Which is better, BMP or JPEG?

JPEG is better for photographs, web images, and anything you need to share or email — it is 10–30× smaller than BMP for photos. BMP is better when you need pixel-perfect lossless storage on Windows and don't care about file size. For web and sharing, JPEG wins decisively. For lossless archiving, PNG is better than both — it's lossless like BMP but 5–15× smaller.

What is the file size difference between BMP and JPEG?

Dramatic. A 1920×1080 24-bit BMP is always exactly 5.93 MB. The same photograph as JPEG at quality 85 is typically 200–600 KB — roughly 10–30× smaller. At quality 95 (near-lossless JPEG), it's about 1–2 MB, still 3–6× smaller than BMP.

Does converting BMP to JPEG lose quality?

Yes. JPEG uses lossy compression, so converting BMP to JPEG permanently discards some image detail. At quality 85, the difference is invisible to most people for photographs. At quality 60, compression artifacts (blocky patterns, color banding) become visible. For logos, screenshots, and flat-color graphics, even small quality loss is noticeable — use PNG instead of JPEG for those.

Can BMP and JPEG both be transparent?

No — neither standard BMP (24-bit) nor JPEG supports transparency. JPEG has no alpha channel at all. Standard BMP 24-bit has no transparency; 32-bit BMP technically has an alpha channel but software support is inconsistent. For transparency, use PNG or WebP instead.

Format Comparison

BMP vs JPEG — What's the Difference? File Size, Quality & When to Convert

May 30, 2026 · 8 min read · Convertlo Team ·Last updated: Jun 4, 2026

Is BMP the same as JPEG? No — they are fundamentally different formats. BMP stores every pixel raw, with no compression. A 1920×1080 BMP is always exactly 5.93 MB. JPEG uses lossy compression — the same photograph as JPEG at 85% quality is typically 200–500 KB, roughly 10–30× smaller. BMP never loses quality; JPEG permanently discards some detail. For sharing photos or web use, JPEG wins. For pixel-perfect screenshots or lossless archiving, use PNG instead of both — it's lossless like BMP but 5–15× smaller.

At a Glance: BMP vs JPEG

Property	BMP	JPEG
Compression	None (raw pixels)	Lossy (DCT)
1920×1080 file size	Always 5.93 MB	200–600 KB (Q85)
Quality loss	None — pixel perfect	Yes — permanent
Transparency	No (24-bit)	No
Metadata / EXIF	None	Full EXIF, GPS, camera
Browser support	Slow, poor	Universal, fast
Email / sharing	Too large	Ideal
Best for	Legacy Windows apps	Photos, web, sharing

File Size: The Most Obvious Difference

The file size gap between BMP and JPEG is enormous in practice. BMP size is fixed by resolution and color depth — image content doesn't matter at all. JPEG size depends on content complexity and the quality setting you choose.

Resolution	BMP (24-bit)	JPEG Q95	JPEG Q85	JPEG Q75
640×480	900 KB	150–350 KB	60–150 KB	40–100 KB
1280×720	2.64 MB	400 KB–1 MB	150–400 KB	100–250 KB
1920×1080	5.93 MB	800 KB–2 MB	200–600 KB	150–400 KB
3840×2160 (4K)	23.7 MB	3–7 MB	800 KB–2.5 MB	500 KB–1.5 MB

The JPEG ranges depend on image complexity — photographs with lots of detail, texture, and color variation compress less efficiently than simple or flat images. A BMP's size is always exact; there's no range.

Quality: How JPEG Compression Works

BMP compression is simple to explain: there is none. Every pixel's RGB value is stored exactly as 3 bytes. What you see is what's stored, with no processing or transformation.

JPEG uses a completely different approach called Discrete Cosine Transform (DCT). The algorithm:

Divides the image into 8×8 pixel blocks
Converts each block from RGB to a frequency representation
Discards high-frequency detail (fine texture, sharp edges) — the amount discarded is controlled by the quality setting
Entropy-encodes the remaining data using Huffman coding

The detail that's discarded is gone permanently. Every time you save as JPEG — even back to the same file — additional detail is lost. BMP has no such limitation: save and re-save as many times as you need with zero quality change.

The visible result of JPEG compression at low quality settings is "blocking" — blocky patterns at 8×8 pixel boundaries — and "ringing" — halo artifacts around sharp edges like text or fine lines. At quality 85+, these artifacts are invisible to most people in photographs. On flat-color graphics, text screenshots, and pixel art, they are often visible even at high quality settings.

Transparency: Neither Supports It Well

Standard 24-bit BMP files have no alpha channel — no transparency support. 32-bit BMP technically includes an alpha byte, but support is inconsistent across applications. Many programs that open BMP files simply ignore the alpha channel. This makes 32-bit BMP transparency unreliable in practice.

