages, email templates, test fixtures and demos that cannot rely on external files.
- Tiny icons and low-quality placeholders are the best fit.
Common mistakes with HEIC
- Trying to upload HEIC to forms that only accept JPG
- Expecting Windows 10 to open HEIC without the extension
- Losing location data — HEIC to JPG strips GPS
Best practices for keeping quality
- iPhone HEIC files use the Display P3 colour space. A browser conversion maps colour to sRGB, which can slightly mute very saturated colours.
- Live Photo motion and depth data are not carried over. You get the still image only.
- Keep encoded images small, ideally a few KB. Base64 adds about a third to the size, and the browser cannot cache an inline image separately.
- Compress or resize the image first, then encode it.
- Resize before converting if the image will be shown small. A 4000 pixel photo displayed at 800 pixels wastes bytes in any format.
- Check the result at 100 percent zoom, especially around text, edges and gradients, before you replace any originals.
- Keep your original files. Conversions to a lossy format cannot be undone.
- When you convert a set of images, use the same quality setting for the whole batch. The converter handles up to 20 files at once.
HEIC to Data URL questions
Quick answers about privacy, quality, supported formats, file limits and how Data URL works.
Why convert HEIC to Data URL?
Data URL files are typically smaller than HEIC, which makes them faster to share, send and load. The trade-off is a small amount of image detail at low quality settings.
Will converting HEIC to Data URL lose quality?
At 90% quality, most people cannot tell the difference. Use 85-95% for photos and you are fine.
Does Data URL keep transparency?
Data URL is only a text wrapper around the image data, so transparency depends on the image format inside it.
Are my files uploaded?
Never. Everything runs in your browser. Your files never leave your device. Open DevTools Network tab while processing — you will see no upload request.
Can I convert many files at once?
Yes, up to 20 files at once. Download them individually or all together as a ZIP.
Does the converter strip metadata?
Yes. Browsers do not pass EXIF data through a canvas, so GPS, camera model and dates are removed on every conversion. That is good for privacy.
Is it free?
Yes. No credits, no daily cap, no account, no watermark. The practical limit is your device memory.
When should I use data URLs?
For small images (under 10 KB) in single-file HTML, email templates, or CSS where an extra HTTP request would cost more than the encoding overhead. Never for photos or large icons.
Your files never leave your device
No upload, no account, no tracking. Everything happens in your browser using the Canvas API and WebAssembly. You can confirm this in your browser's DevTools Network tab while the tool runs — no request carries your file. See why ToolDeck is different.