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?

If you've ever tried to open a BMP file and hit a wall — the app won't accept it, the website rejects it, or the preview just shows a broken icon — you already know why this conversion matters.

Bitmap Image File is great for what it was designed for, but it has real-world limitations: no compression = massive files and not suitable for web. The moment you step outside that original context, it gets frustrating fast.

Portable Network Graphics is the safer choice for Logos and UI assets, Screenshots, Images requiring transparency. Its main advantages — lossless compression — pixel-perfect quality and full alpha transparency (8-bit alpha channel) — mean it just works wherever you need it.

A few common reasons people end up here: - Their target app, site, or device doesn't accept BMP - They need a smaller file for email or upload (PNG often compresses better) - They need Portable Network Graphics's specific capability: lossless compression — pixel-perfect quality - Compatibility with older software that pre-dates Bitmap Image File

The conversion is one-way: you get a PNG that works everywhere Portable Network Graphics is expected. The original BMP file is not touched.

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 BMPfiles 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.