JPEG has no transparency support at all — not in any mode. When you save a transparent image as JPEG, the transparent areas are filled with a background color (typically white).

If you need transparency: use PNG (lossless, universal alpha support) or WebP (smaller than PNG, full alpha, modern browser support).

Metadata: JPEG Wins Decisively

JPEG supports comprehensive metadata through the EXIF standard — camera model, lens, exposure settings, GPS coordinates, date/time, color profiles, copyright information, and more. This metadata is embedded in the file and travels with it. Every modern camera and smartphone writes EXIF data to JPEG files automatically.

BMP has no EXIF support. The format has minimal metadata capability — only the DIB header fields (width, height, bit depth, resolution in pixels/meter). No camera information, no location, no color profiles. If you convert a JPEG with rich EXIF data to BMP, all that metadata is lost.

When BMP Beats JPEG

JPEG's lossy compression is not always acceptable. BMP remains the better choice in these specific scenarios:

Use BMP when:

Working in a Windows legacy application that only saves BMP
Editing in an intermediate step (save lossless, export JPEG at the end)
Processing images programmatically where BMP's simple structure makes direct pixel access easier
The receiving software only supports BMP (rare but some CAD and industrial tools)

Use JPEG instead for:

Photographs — JPEG is the industry standard for photos
Email attachments and messaging
Web images (photos, hero images, blog images)
Social media uploads
Print services — most labs prefer JPEG
Any situation where file size matters

For screenshots and text-heavy images: use PNG, not JPEG. JPEG artifacts make text look blurry and pixelated. PNG is lossless (like BMP) but typically 5–15× smaller, and has universal web support. JPEG's artifacts are forgivable on photographs but unacceptable on sharp UI and text content.

How to Convert BMP to JPEG

There are several ways to convert BMP to JPEG, from no-install browser tools to command-line options:

Browser (fastest, no install): Convertlo BMP to JPEG converter — free, no upload, runs in your browser.
Windows Paint: Open the BMP → File → Save As → JPEG. Set quality with the slider.
Mac Preview: Open the BMP → File → Export → JPEG. Adjust quality with the slider.
GIMP: File → Export As → type .jpg → choose quality.
Command line: convert input.bmp -quality 85 output.jpg (ImageMagick)

For the full step-by-step guide for all methods including batch conversion, see our BMP to JPG Guide.

Convert BMP to JPEG — Free, No Upload

Runs in your browser. Choose quality, convert instantly. No signup required.

Convert BMP to JPEG → BMP to PNG (lossless)

Frequently Asked Questions

Is BMP the same as JPEG?

No. BMP stores pixels raw with no compression — a 1920×1080 BMP is always 5.93 MB. JPEG uses lossy compression — the same image is 200–500 KB. BMP is pixel-perfect and never degrades; JPEG permanently discards some detail each time you save. They serve completely different purposes.

Which has better quality, BMP or JPEG?

BMP has higher quality in the sense that it's lossless — no detail is ever discarded. But "better quality" depends on use case. For photographs on websites or in email, JPEG at quality 85–90 is visually indistinguishable from the source and 10–15× smaller. For pixel art, screenshots, or images with text where any artifact is visible, lossless PNG is better than both BMP and JPEG.

Can you tell the difference between BMP and JPEG visually?

For photographs at JPEG quality 85+, most people cannot detect a difference in normal viewing. At JPEG quality below 75, blocky 8×8 pixel artifacts become visible. On flat-color images, logos, screenshots, and text, JPEG artifacts are often visible even at high quality — these image types should always use PNG or BMP (or ideally PNG to get lossless without the size penalty).

Does JPEG lose quality every time you save?

Yes. Each JPEG save re-runs the lossy compression and discards additional detail. Saving the same file 10 times produces visible degradation. BMP, PNG, and TIFF are lossless and do not degrade on re-save. For this reason, keep the original lossless file (BMP or PNG) as your master and export JPEG only for the final output.

Should I convert my BMP photos to JPEG?

Yes, for sharing, emailing, or uploading to websites. JPEG is 10–30× smaller than BMP for photographs with barely visible quality difference at quality 85. But consider PNG as well — it's lossless like BMP, universally supported, and 5–15× smaller than BMP. PNG is the better "archive" format; JPEG is the better "sharing" format.

How do I convert BMP to JPEG for free?

Use Convertlo's free converter — no upload, no account, runs in your browser. Windows Paint also does it: open the BMP, File → Save As → JPEG. Mac Preview: open BMP → File → Export → JPEG. For batch conversion of many files, see the full BMP to JPG guide.