JPG to ICO Converter: Free, Private, No Upload
Convert JPG files to ICO in your browser. Lossless output, batch up to 20 files at once, no upload, no account, no watermark. Your files never leave your device.
- JPG to ICO
- 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 JPG to ICO for free?
Drop your JPG files into the tool above, choose ICO 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
- JPG
- Output format
- ICO
- Best for
- ICO workflows, lossless quality, editing, printing
- Works on
- Chrome, Edge, Firefox, Safari, iOS and Android browsers
- Privacy
- No upload, no tracking, metadata stripped
- Output quality
- Lossless, exact pixels
How to convert JPG to ICO
- 1
Drop your JPG files
Drag up to 20 JPG files onto the page or click to choose them. Everything runs in your browser.
- 2
ICO is preselected
Output is already set to ICO. Adjust quality, resize or batch if you want.
- 3
Download
Save each ICO, or download all of them together as a ZIP.
JPG to ICO: what changes and when it makes sense
JPG is a Joint Photographic Experts Group format. It is best known for small files for photographs and near-universal compatibility. The main drawbacks are no transparency, visible blocking at low quality, and quality that drops every re-save.
ICO is an Windows icon format. It is best known for packing several sizes (16, 32, 48, 256 pixels) into a single file. The main drawbacks are a maximum size of 256 by 256 pixels and little use outside icons.
JPG vs ICO at a glance
| Property | JPG | ICO |
|---|---|---|
| Type | Raster image | Container format |
| Compression | Lossy (DCT based, with chroma subsampling) | A container holding one or more bitmaps, each stored as BMP or PNG data |
| Transparency | None | Full alpha channel with soft edges |
| Animation | No | No |
| Colour depth | 8 bits per channel (24-bit colour) | Up to 32-bit colour with an 8-bit alpha channel |
| Support | Opens in every browser, operating system, camera, editor and print service | Supported by Windows and by browsers as a favicon, but most image viewers and editors do not open it directly |
| History | Created in 1992 by the Joint Photographic Experts Group and standardised as ISO/IEC 10918. It became the default image format of the early web because it offered photographic compression when storage was expensive. Still the most widely used photo format 30+ years later. | Introduced by Microsoft with Windows 1.0 in 1985. The modern 32-bit alpha version became standard with Windows XP (2001). Windows Vista (2007) added PNG compression inside ICO for icons larger than 48x48. |
What actually changes in this conversion
- Moving from a lossy format to a lossless one stops any further quality loss but cannot restore detail already discarded.
- JPG has no alpha channel, so every pixel is already opaque.
- ICO holds images up to 256 by 256 pixels. Larger sources are scaled down.
- EXIF, GPS and camera data are stripped on every conversion. That is good for privacy, but you lose capture dates.
About JPG: history and technical details
Created in 1992 by the Joint Photographic Experts Group and standardised as ISO/IEC 10918. It became the default image format of the early web because it offered photographic compression when storage was expensive. Still the most widely used photo format 30+ years later.
Technical: 8x8 block Discrete Cosine Transform with 4:2:0 chroma subsampling by default. Baseline supports 8-bit per channel. Progressive loads in waves. Maximum dimensions 65,535 by 65,535 pixels. Maximum 16.7 million colours.
Real-world size: A 12-megapixel photo at quality 85 is typically 2-4 MB. The same photo as PNG is 18-25 MB, as BMP is 36 MB. JPG is 60-80% smaller than PNG for photographs.
Popular tools: Adobe Photoshop, GIMP, Affinity Photo, Lightroom, macOS Preview, Windows Photos, ImageMagick, FFmpeg.
Alternatives: WebP (25-35% smaller), AVIF (30-50% smaller), HEIC (50% smaller, Apple only), PNG (lossless, 5-10x larger).
About ICO: what you get
Introduced by Microsoft with Windows 1.0 in 1985. The modern 32-bit alpha version became standard with Windows XP (2001). Windows Vista (2007) added PNG compression inside ICO for icons larger than 48x48.
Technical: Container holds 1-65535 images. Each entry has a 16-byte directory: width, height, colour count, planes, bit count, data size, data offset. Images are BMP (DIB) or PNG. Max dimension 256x256. Typical Windows icons use 16, 32, 48, 64, 128, 256.
Real-world size: A 6-size favicon.ico is typically 15-40 KB. A single 256x256 PNG favicon is 8-15 KB. Modern best practice uses separate files for 16, 32, 180 (Apple), 192, 512 (PWA).
Popular tools: IcoFX, GIMP, Adobe Photoshop (with plugin), ImageMagick, Favicon Generator, RealFaviconGenerator.
Alternatives: PNG (single size, widely accepted), SVG (sharp at any size), favicon.ico (still needed for legacy).
Browser and software compatibility
JPG: Opens in every browser, operating system, camera, editor and print service. ICO: Supported by Windows and by browsers as a favicon, but most image viewers and editors do not open it directly.
ICO is meant for favicons and Windows icons. It is not a general-purpose image format.
Why people move away from JPG
- JPG cannot store transparency, so logos, cut-outs and interface assets need another format.
- Every re-save of a JPG throws away more detail, a problem for images edited repeatedly.
- Sharp edges and text show ringing artefacts in JPG, and newer codecs give smaller files at the same visual quality.
Why people choose ICO
- Browsers and Windows still look for favicon.ico at the root of a site by default.
- One ICO file can carry several sizes, so tab icons, bookmarks and shortcuts all look sharp.
- Windows shortcuts and application icons expect ICO.
Common mistakes with JPG
- Re-saving a JPG multiple times compounds quality loss — always keep the original
- Using JPG for logos with text causes visible ringing around letters
- Setting quality above 95 rarely improves visual quality but enlarges files
Best practices for keeping quality
- If you still have the original camera file, convert from that. A JPG already compressed hard has little detail left to preserve.
- Start from a square image of at least 256 by 256 pixels and keep the design simple, since it will often be shown at 16 by 16.
- Keep a PNG or SVG copy. Modern browsers accept link rel="icon" pointing at PNG or SVG.
- 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.
JPG to ICO questions
Quick answers about privacy, quality, supported formats, file limits and how ICO works.
Why convert JPG to ICO?
ICO is lossless. It keeps every pixel exactly. It is the safe choice when you plan to edit, print or need exact pixel data.
Will converting JPG to ICO lose quality?
No. ICO is lossless, so nothing is thrown away.
Does ICO keep transparency?
Yes. ICO supports full transparency, so transparent areas in your original are kept.
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.
What sizes should a favicon.ico have?
At minimum 16x16, 32x32, and 48x48. Modern best practice is to include 16, 32, 48, 64, 128, and 256 pixel versions in one ICO file. Browsers pick the size they need.
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.