BMP to TIFF Converter
Convert BMP to TIFF in your browser. BMP files usually come from Windows Paint, legacy Windows programs, embedded displays and some scanners; TIFF is the better fit for printing, scanning and archival masters. You get an uncompressed 8-bit RGBA TIFF with the resolution recorded. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
BMP expected · other image formats also work
How to use BMP to TIFF
- 1
Add your BMP files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the TIFF is written uncompressed. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .tiff files one at a time or together as a ZIP.
Why use Aback Images for bmp to tiff
Where the TIFF goes next
TIFF opens in Photoshop, Lightroom, GIMP, Affinity, macOS Preview, Windows Photos and print RIPs.
TIFF next to BMP
The TIFF is written uncompressed, so expect it to be several times larger than the BMP, which stores usually none; RLE for some 4 and 8-bit files.
Written without a lossy pass
The TIFF is written uncompressed, so the pixels decoded from the BMP arrive unchanged.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
BMP vs TIFF
What changes from BMP to TIFF
Encoding: the BMP uses usually none; RLE for some 4 and 8-bit files; TIFF uses none, LZW, PackBits, Deflate or JPEG, chosen per file, and the download is an uncompressed 8-bit RGBA TIFF with the resolution recorded.
Bit depth: 1, 4, 8, 16, 24 or 32 bits per pixel in the BMP; TIFF allows 1 to 16 bits per channel, or 32-bit floating point, and the TIFF written here has 8 bits per channel.
Colour: RGB or an indexed palette in the BMP; TIFF supports RGB, CMYK, Lab, greyscale or palette, often with an ICC profile, written here as 8-bit sRGB.
Transparency: the BMP stores it as an optional fourth byte in 32-bit files, which many programs ignore; the TIFF keeps it as an extra sample declared in the ExtraSamples tag.
Metadata: the BMP can carry nothing beyond the header's resolution fields (and a colour profile in rare V5 headers); TIFF can carry EXIF, XMP, IPTC and ICC, all stored as tags, but nothing is copied across.
About BMP
BMP stores raw, uncompressed pixels. Files are huge but trivially simple, which is why some legacy Windows software, embedded displays and printers still ask for it.
A BMP is a 14-byte file header ('BM' and the offset to the pixels), a DIB header (40 bytes, or 108 and 124 bytes in the V4 and V5 versions that add colour masks and alpha), an optional palette, then pixel rows padded to 4 bytes and normally stored bottom-up.
BMP files usually come from Windows Paint, legacy Windows programs, embedded displays and some scanners.
About TIFF
TIFF is the professional archive and print format. It can hold multiple pages, high bit depths and lossless data, and is common in scanning, publishing and GIS.
A TIFF begins with 'II' or 'MM' for the byte order and the number 42, then an offset to the first image file directory (IFD): a table of tags giving the size, compression, colour model and the location of the strips or tiles of pixels. Each further page is another IFD.
When converting BMP to TIFF makes sense
TIFF is the better choice for printing, scanning and archival masters, while BMP suits legacy software and embedded systems that require it.
TIFF strengths: Lossless and print-ready; Multiple pages in one file; Preferred by print shops and archives. Drawbacks to weigh: Very large files; Browsers cannot display it; Many variants and compression schemes.
Limitations
- BMP stores nearly every pixel literally, so almost any compressed target is several times smaller.
- A 32-bit BMP can carry an alpha byte that most programs ignore; if the image suddenly gains transparent areas after converting, that byte was set.
- The TIFF is written uncompressed for maximum compatibility, so it is large; print shops and archives generally expect that.
- Browsers other than Safari do not display TIFF, so it is not a format for the web.
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Frequently asked questions
Does converting BMP to TIFF lose quality?
TIFF is written uncompressed, so the pixels are stored exactly as decoded.
Is transparency kept in the TIFF?
Yes. BMP stores it as an optional fourth byte in 32-bit files, which many programs ignore, and the TIFF is written with an alpha channel, so transparent areas stay transparent.
Which apps open TIFF files?
Photoshop, Lightroom, GIMP, Affinity, macOS Preview, Windows Photos and print RIPs. It opens in Safari only; other browsers do not display TIFF.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.