JPG to BMP Converter: Free, Private, No Upload
Convert JPG files to BMP 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 BMP
- 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 BMP for free?
Drop your JPG files into the tool above, choose BMP 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
- BMP
- Best for
- BMP 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 BMP
- 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
BMP is preselected
Output is already set to BMP. Adjust quality, resize or batch if you want.
- 3
Download
Save each BMP, or download all of them together as a ZIP.
JPG to BMP: 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.
BMP is a Bitmap image format. It is best known for a simple structure that legacy programs and embedded systems can read without a decoder library. The main drawbacks are enormous files and no reliable transparency.
JPG vs BMP at a glance
| Property | JPG | BMP |
|---|---|---|
| Type | Raster image | Raster image |
| Compression | Lossy (DCT based, with chroma subsampling) | Usually uncompressed (run-length encoding exists but is rare) |
| Transparency | None | None |
| Animation | No | No |
| Colour depth | 8 bits per channel (24-bit colour) | 1 to 32 bits per pixel |
| Support | Opens in every browser, operating system, camera, editor and print service | Opens in browsers and most desktop software, but almost never used on the web |
| 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. | Created by Microsoft for Windows 1.0 in 1985 as the native bitmap format for the Windows Graphics Device Interface. The "BM" signature has been unchanged since then. Still used in embedded systems and legacy Windows software. |
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.
- Expect the BMP file to be far larger than the JPG source.
- 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 BMP: what you get
Created by Microsoft for Windows 1.0 in 1985 as the native bitmap format for the Windows Graphics Device Interface. The "BM" signature has been unchanged since then. Still used in embedded systems and legacy Windows software.
Technical: File header 14 bytes (signature, size, reserved, offset) followed by DIB header (40+ bytes). Supports 1, 4, 8, 16, 24, 32-bit pixels. Rows padded to 4-byte boundaries. Pixels can be stored bottom-up or top-down. Optional RLE4/RLE8 rarely used.
Real-world size: A 12-megapixel photo is 36 MB as 24-bit BMP. As JPG it is 2-4 MB (90% smaller). A 1920x1080 screen at 32-bit BMP is 8.3 MB; as PNG 200-600 KB.
Popular tools: Windows Paint, IrfanView, XnView, ImageMagick, GIMP, Adobe Photoshop, embedded dev tools.
Alternatives: PNG (lossless, 5-20x smaller), TGA (game pipelines), TIFF (professional print), JPG (lossy, much smaller).
Browser and software compatibility
JPG: Opens in every browser, operating system, camera, editor and print service. BMP: Opens in browsers and most desktop software, but almost never used on the web.
BMP output opens in browsers and most desktop software, but very few web workflows expect it.
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 BMP
- Some legacy Windows software, embedded displays and industrial tools only read BMP.
- With no compression there is no decoding step and no compression artefacts.
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.
- Expect a very large file. Check the upload limit and free disk space before saving.
- Flatten any transparency first. BMP does not reliably carry an alpha channel.
- 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 BMP questions
Quick answers about privacy, quality, supported formats, file limits and how BMP works.
Why convert JPG to BMP?
BMP 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 BMP lose quality?
No. BMP is lossless, so nothing is thrown away.
Does BMP keep transparency?
No. BMP does not support transparency. Transparent areas will be filled with white.
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.
Why is BMP so large?
Because it stores raw pixel data with little or no compression. A 12-MP photo as 24-bit BMP is 36 MB, compared to 2-4 MB as JPG. The tradeoff is speed (no decoding needed) and lossless quality.
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.