How to Convert BMP to TIFF: Step-by-Step Tutorial

By Bill Crawford  ·  March 2026  ·  6 min read  ·  Last updated March 6, 2026

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What You'll Learn

This tutorial walks you through converting BMP images to TIFF format using the free browser-based converter at Data Conversion Center. You'll learn how to convert a single file, handle a batch of multiple BMPs, download as a ZIP, and understand what the conversion does and does not change about your images.

The entire process takes about 30 seconds for a typical file and requires no software installation, no account creation, and no file uploads to a server.

Before You Start

You need:

• One or more .bmp files on your computer
• A modern web browser (Chrome, Firefox, Safari, or Edge — all work)
• No other software, no plugins, no extensions

BMP files are natively decoded by browsers using the built-in createImageBitmap() API, which means the converter works even without an internet connection once the page has loaded.

Step 1: Open the Converter

Navigate to dataconversioncenter.com/image-tools/bmp-to-tiff/. You'll see the drop zone at the top of the tool — a dashed rectangle with "Drop BMP files here" and a Browse Files link.

The page loads two small JavaScript libraries in the background: UTIF.js (for TIFF encoding) and JSZip (for ZIP archive creation). Both are loaded from jsDelivr's CDN and are typically available within a second or two.

Step 2: Add Your BMP Files

You have two options for adding files:

• Drag and drop: Open a file manager window alongside the browser. Select one or more .bmp files and drag them directly onto the drop zone. The zone highlights in blue while you hover.
• Browse: Click anywhere in the drop zone (or the "Browse Files" link specifically). A standard file picker opens. Navigate to your BMP files, select one or more (hold Shift or Ctrl/Cmd for multiple), and click Open.

As soon as files are added, thumbnail previews generate automatically for each one. You'll see a grid of cards below the drop zone labeled "Input Files," each showing the filename, file size, and a "Ready" status badge. If any file isn't a valid BMP, a brief error notice appears and that file is skipped.

File limit: The converter handles 25 or more files at once. For very large batch jobs (100+ files), consider breaking them into smaller groups to keep browser memory usage manageable.

Step 3: Choose ZIP or Individual Download (Optional)

Below the drop zone, there's an options bar with a "Download as ZIP" checkbox. Here's when to use each option:

• Individual download (default, unchecked): After conversion, each output card has its own "⬇ Download TIFF" button. Use this for a single file or when you want to review each output separately before downloading.
• ZIP download (checked): All converted TIFFs are bundled into a single ZIP file named dataconversioncenter_bmp_to_tiff_YYYYMMDDHHMM.zip. Use this when converting multiple files that all need to go to the same destination folder.

You can change this setting at any time before or after conversion — even after you've clicked Convert, you can toggle the checkbox and then use the Download All TIFFs or Download ZIP button.

Step 4: Click Convert to TIFF

Click the blue "Convert to TIFF" button below the options bar. The tool processes files two at a time using Promise.all(), which keeps the browser responsive while maximizing throughput. You'll see:

• A progress bar and label showing "Converted X of Y…"
• Per-card status badges changing from "Ready" → "Converting…" → "Converted" (green) or "Error" (red)
• An "Output Files" section appearing as conversions complete, with downloadable TIFF cards

For a typical 2–5 MB BMP, conversion takes under one second. Larger files (10 MB+) may take 2–5 seconds depending on your device's performance.

Step 5: Download Your TIFF Files

Once conversion completes, a summary banner appears: "✓ All N files converted successfully." or a count of successes and failures if any files errored.

Download options:

• Individual files: Each card in the Output Files grid has a "⬇ Download TIFF" button. Click it to save that file.
• All at once (no ZIP): Click "Download All TIFFs" — the browser triggers sequential downloads for every converted file, each appearing in your downloads bar.
• ZIP archive: If "Download as ZIP" is checked, click "Download ZIP" to get a single archive containing all TIFFs.

After downloading, click "Start Over" to reset the tool and prepare for another batch.

Step 6: Verify Your Output

After downloading, open one of the TIFF files to verify the conversion. On macOS, Quick Look (spacebar in Finder) and Preview both open TIFF natively. On Windows, the Photos app and Paint open TIFF files. In Photoshop or GIMP, open the file and check Image → Image Size to confirm the dimensions match the source BMP exactly.

Since the conversion is lossless, pixel values should be identical between source BMP and output TIFF. If your workflow requires color-managed TIFF with embedded ICC profiles, you'll need to embed the profile using Photoshop, GIMP, or another color management-aware application after the initial conversion.

Troubleshooting Common Issues

File shows "Error" status

This typically means the BMP file is corrupted, uses an unusual variant of the BMP format (e.g., OS/2 BMP), or has a file extension mismatch. Try opening the file in Paint and re-saving it as BMP, then retry the conversion.

Thumbnail doesn't appear for some files

Very large BMPs (50 MB+) may take a few seconds to generate a thumbnail preview because the entire file must be decoded before a canvas preview can be drawn. The conversion itself will still work correctly.

Browser asks to allow multiple downloads

When downloading 3+ files without ZIP mode, Chrome and some other browsers prompt you to "Allow" multiple downloads from the site. Click Allow to proceed. This is a browser security feature, not a problem with the tool. Alternatively, use ZIP mode to avoid this prompt entirely.

Output TIFF is the same size as the source BMP

This is expected. The browser converter produces uncompressed TIFF, which has approximately the same size as an uncompressed BMP for the same pixel dimensions and bit depth. For LZW-compressed TIFF (smaller files), process the converted TIFF in Photoshop (File → Save As → TIFF → LZW) or GIMP (File → Export As → TIFF → LZW compression).