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BMP to JPG converter

Convert BMP images to JPG format

No watermarkFree & unlimited
All processing happens in your browser. No data is sent to any server.

A bitmap that will not fit in an email, upload form or chat message is the usual reason for landing here, and JPG is the most direct cure: multi-megabyte files routinely drop below a hundred kilobytes. Because a 24-bit bitmap is opaque, this conversion has no transparency to discard, which makes it simpler than the same step from PNG. What you are giving up is exactness - JPEG approximates detail inside 8x8 blocks - so keep the bitmap if it is a master copy and treat the JPG as the distribution version.

Key facts about BMP to JPG converter

Key facts about BMP to JPG converter
Nature of the changeRaw uncompressed pixels are compressed for the first time, so this is a single lossy generation rather than a recompression.
Typical reduction95 to 99 percent. A 6.2 MB 1920x1080 bitmap usually lands between 100 KB and 300 KB at quality 90.
TransparencyNot an issue in this direction - a standard 24-bit bitmap is opaque, so the white fill applied before drawing never shows.
Quality slider30 to 100 with a default of 90, passed directly to the browser's JPEG encoder.
What suffersHard edges. Screenshots of text and UI chrome show ringing along the glyphs, which is where a lossless target is the better answer.
What benefitsPhotographs and scans, where the block transform is efficient and the artifacts hide inside the texture.
MetadataBitmaps store none, and none is created - the JPG has no EXIF block, no colour profile and no timestamps.
DecodingThe browser reads the bitmap; RLE-compressed or OS/2-style files may be rejected and reported as a load error.
Opens natively inEvery mail client, messaging app, phone gallery, web form and print service - JPG is the most portable image there is.

What happens to your file

The bitmap is decoded by your browser, drawn onto a canvas that is filled white first, and re-encoded through canvas.toBlob with image/jpeg at your chosen quality. That entire sequence runs in this tab on your own processor, so even a 200 MB bitmap is handled without a single byte being transmitted - which also means the conversion is limited by your machine's memory rather than by an upload allowance.

About this tool

  1. 1

    Drop in the bitmaps

    Up to twenty .bmp files per run, and a batch of large ones is exactly where this conversion pays off most.

  2. 2

    Pick a quality

    90 is a good default for photographs and scans. Text-heavy captures need 95 or more, or a different target format.

  3. 3

    Resize for the destination

    If the JPG is for an email or a chat thread, a preset such as 1920 or 1280 px will shrink it far more than the slider ever could.

  4. 4

    Convert and download

    Compare the reported before and after sizes, then save the .jpg or the ZIP if you converted several.

Specs & compatibility
Input and outputTakes .bmp only (image/bmp) and returns .jpg with the image/jpeg type; any other extension is refused before decoding.
Conversion pathBMP to JPG runs in three steps: an <img> element decodes the bitmap, 24-bit and 32-bit variants alike; the pixels land on a 2D canvas in this tab; then canvas.toBlob with the image/jpeg type returns the finished file.
Browser supportThe bitmap side decodes in every current browser, while writing the JPG is just as universal, since every canvas implementation encodes JPEG.
Controls for this pairA 30 to 100 quality slider (steps of five, default 90) drives the JPG encode, max-dimension presets from 3840 down to 200 px resize the BMP first, and the strip-metadata toggle is moot on this pair.
Batch, caps and namingTwenty BMP files per run at 500 MB each; one result downloads as a single JPG, several as converted-jpg-files.zip, zipped by JSZip 3.10 in page memory.
Device ceilingThe canvas caps it: past roughly 16,384 px a side Chromium refuses the bitmap and iPhone Safari gives up sooner, so an oversized BMP fails before any JPG bytes exist.
  • Keep the original bitmap if it is the only copy - JPEG's loss is permanent, and no later conversion restores the discarded detail.
  • For a screenshot of text, PNG is the better target: it shrinks the bitmap enormously without smearing the glyph edges.
  • Converting once and then re-saving the JPG repeatedly compounds the damage, so make edits on the bitmap and export a fresh JPG.
  • A scan of a photograph converts beautifully at quality 85, which is usually indistinguishable from 90 while noticeably smaller.
  • Making bitmap output from old software or a scanner small enough to email or upload.
  • Publishing legacy bitmap images on a website where a multi-megabyte asset would be unusable.
  • Getting a photograph out of a bitmap archive and into a phone gallery or a photo-book service.
Dramatically - typically a fiftieth to a hundredth of the bitmap. A 6.2 MB uncompressed file at 1920 by 1080 pixels usually converts to between 100 and 300 KB at quality 90. The bitmap's size is fixed by its dimensions alone, so the saving is enormous no matter what the image contains.
Yes, this is the step where lossy compression is applied for the first time. At quality 90 the loss is difficult to see on photographs and scans, but flat colour areas and sharp text show it more readily. Because the bitmap was pristine, the encoder has clean input to work with, which produces a better result than recompressing an existing JPEG.
Not in practice. The canvas is painted white before drawing because JPEG cannot store transparency, but a standard 24-bit bitmap has no transparent pixels, so the fill is completely covered. The behaviour only matters when converting from formats that do carry an alpha channel.
Consider PNG instead. JPEG's block transform creates halos around high-contrast edges, and text is nothing but high-contrast edges. PNG compresses screenshots losslessly and still reduces the bitmap by 80 to 95 percent, which makes it both smaller-looking and sharper for that content.
The browser decodes the ordinary 24-bit and 32-bit uncompressed forms, but RLE-compressed files, OS/2 headers and unusual bit-field layouts can be refused, which appears as a load failure rather than a silent problem. Re-saving the file as a plain 24-bit bitmap in Paint or GIMP resolves most cases.

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