BMP to JPG Image Converter

What this page does

This page converts BMP images to JPG. The output opens on JPG, and you can add several bitmaps, set quality and optionally resize. The server writes a JPEG for each upload and returns a download.

It is a modernising step. BMP is a legacy bitmap that is often huge; JPEG is a compressed photo format that almost every device, portal and email client accepts. The output is smaller and easier to share, but it is lossy.

Why convert BMP to JPG

A BMP can be many times larger than the same image as JPEG. If you need to email a scan, upload a photo to a form or put an image in a document, JPEG is usually the practical choice. It is supported everywhere and keeps the file manageable.

JPEG is also a good delivery format for photographs. It handles smooth colour and tone well at moderate quality, and the size reduction is often dramatic compared with an uncompressed bitmap.

The cost is compression. Fine text, sharp line art and transparent edges may suffer. For those images, PNG is usually better.

File size reduction

A 3000 by 2000 BMP can be around 18 megabytes before headers. The same image as a high-quality JPEG may be a few megabytes or less. That difference is why BMP is rarely used for sharing.

The quality slider controls the trade-off. A lower setting makes a smaller file but can introduce blocking around edges. A higher setting preserves more detail but moves closer to the bitmap's size.

Resize before conversion if the destination does not need full dimensions. Sending a 3000-pixel photo to a form that displays 300 pixels wastes bandwidth and may exceed the upload limit.

Quality settings

The default is 75 percent, a reasonable starting point for photos. Raise it to 85 or 90 for detailed images or small text; lower it toward 60 when size is the priority.

Quality does not guarantee a specific KB value. A noisy image can stay large at a moderate setting, and a soft portrait can be small at a high setting. Check the actual file size after conversion.

Screenshots with text often look worse as JPEG than as PNG, even at high quality. Use PNG for sharp UI captures when the destination accepts it.

Colour and transparency

JPEG has no alpha channel. If the BMP has transparency, it must be flattened to a solid colour. The result may show a box around a logo or a hard edge around a cut-out subject.

Check the output on the final background. A logo designed for white can look wrong on a dark page. If transparency matters, keep the BMP or convert to PNG instead.

Colour profiles and metadata may not survive. If brand colours or a credit line matter, compare the result and add the information explicitly where needed.

Batch workflow

Add the files, keep JPG selected, set quality and any resize options, then process. Each card shows progress and a download. There is no ZIP bundle.

Test one photo, one screenshot and one image with transparency before converting a mixed folder. The best setting for a photo may soften text, and the best setting for a logo may produce a large file.

When not to use JPG

Do not use JPEG for line art, screenshots with text, logos with transparency or images that will be edited repeatedly. PNG is better for those. Do not use JPEG as an archive master either; keep the BMP or a PNG original.

Limits and privacy

Files are uploaded to the server for conversion. Do not send private documents to a public converter. The page does not offer a local-only mode.

Large bitmaps and long batches can hit upload or memory limits. Keep the BMP originals until the JPEGs have been checked, and do not assume EXIF data survives.

JPEG for scans and documents

A BMP scan can be enormous. Converting it to JPEG makes it practical to email or upload, but JPEG is not ideal for small text. Use a high quality setting and check that the words are still legible. For a document that will be read closely, PNG or a PDF may be the better handoff.

If the scan is black and white, JPEG may introduce grey halos around letters. A PNG or a bilevel format can stay sharper at a similar size.

Choosing quality by content

Portraits and landscapes tolerate a lower quality because the eye expects soft detail. Screenshots, charts and text need a higher setting or a different format. A batch with mixed content should be split by type rather than forced through one setting.

Check the actual bytes after conversion. A high quality setting on a noisy image can still produce a file that is too large for a portal, while a low setting on a simple graphic may be smaller than necessary.

Common conversion problems

A logo may lose its transparent background and show a solid box. A screenshot may develop coloured fringes around text. A photo may look blocky in smooth areas. These are JPEG trade-offs, not bugs; use PNG when they matter.

Keeping the original

JPEG is a delivery format, not a master. Keep the BMP or a PNG copy if you may need to edit or re-export the image later. Repeated JPEG saves add compression artifacts, and converting the JPEG back to BMP does not restore the lost detail.

Batch checks

After a batch, open the smallest and largest JPEGs. A very small file may be heavily compressed, and a very large one may exceed a portal limit. Check one image with fine text and one with a smooth gradient; those two reveal most quality problems.

If the JPEG is for a form, check the portal limits after conversion. The tool does not know the form limit, so you may need to resize or lower the quality again. Keep the BMP until the upload succeeds.

Name the JPEG with the destination and size in the file name. A folder full of files called photo.jpg is hard to audit when a form rejects one of them and you need to find the correct copy quickly.

Please always keep the BMP original on disk until the upload has succeeded, then archive it safely.

The 10 MB upload limit and large bitmaps

Each uploaded file can be up to 10 MB. That matters more for BMP than for any other input, because an uncompressed bitmap grows quickly with its pixel count. At three bytes per pixel, roughly 1800 by 1800 pixels is already near the limit, and the 3000 by 2000 scan mentioned above, at around 18 MB, would be rejected rather than converted.

If a bitmap is over the limit, reduce it before uploading. Save it at smaller pixel dimensions in an image editor, or export it from the scanner at a lower resolution. Re-saving the scan as PNG also works, since PNG compresses without losing detail. The converter's own resize fields cannot help here, because the size check happens before any processing.

Reading and using each result

When a card finishes, its output panel shows four badges:

• the new file size, with an arrow and percentage compared with the original BMP;
• the output width and height;
• the DPI, shown only when you entered one;
• the output format.

Click the small output thumbnail to open a larger preview, which is a quick way to spot blocking or fringes before saving. Download saves the JPEG. Copy Base64 copies the image as a data URI text string, which can be pasted into HTML, CSS or a JSON payload. A photo-sized JPEG makes a very long string, so use it for small images.

Each queued card has its own process and remove buttons. You can process one file on its own with the current settings, for example to test a quality level before running the rest, or drop a file from the list without clearing the whole batch.

Frequently Asked Questions