PDF to BMP

Q: What is BMP and why are BMP files so large?

BMP, or Bitmap, is a raster image format developed by Microsoft that stores every pixel as a direct color value with no compression applied. In a typical 24-bit BMP file, each pixel uses 3 bytes of storage, one byte each for red, green, and blue. File size is therefore determined directly by width multiplied by height multiplied by 3 bytes. Because BMP does not use compression to remove redundant patterns, even large areas of identical color take just as much space as detailed areas. This is why BMP files are much larger than PNG or JPG for the same image content.

Q: Why would I need BMP instead of PNG or JPG?

For most use cases, you would not need BMP. PNG provides the same lossless image quality at much smaller file sizes, and JPG offers even smaller files for photographic content. BMP is mainly useful when a specific system requires it, such as certain legacy Windows applications, some embedded systems or microcontrollers that read raw pixel data directly, specific Windows wallpaper or kiosk configurations, or technical tools that expect uncompressed bitmap input. If your application can accept PNG, PNG is usually the better choice.

Q: Will the BMP look exactly like the PDF page?

Yes. The BMP is a pixel-accurate visual rendering of the PDF page at the selected resolution. Text, fonts, images, colors, backgrounds, and layout appear exactly as they do in the PDF. Because BMP applies no compression, no image quality is lost after rendering. The final sharpness depends on the chosen DPI and on the quality of the source PDF. Vector PDFs render sharply at any DPI, while scanned PDFs can only look as sharp as the original scan allows.

Q: Can I convert BMP back to PDF?

Yes. You can use the ToolsPiNG BMP to PDF converter to combine BMP images into a PDF document. This is the reverse of the PDF to BMP process. However, once a PDF has been turned into BMP images, the original vector content is no longer preserved. Converting those BMP files back into PDF creates an image-based PDF rather than restoring selectable text or original vector elements.

Q: Is BMP supported on macOS and Linux?

BMP can be opened on macOS and Linux, but support is less common and less convenient than on Windows. macOS Preview can open BMP files, and many Linux image viewers such as GIMP and standard desktop viewers can handle them as well. However, BMP is not a common web format, is not widely supported in browsers, and is less convenient than PNG or TIFF for most non-Windows workflows. If the recipient or workflow does not specifically require BMP, PNG is usually the better choice.

Convert PDF to BMP images in seconds. Upload your PDF and export each page as a clean, high-resolution BMP—great for technical docs, printing workflows, and archiving. No watermark, no software, works on any device.

PDF to BMP Converter

The PDF to BMP Converter renders each page of a PDF document as a BMP (Bitmap) image file. Upload your PDF, click Convert to BMP, and download one BMP per page — each a complete, uncompressed pixel-accurate image of that PDF page. BMP stores every pixel at full color depth without any compression algorithm, making it the format of choice when raw, unprocessed pixel data is required by a specific system or application.

PDF to BMP conversion is used when a target system, legacy application, or technical workflow specifically requires BMP input. For most other use cases — sharing, web use, archiving, printing — PNG produces identical lossless quality at 70–88% smaller file sizes with universally broader compatibility. If your use case does not specifically require BMP, PDF to PNG is almost always the more practical choice.

How to use the PDF to BMP Converter

Click Select a File or drag and drop your PDF into the upload area. Guest users can upload up to 5 files (10 MB each); registered users up to 20 files (40 MB each).
Click Convert to BMP. The tool renders each PDF page and produces an uncompressed BMP image file for every page.
Download the BMP files. Each PDF page produces a separate BMP image, typically packaged in a ZIP archive for multi-page PDFs.
Verify the output in your target application. Open the BMP in your intended software and confirm the image quality, dimensions, and color rendering meet your requirements.
Be prepared for large file sizes. BMP files are significantly larger than PNG or JPG for the same content. An A4 page at 300 DPI produces a BMP of approximately 24–25 MB. See the file size reference table below.

What BMP is — and why it produces very large files

BMP (Bitmap) is a raster image format developed by Microsoft for the Windows operating system, where it has been the native image format since Windows 1.0 in 1985. BMP stores image data as a direct grid of pixel color values — each pixel is stored as its full color value (typically 3 bytes for 24-bit color: one byte each for red, green, and blue). There is no compression algorithm applied to reduce redundant data. The file size is determined simply by: width × height × bytes per pixel.

This direct pixel-storage approach means BMP is one of the simplest image formats to read and write — any system that can process basic file I/O can read a BMP without a decompression library. It also means BMP produces the largest file sizes of any common image format for the same content. A PNG file with lossless compression achieves the same zero-quality-loss result at 70–88% smaller file sizes by identifying and removing redundant patterns in the pixel data.

BMP files from PDF to BMP conversion can be very large — easily 10–25 MB per page at 300 DPI. A 5-page PDF converted to BMP at 300 DPI produces approximately 120–125 MB of BMP files. Before converting, confirm that your target system or workflow actually requires BMP. If lossless image quality is the goal, PDF to PNG produces identical quality at a fraction of the file size. If BMP is genuinely required, consider whether a lower DPI setting is acceptable to reduce file size, as long as the output resolution meets the application's minimum requirement.

