Is this BMP to PNG converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple BMP files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

Will the image quality change after conversion?

It depends on the formats involved. Converting to a lossless format like PNG preserves every pixel exactly. Converting to a lossy format like JPEG or WebP applies compression — we default to 85% quality, which looks identical to the original for almost all images. You won't notice a difference unless you zoom in pixel-by-pixel.

Do you support batch image conversion?

Yes — drop multiple images at once and they all convert in parallel. Free accounts handle up to 5 at a time; Pro is unlimited. Download everything as a single ZIP when you're done.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

BMP to PNG Converter — Free, Lossless, No Upload

How to convert BMP to PNG online

1
Drop your BMP file
Drag and drop your Bitmap Image File file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Bitmap Image File → Portable Network Graphics entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your PNG
Your Portable Network Graphics file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

BMP vs PNG: format overview

BMP

Bitmap Image File

Microsoft · 1987

Compression: none
Transparency: No

✓ No compression — original pixel data preserved
✓ Universal Windows support
✗ No compression = massive files

PNG

Portable Network Graphics

PNG Development Group (Thomas Boutell) · 1996

Compression: lossless
Color depth: 16-bit
Transparency: Yes

✓ Lossless compression — pixel-perfect quality
✓ Full alpha transparency (8-bit alpha channel)

BMP magic bytes: 42 4D

PNG magic bytes: 89 50 4E 47 0D 0A 1A 0A

Why convert BMP to PNG?

BMP is one of the oldest raster image formats, introduced with early versions of Windows. It stores pixel data with no compression at all, which means a simple screenshot or icon stored as BMP can consume ten to twenty times more disk space than the same image saved as PNG. If you have a folder of BMP assets exported from an older application like Paint or a legacy CAD tool, the combined file size can become a real storage and transfer problem.

PNG uses lossless compression, so converting from BMP to PNG produces a file that is visually identical to the original while being dramatically smaller. This matters when you are uploading assets to a web project, committing files to a Git repository, or sending graphics as email attachments. Tools like GIMP, Adobe Photoshop, Figma, and virtually every modern image editor prefer PNG over BMP, and most browsers render PNG natively without any plugin.

The conversion from BMP to PNG is entirely lossless, meaning not a single pixel value changes in the process. You will see a significant reduction in file size, commonly 60 to 80 percent smaller, with no perceptible quality difference. Transparency is also unlocked: if your image has a solid background you want to remove later, PNG supports alpha channels while BMP does not. The result is a smaller, more capable, and more universally compatible file.

Quality & file size: BMP to PNG

Typical file sizes: BMP 35–40 MB → PNG 8–25 MB.

Both BMP and PNG use lossy compression. We transcode at high quality settings (equivalent to PNG's recommended web quality) to minimize generational loss.

Color depth: BMP supports standard color, PNG supports 16-bit.

Transparency: BMP does not support transparency. PNG preserves transparency.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your BMP files are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.