BMP to JPG
BMP to JPG
Convert large BMP bitmap files to compressed JPG format
- Runs in your browser
- Nothing uploaded
- No sign-up
- Free, no daily limits
- 1Add your file
- 2Choose settings
- 3Download
Drop BMP files here
Choose a fileSelect one or more BMP images · up to 100 MB · nothing is uploaded
100% Private: All processing happens in your browser. Your files never leave your device.
Last updated
Bitmap (BMP) is the uncompressed raster image format introduced with early versions of Windows. Because BMP files record color information for every pixel without compression, high-resolution scans, Paint drawings, and diagnostic exports frequently weigh tens of megabytes, making them impossible to attach to emails or upload to web forms.
TryDocsy decodes your BMP files in local browser memory and recompresses them as standard JPEG images. All processing executes on your device via HTML5 canvas pipelines: your images never leave your machine. If you need lossless compression or need to preserve transparent layers, our BMP to PNG tool is a better option.
How it works
1. Add your BMP files
Drag your .bmp images onto the upload card or browse from your computer. You can upload large files up to 100 MB each.
2. Set your JPEG compression quality
Adjust the quality slider between 10% and 100%. The default 85% delivers a sharp image while dropping file size by more than 90%.
3. Convert and save your JPGs
Click the conversion button. Download your single converted JPG immediately, or save the complete queue as a ZIP package.
When you'd use it
Shrinking flatbed scanner exports for email
Older desktop scanners and legacy multi-function office printers often output uncompressed BMP scans by default. Converting to JPG reduces file weight so documents attach without exceeding mail server limits.
Submitting medical or lab imagery to online portals
Diagnostic devices, ultrasound machines, and industrial cameras frequently export raw bitmap stills. Converting to JPG satisfies strict portal upload limits that reject uncompressed formats.
Compressing full-resolution MS Paint graphics
Drawings and diagram screenshots saved through Microsoft Paint in BMP format consume substantial disk space. Converting to JPG makes them easy to share across messaging apps.
Overcoming legacy point-of-sale export limits
Retail inventory applications and older enterprise databases commonly store product photos as BMPs. Converting to JPG modernizes the files for mobile app catalogs.
How much disk space does converting BMP to JPG save?
Converting uncompressed BMP files to JPG typically reduces file size by 90% to 95%. Because uncompressed bitmaps allocate three full bytes per pixel (red, green, and blue) without entropy encoding, a high-resolution A4 document scanned at 300 DPI creates a 26 MB raw bitmap file that exceeds standard email attachment caps.
JPEG Discrete Cosine Transform compression groups pixels into frequency blocks and discards high-frequency variations that human vision cannot distinguish. This reduces heavy multi-megabyte bitmaps down to manageable files under 1 MB or 2 MB while preserving printed text legibility. If you need to hit an exact threshold for government forms, you can also run the output through our compress image tool.
| Specification | Windows BMP (DIB) | JPEG (JFIF) |
|---|---|---|
| Compression algorithm | Uncompressed raw pixels (or optional RLE) | Lossy Discrete Cosine Transform (DCT) |
| File size profile | Very large (uncompressed pixel matrix) | Compact (10:1 to 20:1 typical reduction) |
| Alpha transparency | Supported only in rare 32-bit RGBA BMPs | Not supported (opaque only) |
| Web browser support | Desktop browsers only, poor mobile support | Universal across every connected device |
| Maximum file capacity | Accepted up to 100 MB per file in tool | Exports optimized under 20 MB |
Source: Microsoft Windows Win32 GDI Bitmap Storage Documentation, checked October 29, 2026
What happens to transparency when converting a BMP to JPG?
While standard 24-bit BMPs contain no transparency, less common 32-bit BMP variants can store an alpha channel. Because the JPEG specification has no capability to store transparency, all transparent pixels are automatically painted with solid white (#ffffff) during conversion.
If your bitmap graphic is a transparent icon, logo cutout, or game asset that must retain its see-through background, do not convert it to JPG. Instead, use our BMP to PNG tool, which preserves full alpha channel information without flattening.
Why are non-BMP files skipped in the uploader?
The dedicated BMP converter inspects file MIME types and filename extensions upon selection. If you drag a mixed folder containing PNG or WebP files alongside your bitmaps, non-BMP files are filtered out to prevent conversion errors.
If you need to batch convert mixed folders containing multiple different image formats at the same time, open our Universal Image Converter. For multi-page document archives, explore our TIFF to JPG guide.
Frequently asked questions
Will transparent areas in my BMP survive conversion to JPG?
No. The JPEG specification cannot store alpha transparency. Any transparent areas in a 32-bit BMP are automatically filled with solid white during conversion.
What JPG quality setting should I choose?
The default 85% setting provides an ideal balance, reducing file size by roughly 95% while keeping photos and document scans sharp. Set it above 90% for high-detail archival scans.
What is the maximum BMP file size allowed?
The converter accepts BMP files up to 100 MB each. This higher limit accommodates large uncompressed scanner outputs and high-resolution Paint canvases.
Can I convert multiple BMP files simultaneously?
Yes. Drag multiple BMP files into the uploader. Each image is converted sequentially in local browser memory and can be downloaded as a ZIP file.
Why did some files in my upload folder not appear in the tool?
The tool pre-filters uploads to accept only image/bmp files and .bmp extensions. Non-BMP files are omitted to protect the conversion pipeline.
Are my uploaded bitmap files sent to external servers?
No. All image decoding, canvas composition, and JPEG encoding occur 100% inside your browser session without external transmission.