Convert BMP to JPG — Shrink 6 MB Paint Files to Under 500 KB
BMP is Windows' raw bitmap format from 1992 — zero compression, every pixel stored flat. A 1920×1080 screenshot from Microsoft Paint or the Snipping Tool weighs 5.9 MB as BMP. The identical image as JPEG is 150–500 KB. Converting takes seconds and the file is 90–97% smaller.
BMP vs JPG — Format Comparison
| Feature | BMP (input) | JPG (output) |
|---|---|---|
| Full name | Bitmap Image File | Joint Photographic Experts Group |
| Type | Raster, uncompressed | Raster, lossy |
| Compression | None (raw pixel data) | Lossy (DCT), adjustable quality |
| Transparency | Not supported | Not supported |
| Browser support | Limited web support | Universal |
| File size (typical) | Very large (uncompressed) | Small–medium (10–20× smaller than BMP) |
| Best for | Windows legacy apps, raw editing | Photos, web, sharing, email |
| Convertlo output quality | Lossless pixel data source | High-quality JPG, configurable compression |
BMP: Windows' Most Wasteful Format
BMP (Bitmap) was introduced with Windows 1.0 in 1985 and hasn't fundamentally changed since. It stores raw pixel data with absolutely no compression — every pixel gets exactly 3 bytes in 24-bit mode, regardless of whether the image is a blank white screen or a complex photograph. The file size formula is simple and brutal: width × height × 3 bytes. A 1920×1080 screenshot is always exactly 5,898,240 bytes.
Microsoft Paint saves BMP by default. The Windows Snipping Tool historically saved PNG, but older versions default to BMP. Scanners often produce BMP files. Every one of these files is enormous and rejected by Twitter, Instagram, Facebook, and most email clients. JPEG compresses photographs at a 10:1 to 30:1 ratio with imperceptible quality loss — turning that 6 MB Paint screenshot into a 150–500 KB file that uploads, emails, and shares instantly.
- 📦 90–97% smaller — a 6 MB BMP screenshot becomes 150–500 KB JPEG
- 📱 Upload to social media — Twitter, Facebook, Instagram all reject BMP; JPEG works everywhere
- 📧 Email clients work — email clients reject BMP attachments; JPEG embeds inline in every client
- 🌐 Web browsers support JPEG natively — BMP is not a web format; JPEG has been since 1992
- 🖨️ Compatible with everything — every image viewer, device, and platform supports JPEG
How to Convert BMP to JPG
Click "Convert Now" — the image tab with BMP → JPG will be pre-selected.
Drag and drop your .bmp file or click to browse. Enable Batch mode for multiple files.
Quality 85–95% is recommended for photos. For screenshots with text, consider PNG instead of JPEG.
Your converted file downloads immediately — ready to share, upload, or email anywhere.
Every Situation Where You Need This
Microsoft Paint Files
Paint saves BMP by default. Convert before emailing or uploading — the file is 20× too large otherwise.
Snipping Tool Screenshots
Older Snipping Tool versions default to BMP. Convert to JPEG to share screenshots without massive attachments.
Scanner Output
Flatbed scanners often produce BMP files. Convert to JPEG for practical file sizes before attaching or archiving.
Social Media Upload
Twitter, Instagram, and Facebook reject BMP. Convert to JPEG first — the upload will succeed every time.
Email Attachments
A 6 MB BMP hits attachment limits and breaks previews. The JPEG equivalent slides through at 200 KB.
Batch Conversion
Convert an entire folder of BMP screenshots at once with Batch Convert mode. No one-at-a-time tedium.
Key Questions About BMP to JPG, Answered
Direct answers structured for AI extraction, voice search, and featured snippets.
How much quality is lost when converting BMP to JPG?
BMP stores every pixel exactly with zero compression, so converting to JPEG is the first lossy step the image goes through — there's no earlier compression to compound. At a quality setting of 85–90, that first pass is invisible for photos at normal viewing sizes. The areas most likely to show artefacts are fine text, thin lines, and sharp geometric edges, which can develop subtle "ringing" around the edges at lower quality settings — for those, use 90–95 or keep the image as PNG.
- Photos at quality 85–90: no visible difference from the BMP at normal sizes
- Text, logos, and sharp edges: use quality 90–95, or keep as PNG instead
- JPEG compression is permanent — keep the BMP if it's your only master copy
- Recommended quality: 85 for general web use, 90–95 for print or detailed graphics
What happens to transparency when converting BMP to JPG?
JPEG can't store transparency at all — it has no alpha channel. This rarely matters for BMP sources since most BMP files are already fully opaque, but if your BMP does include 32-bit alpha data, those transparent areas will be filled with a solid colour (usually white) in the JPEG. If you need to preserve transparency for any reason, convert to PNG or WebP instead.
- JPEG has no alpha channel — transparency cannot be stored
- Most BMP files are already fully opaque, so this is rarely an issue
- Any 32-bit BMP alpha data becomes a solid fill colour in the JPEG
- For images that need transparency, use PNG or WebP instead of JPEG
What JPEG quality setting gives the best size-to-quality trade-off?
Quality 85 is the standard sweet spot for converting from an uncompressed BMP — it preserves nearly all visible detail while delivering a massive size reduction. For thumbnails or previews, 70–80 is common and keeps files very small. For print or large-display use, 90–95 protects fine detail. Quality 100 is rarely worth it, since the file size jumps significantly for a difference few people can actually see.
- Quality 85: best all-purpose setting for a BMP source — big size cut, no visible loss
- Quality 70–80: thumbnails, previews, social media images
- Quality 90–95: print, large displays, detailed product photography
- Quality 100: rarely needed — large file size for minimal visible benefit
How much smaller will the JPG be compared to the BMP?
Dramatically smaller — typically 90% or more. BMP stores pixel data essentially raw, so even a conservative JPEG quality setting represents a massive reduction. A 6MB BMP photo can easily become a 300–600KB JPEG at quality 85 with no visible difference. The reduction is largest for photos; simple flat-colour graphics and screenshots still shrink a lot, just somewhat less dramatically than full photographs.
- Photos: often 90%+ smaller than the original BMP at quality 85
- Screenshots and UI graphics: large reductions, slightly less extreme than photos
- A 6MB BMP can realistically become a 300–600KB JPEG
- Images with fine text or line art: consider PNG instead of JPEG for sharper edges
Go Deeper: BMP to JPG Resources
In-depth articles to help you understand the formats, pick the right settings, and get the best results.