Convert BMP to PNG Online — For Lossless Compression

50–70% smaller than BMP with lossless quality. Ideal for web and modern workflows.

Drop up to 50 BMP files at once — no install, no sign-up required.

Drop BMP Files Here

50 MB per file Up to 50 files (2 GB limit) 3 parallel conversions 1 credit per 5 MB

Encrypted EU Servers Auto-delete 1h

⚡ Median BMP → PNG time (last 10k jobs): 161ms

Resize: OffSmart Compression: Off

How it works

1 · Drop your files
Drag & drop or choose BMP/DIB files. No account required on Free—paid plans unlock bigger batches, higher limits, and priority queues.
2 · We convert securely
Processed on our dedicated servers. Encrypted in transit & at rest. Metadata stripped by default. We never store filenames—only file types & sizes for accounting. We never train AI models on uploads.
3 · Download & auto-delete
Grab your PNGs in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.

About BMP →

BMP (Bitmap Image File) is Microsoft's native raster graphics format, typically storing uncompressed pixel data in BGR color order. Introduced with Windows 1.0 in 1985, BMP files are straightforward—essentially raw pixel arrays with minimal metadata—but extremely large compared to compressed formats. While BMP supports optional RLE compression, most implementations store pixels uncompressed for simplicity and compatibility.

Learn more: BMP on Wikipedia

BMP is primarily encountered in legacy Windows applications and embedded systems where simplicity matters more than file size. For modern use, PNG offers lossless compression with universal compatibility at a fraction of the file size.

About PNG →

PNG (Portable Network Graphics) provides lossless compression with full alpha channel transparency, making it the go-to format for graphics, screenshots, and images requiring pixel-perfect fidelity. Created in 1996 as a patent-free GIF alternative, PNG uses DEFLATE compression and supports both indexed color (PNG-8) and truecolor with alpha (PNG-24/32). Files are 3-10× larger than equivalent JPEGs but preserve every pixel exactly.

Learn more: PNG on Wikipedia

PNG is universally supported and ideal for logos, UI elements, diagrams, and any content where transparency or lossless editing matters. For photographic content without transparency needs, JPEG typically offers better compression efficiency.

Frequently Asked Questions

Why are BMP files so massive?

BMP is completely uncompressed—every pixel stored as raw RGB data. A 1920×1080 BMP is always 6.2 MB (width × height × 3 bytes). No compression, no optimization. This is why BMPs are 10-100× larger than PNG/JPG.

How much smaller will my files be?

BMP to PNG typically achieves 50-70% file size reduction with lossless compression. A 10 MB BMP becomes ~3-5 MB PNG with identical pixels. PNG's DEFLATE algorithm compresses repeated patterns efficiently while preserving every pixel. Need even smaller files for photographic content? our BMP to JPG converter achieves 92-95% reduction with excellent quality.

Does PNG preserve transparency from BMP v4/v5 files?

Yes! PNG natively supports alpha channels. BMP v4/v5 transparency (32-bit RGBA) is preserved pixel-perfect in the PNG output. This is PNG's killer feature—perfect for graphics, logos, and overlays. Standard 24-bit BMPs convert directly without alpha.

Will I lose any quality?

Zero quality loss. PNG uses lossless compression (DEFLATE), guaranteeing every pixel is identical to the source BMP. Unlike JPG, there's no approximation or lossy encoding. Perfect for screenshots, graphics, and any image requiring pixel-perfect accuracy. For photographic content where 92-95% smaller files are worth minimal quality trade-offs, try our BMP to JPG converter.

What are the limits for this converter?

Tier	Max File Size	Max Files/Batch	Parallel Processing
Guest/Free	50 MB	50 files	3 at once
Pro	1024 MB	1000 files	6 at once

Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →

How are credits calculated for this conversion?

Cost: 1 credit per 5 MB

How it works:

Files up to 5 MB: 1 credit
6-10 MB: 2 credits
11-15 MB: 3 credits
16-20 MB: 4 credits

Example: A 5 MB image = 1 credit. A 95 MB image = 19 credits.

Why per-megabyte? Larger files require more resources (processing, bandwidth, storage).

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

Tier	Daily Limit	Monthly Limit
Guest	100 credits/day	—
Free	100 credits/day	—
Pro	—	12,000 credits/month

Daily credits (Guest & Free tiers) reset every day at midnight UTC. Monthly credits (Pro) reset on your billing cycle date.

Note: With 1 credit per 5 MB, images under 5 MB cost 1 credit each. Pro users can convert 12,000 images per month.

Answers at a Glance

Quick answers to common questions.

What's New in BMP to PNG

Latest improvements to this converter

Last updated January 13, 2026

Jan 13, 2026

Added Resize and Smart Compression options.

Nov 7, 2025

Initial launch of BMP to PNG converter with lossless compression and full transparency preservation.

Need to get more done? Pro starts from $5.

1 GB files 1,000 per batch Priority queue Web + API

See Pricing →

No subscription required.