Drag & drop your .bmp files here — convert many at once — or click to choose
What is BMP, and why convert it?
BMP (Bitmap) is one of the oldest image formats on Windows, introduced with the very first versions of the operating system. Its defining trait is that it stores pixels raw and uncompressed — every single dot in the image is written out byte by byte, with no attempt to pack the data down. That makes BMP simple and perfectly faithful, but it also makes the files enormous: a full-screen photo saved as BMP can easily run to 20–30 MB, many times the size of the same image as JPG. You still bump into BMP today in output from old scanners, industrial and medical software, classic Windows Paint, and exported screen captures. Because so few websites, phones and email clients deal gracefully with such heavy files, converting BMP to JPG is usually the quickest way to make those images practical to move around.
Why convert BMP to JPG?
JPG was designed for exactly the problem BMP creates — it compresses photographic detail aggressively while keeping the result visually close to the original. Switching from BMP to JPG buys you:
- Massive size savings: a multi-megabyte bitmap typically shrinks by 90% or more, so a folder of scans goes from gigabytes to a handful of megabytes.
- Universal compatibility: every phone, browser, email client and web form accepts JPG, whereas large BMPs are often rejected or refuse to preview.
- Faster sharing and uploads: smaller files mean quicker transfers, less storage and no hitting attachment limits.
- Easy archiving: keeping old bitmap libraries as JPG reclaims a huge amount of disk space without a visible drop in quality.
If the image is a diagram, logo or screenshot with crisp text rather than a photo, consider BMP to PNG instead — PNG keeps sharp edges perfectly while still shrinking the file.
BMP vs JPG
| Format | Compression | Typical file size | Transparency | Best for |
|---|---|---|---|---|
| BMP | None (raw pixels) | Very large | Rarely used | Legacy Windows apps, raw capture |
| JPG | Lossy | Small | No | Photos, sharing, uploads |
How to batch convert BMP to JPG
- Drag your .bmp bitmaps into the box above, or click it to select a whole folder at once.
- Set the quality slider — 85–90% keeps photos looking identical while still cutting the size dramatically.
- Download each JPG individually, or click Download all to grab the whole batch as one ZIP. Your files never leave your device.
Common jobs this tool helps finish
- Taming scanner output that saved pages or photos as oversized BMP files.
- Rescuing old project folders full of bitmaps so they fit in cloud storage.
- Emailing a screenshot that an app exported as BMP and is too big to attach.
- Preparing legacy images for a website so pages aren't weighed down by raw bitmaps.
Is it private?
Yes. Every bitmap is decoded and re-saved right inside your browser, so your images are never uploaded to a server and never stored by us. Many online converters send your files to a remote machine to process them — this one doesn't, which matters when the bitmaps are scans of documents or personal photos.
Related converters
Want lossless output with sharp edges instead? Use BMP to PNG. Already working with other formats? Try PNG to JPG to shrink graphics, or JPG to PNG for a lossless working copy.
Frequently asked questions
How much smaller will the JPG be than the BMP?
It's common to see a photographic BMP drop by 90% or more. A 25 MB uncompressed bitmap can become a one- or two-megabyte JPG at high quality, because JPG discards detail the eye barely notices while BMP stores every pixel raw.
Will I lose quality converting BMP to JPG?
JPG is lossy, so some data is discarded, but at 85–95% quality the difference is invisible for photographs. For screenshots, diagrams or images with sharp text and flat colour, BMP to PNG keeps cleaner edges.
Why does BMP still appear on Windows machines?
BMP is a native Windows bitmap format dating back to the early 1990s, so it's still produced by some scanners, legacy business apps and the classic Paint Save As menu. Converting to JPG makes those files practical to email and upload.
Can I batch convert a folder of BMP files?
Yes. Add as many BMP files as you like, convert them in one batch, and download them all as a ZIP. Large uncompressed bitmaps use a lot of memory, so very big batches run best on a desktop.
Are my images uploaded to a server?
No. Conversion runs entirely in your browser, so your bitmaps never leave your device and are never stored by us.