BMP vs PNG vs JPG — choosing the right format

The table below compares BMP to PNG and JPG across the key dimensions that matter for PDF to image conversion:

	BMP	PNG	JPG
Compression	None or minimal (RLE for some BMP variants). Every pixel stored at full bit depth. No algorithms applied.	Lossless (DEFLATE). Every pixel stored exactly, with efficient compression reducing file size by 50–80% vs uncompressed.	Lossy. Discards some image data to achieve very small file sizes. Quality setting controls how much is discarded.
File size	Very large. An A4 page at 300 DPI is approximately 24–25 MB — the largest of the three formats for the same content.	Medium. Typically 70–88% smaller than equivalent BMP while maintaining identical quality.	Small to medium. Typically 88–96% smaller than equivalent BMP for photographic content.
Image quality	Perfect — no algorithms, no trade-offs. What is rendered is stored exactly.	Perfect — lossless compression, zero quality loss from the rendering.	Excellent for photographs; introduces artefacts on text and sharp edges due to lossy compression.
Transparency	Not supported. All pixels have a solid color. Transparent areas become white.	Full alpha channel transparency supported.	Not supported. Transparent areas become white.
Platform compatibility	Universal on Windows since 1985. Native to all Windows applications. Not natively displayed in web browsers. May be unsupported in some non-Windows applications.	Universal. All browsers, operating systems, design tools, and applications support PNG.	Universal. The most widely supported image format across all platforms and use cases.
Choose BMP when	The target system or application specifically requires BMP — legacy Windows software, embedded systems, industrial controllers, or specific technical workflows where BMP is the mandated input format.	Lossless quality is needed with broad compatibility. PNG serves most use cases that might otherwise use BMP, at a fraction of the file size.	File size and compatibility are the priority for sharing, web use, or platforms where image quality loss is acceptable.

File size reference — BMP vs PNG vs JPG at different DPI

The practical impact of BMP's uncompressed storage is most visible when comparing file sizes across DPI levels. The table below shows approximate file sizes for an A4-sized PDF page:

DPI	Pixel dimensions (A4)	BMP file size	PNG equivalent	JPG equivalent
72 DPI	595 × 842 px	~1.4 MB	~50–150 KB	~30–80 KB
96 DPI	794 × 1123 px	~2.5 MB	~100–300 KB	~50–120 KB
150 DPI	1240 × 1754 px	~6.2 MB	~300–700 KB	~100–300 KB
300 DPI	2480 × 3508 px	~24.8 MB	~1–4 MB	~400 KB–2 MB
600 DPI	4961 × 7016 px	~99 MB	~4–12 MB	~2–5 MB

If BMP file sizes are too large for your workflow, the most practical solutions are: (1) reduce the DPI setting — if 150 DPI is acceptable instead of 300 DPI, the BMP is approximately 25% of the 300 DPI size; (2) switch to PNG — identical lossless quality, 70–88% smaller files, and broader compatibility; (3) process the BMP files after conversion using Windows Paint (File → Save As → PNG or JPG) to convert them to a more practical format for the specific steps that don't require BMP.

When PDF to BMP is the right choice — genuine use cases

Most users who come to PDF to BMP do not actually need BMP — they need a lossless image of a PDF page, for which PNG is more practical. The following are the scenarios where BMP is genuinely the appropriate or required format:

Scenario	Why BMP is used	Consider as alternative
Legacy Windows applications that require BMP input	Some older Windows desktop software — particularly applications developed in the 1990s or early 2000s — accept only BMP as the image input format. These include certain automation tools, device drivers, industrial control interfaces, and custom enterprise applications that were built before modern image format support was widespread.	If a newer version of the application is available, it likely supports PNG or TIFF. Use BMP only if the legacy application explicitly requires it.
Embedded systems and microcontroller displays	Embedded systems, industrial displays, and microcontrollers often use BMP as the simplest image format to parse. The uncompressed pixel data can be read directly without a decompression algorithm, making BMP ideal for resource-constrained environments where processing overhead must be minimized.	No practical alternative if the embedded system requires raw uncompressed pixels. BMP is often genuinely the right format for this use case.
Windows Wallpaper and system UI customization	Windows natively uses BMP for wallpapers and some system image assets. While modern Windows versions accept JPG and PNG, some older group policy configurations, kiosk systems, and locked-down Windows deployments require BMP for wallpaper and UI images.	Modern Windows versions and most deployment tools accept PNG or JPG for wallpapers and UI assets. Use BMP only if the specific deployment requires it.
Paint, imaging, and basic graphic tool compatibility	Microsoft Paint (Windows built-in) defaults to BMP format and works most natively with BMP files. For basic image editing and manipulation in Paint, BMP avoids any format conversion step.	Windows 10 and later versions of Paint support PNG, JPG, GIF, and other formats. For any workflow beyond basic Paint use, PNG is a better default.
Technical documentation requiring uncompressed pixel accuracy	Some technical verification, image analysis, and machine vision workflows require uncompressed pixel-accurate images where no compression algorithm has introduced any modification to the rendered pixel values. BMP guarantees this.	PNG also provides lossless quality with zero quality loss and is smaller. PNG is suitable for pixel accuracy requirements in most workflows. BMP's advantage over PNG for this use case is only in the simplicity of the raw format for certain image analysis tools.

