BMP to AVIF converter: free, fast and secure
This free BMP to AVIF converter turns your BMP images into AVIF files in seconds, right in your browser. BMP files are uncompressed and very heavy. AVIF gives you the same picture at a fraction of the size. AVIF gives the smallest file size of any common format, perfect for speeding up modern websites and online stores.
Unlike most converters, ConvertKaro never uploads your images. The conversion happens on your own device, so it is quicker, there are no file limits, and your photos stay private.
How to convert BMP to AVIF in 3 steps
- Add your BMP files. Tap “Select files” or drag and drop one or more .bmp images into the box above. You can also paste a screenshot with Ctrl+V.
- Adjust the options. Set the quality slider. Lower quality means a smaller AVIF file.
- Download your AVIF. Conversion starts instantly. Download each AVIF file, or all of them at once as a ZIP.
Why use ConvertKaro BMP to AVIF? Free, fast and secure
There are many BMP to AVIF websites, but most of them upload your files, add watermarks or ask you to pay. Here is why this one is better.
100% Free
BMP to AVIF on ConvertKaro costs nothing. There is no trial, no premium plan and no hidden limit, so you can use it as often as you like.
Fast results
Because nothing travels to a server, results appear almost instantly. Large files are limited only by the speed of your own phone or computer.
Secure and private
Nothing is uploaded. Sensitive files like Aadhaar, PAN, salary slips or contracts stay on your own phone or laptop the whole time.
No signup, no watermark
No account, no email and no watermark on your result. Open the page and start.
Works on every device
Designed for mobile first, so it works just as well on your phone as on a desktop computer.
Quality you control
A simple quality slider lets you choose between the smallest file and the best picture, with a sensible default already set.
ConvertKaro vs other online converters
| ConvertKaro | Typical online tool | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your files | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
BMP vs AVIF: what is the difference?
Both formats store images, but they are built for different jobs. Here is a quick comparison.
| BMP | AVIF | |
|---|---|---|
| Full name | Bitmap Image File | AV1 Image File Format |
| Type | Raster, uncompressed | Raster, lossy or lossless |
| Compression | None | Lossy and lossless (AV1) |
| Transparency | No | Yes |
| Animation | No | Yes |
| File size | Very large | Smallest |
| Support | Windows and most editors | Chrome, Edge, Firefox, Safari 16+; few desktop apps |
| Best for | Legacy Windows software, some printers and machines | High-performance websites, modern apps |
What is BMP?
BMP is the classic Windows bitmap format. It stores every pixel without compression, so the quality is perfect but the files are huge: a normal phone photo can become 10–30 MB. Today BMP is mostly used by older Windows programs, embroidery and printing machines, and some industrial software that expects raw pixel data.
What is AVIF?
AVIF is the newest mainstream image format, based on the AV1 video codec. It often makes files 30–50% smaller than JPG and noticeably smaller than WEBP at the same visual quality, with support for transparency, HDR and wide colour. Modern browsers display AVIF, but many desktop apps, older phones and upload forms still cannot open it.
When should you convert BMP to AVIF?
- Hero images and banners on modern websites
- Image-heavy apps where every kilobyte counts
- Next-generation e-commerce catalogues
- Testing the best possible compression
Tips for the best AVIF results
- For websites, 75–85% quality is usually the best balance between size and sharpness.
- You can convert many BMP files at once. They are processed one after another and can be downloaded together as a ZIP.
- Keep your original BMP files until you have checked the converted AVIF images.
How BMP to AVIF keeps your photos and images private
Most online converters upload your file to their server, process it there and send it back. That costs time, uses your data pack and means a copy of your file sits on someone else’s computer. BMP to AVIF works differently: the page loads the tool into your browser, and your photos and images are processed by your own phone or computer. The file never travels over the internet, so it cannot be leaked, stored or misused.
Using BMP to AVIF on your phone
BMP to AVIF is designed for small screens. Buttons are large, options are simple, and downloads save directly to your phone storage. On iPhone, downloaded files appear in the Files app under Downloads; on Android they go to the Downloads folder.
Who uses BMP to AVIF?
Here are some of the people who find this tool most useful:
- Students uploading photos and signatures to exam and admission forms
- Online sellers preparing product photos for Instagram, Meesho, Amazon and Shopify
- Office staff handling ID cards, scans and screenshots
- Bloggers and web designers who need fast-loading images
- Anyone sharing pictures on WhatsApp, email or social media
Supported input: JPG, JPEG, PNG, WEBP, HEIC/HEIF (iPhone), AVIF, GIF, BMP, TIFF and SVG.
Frequently asked questions
Will converting BMP to AVIF reduce quality?
AVIF stores the image lossy and lossless (av1), so no extra quality is lost during conversion.
Does AVIF keep transparency from BMP?
BMP images do not have transparent areas, so there is nothing to lose. AVIF can hold transparency if you edit the image later.
Can I convert multiple BMP files to AVIF at once?
Yes. Select or drop as many BMP images as you like. Each one is converted separately, and you can download them all together as a ZIP file.
Is BMP to AVIF really free?
Yes. BMP to AVIF on ConvertKaro is 100% free with no limits, no signup and no watermark. There is no paid version.
Is it safe to use BMP to AVIF online?
It is one of the safest ways to do it, because nothing is uploaded. All processing happens locally on your device, and the files disappear when you close the page.
Does BMP to AVIF work on mobile?
Yes. It works in Chrome and Safari on Android phones and iPhones, as well as on tablets and computers. No app is needed.
Is there a file size limit in BMP to AVIF?
No upload means no server limit. The only limit is your device’s memory, which comfortably handles everyday files and even large batches.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Your downloaded file is exactly your result.
Does BMP to AVIF work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.