Image guides
How to Convert TIFF to BMP in Your Browser
TIFF is often the file format behind a scan, a multi-page fax, or an archival master copy, which makes converting it to BMP a slightly different question than it is for photo formats — page structure, not just pixels, is what's at stake. This guide covers what the conversion reads, what it leaves behind, and when BMP is actually the wrong target for a TIFF.
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How TIFF becomes BMP
- The decoder reads the TIFF's IFD — the directory structure describing how the pixel data is laid out — and decompresses whichever scheme the file used, none, LZW, or another supported method, into a raw pixel raster.
- Only the first IFD, meaning the first page, is read. If the TIFF is a multi-page document, a common output of scanners and fax software, every page after the first is left untouched in the source file and never reaches the output.
- If that first page carries an alpha channel, it's preserved through the decode step as a fourth value alongside red, green, and blue.
- The decoded pixels are then written into BMP's own uncompressed structure — alpha is dropped at this step, and no batching across pages occurs — as row-by-row 24-bit data.
What changes when you convert
This is technically a conversion between two formats that are both comfortable with uncompressed data, but it's still a lossy step in practice. TIFF's optional alpha channel doesn't survive — BMP flattens any transparency to white — and whatever compression scheme the source TIFF used, if any, is stripped in favor of BMP's no-compression row format. The BMP typically ends up the same size as an uncompressed TIFF, and noticeably larger than a compressed one.
The most consequential change is page handling. Scanned documents and multi-page faxes are frequently saved as a single TIFF containing dozens of pages, and converting to BMP captures only page one — page two onward is simply never read by the decoder. This isn't a suitable path for batch-converting a multi-page scan; each page needs to be split out first if you need all of them.
When BMP is the right choice — and when it isn't
BMP is a sensible target when a specific legacy Windows application or embedded print path calls for an uncompressed bitmap and won't accept TIFF — essentially the same use case TIFF itself often serves, just for an older piece of software.
For most TIFF users, though, the conversion is a downgrade rather than an upgrade: TIFF is usually the more capable archival format to begin with, keeping alpha and full page structure that BMP can't represent at all. If the source is a multi-page scan, look at extracting pages individually rather than accepting only page one. If transparency matters, staying with TIFF — or moving to ICO for an icon-shaped result — will do a better job than BMP.
Limitations and privacy
The single-page limitation is worth double-checking before you convert anything scanned — open the TIFF first if you're not sure how many pages it has, since there's no warning built into the download if pages beyond the first are silently skipped.
Conversion runs entirely in your browser; the TIFF file is never uploaded to Looty Tools servers as part of this process.
Convert TIFF to BMP FAQ
- What happens to the other pages when I convert a multi-page TIFF to BMP?
- Nothing — they're left out entirely. Only the first page (the first IFD) is decoded and converted; pages after that are never read by the converter.
- Is the BMP always bigger than the original TIFF?
- Not always. If the source TIFF was already uncompressed, the BMP will be roughly the same size. If the TIFF used a compression scheme like LZW, the BMP will typically be noticeably larger, since BMP applies no compression at all.
- Does the BMP keep the TIFF's transparency?
- No. Even though the alpha channel is read during decoding, BMP output has no alpha channel to write it to, so transparent areas are flattened onto white.
- How do I convert every page of a multi-page TIFF, not just the first?
- This converter only ever processes the first page. To get the other pages, you'd need to split the multi-page TIFF into individual pages first, then convert each one separately.
- Is my TIFF file uploaded anywhere during conversion?
- No. Conversion happens locally in your browser and the file is never sent to Looty Tools servers.
Related guides
- TIFF vs JPGCompare TIFF and JPG for lossless quality, file size, software compatibility, and when converting TIFF to JPG is the better choice.
- Convert Images Without UploadingLearn what browser-local image conversion means on Looty Tools, what stays on your device, and how Image Converter avoids a conversion upload.