Usage limits

Account type	Daily conversions	Max file size	Files per session
Guest	25 per day	10 MB per file	Up to 5 files
Registered	100 per day	40 MB per file	Up to 20 files

Related tools

PDF to PNG — convert PDF pages to lossless PNG images. Identical quality to BMP at 70–88% smaller file sizes with universal compatibility. The better choice for almost all use cases.
PDF to JPG — convert PDF pages to JPEG images. Best for photographic content and web sharing where file size is the priority.
PDF to TIFF — convert PDF pages to TIFF images for professional print workflows.
BMP to PDF — the reverse: combine BMP images into a PDF document.
Remove PDF Pages — extract specific pages before conversion to avoid converting an entire PDF when only certain pages are needed.

Frequently asked questions

What is BMP and why are BMP files so large?

BMP (Bitmap) is a raster image format developed by Microsoft that stores every pixel as a direct color value with no compression applied. Each pixel in a 24-bit BMP file uses 3 bytes of storage — one byte each for the red, green, and blue color values. File size equals width × height × 3 bytes. There is no algorithm to find and remove redundant patterns, so even large areas of identical color take the same space as highly varied content. An A4 page at 300 DPI is approximately 2,480 × 3,508 pixels, producing a file of about 24.8 MB. This is why BMP files are much larger than PNG or JPG for the same image content.

Why would I need BMP instead of PNG or JPG?

For most use cases, you would not. PNG provides identical lossless quality at 70–88% smaller file sizes and is supported by every platform and application. JPG provides excellent quality at even smaller sizes for photographic content. BMP is genuinely needed only when a specific system requires it: legacy Windows applications from the 1990s–early 2000s that accept only BMP, embedded systems and microcontrollers that read raw uncompressed pixel data directly, certain Windows group policy or kiosk configurations that require BMP for wallpapers, and some technical image analysis tools that expect uncompressed bitmap input. If your system or application can accept PNG, use PNG.

Does each PDF page become a separate BMP file?

Yes. The converter renders each page of the uploaded PDF as its own individual BMP file. A 10-page PDF produces 10 BMP files, typically named sequentially (page-1.bmp, page-2.bmp) and packaged in a ZIP archive for download. Each BMP captures the complete visual content of one PDF page — text, images, backgrounds, and graphics — as they appear in the PDF.

How do I reduce the file size of BMP output?

BMP files are inherently large because they are uncompressed. The primary ways to reduce size: (1) reduce the output DPI — 150 DPI produces a BMP roughly 25% the size of 300 DPI, at lower but still usable image resolution; (2) convert the BMP to PNG after downloading — open in Windows Paint and Save As PNG, or use any image editor. PNG achieves the same lossless quality at 70–88% smaller file sizes; (3) if your target application can accept PNG, use PDF to PNG directly and skip BMP entirely.

Will the BMP look exactly like the PDF page?

Yes — the BMP is a pixel-accurate visual render of the PDF page at the selected resolution. Text, fonts, images, colors, backgrounds, and layout appear exactly as they do in the PDF. Because BMP applies no compression, no quality is discarded — the rendered image is stored exactly as produced by the rendering engine. The sharpness of the output is determined by the output DPI and the quality of the source PDF. A vector PDF (from Word, Excel, or design tools) renders sharply at any DPI. A scanned PDF renders at the quality of the original scan.

Can I convert BMP back to PDF?

Yes — use the ToolsPiNG BMP to PDF converter, which combines BMP images into a PDF document. This is the reverse of the PDF to BMP operation. Note that converting PDF → BMP → PDF goes through a lossy pipeline: the BMP is an uncompressed raster render of the PDF page, and re-converting it to PDF re-embeds the raster image rather than restoring the original vector content. The resulting PDF will be larger and contain image-only pages rather than text-extractable content.

Is BMP supported on macOS and Linux?

BMP support on macOS and Linux is limited compared to Windows. macOS Preview can open BMP files. Most Linux image viewers (GIMP, Shotwell, eog) open BMP. However, BMP is not natively supported by web browsers on any platform, and many design tools and image processing libraries on macOS and Linux have better support for PNG and TIFF than for BMP. If the intended recipient or workflow is on macOS or Linux and does not specifically require BMP, use PNG instead.

Is the PDF to BMP Converter free?

Yes. The converter is free within the daily usage limits shown above. Guest users can run 25 conversion sessions per day and upload up to 5 files per session (10 MB each) without creating an account. Registering a free ToolsPiNG account increases the daily limit to 100 sessions, the file size limit to 40 MB per file, and the per-session file count to 20.