Images

BMP → AVIF

Learn about the formats: What is BMP? What is AVIF?

Convert your heavy BMP raster images into modern AVIF files instantly. This tool helps web developers and designers drastically reduce image file sizes for better website performance.

BMP is an uncompressed raster image format developed by Microsoft, known for its massive file sizes because it stores every single pixel without data loss. AVIF, on the other hand, is a modern raster image format based on the AV1 video codec that delivers superior compression and supports advanced features like transparency and high dynamic range. When you convert BMP to AVIF, the tool takes the uncompressed bitmap data and applies advanced lossy compression algorithms, resulting in a much smaller file.

Since you are converting from a lossless format (BMP) to a format with lossy compression options (AVIF), a small amount of data will be discarded to achieve high compression ratios, though the visual quality remains remarkably high.

Tips

Adjust the AVIF quality slider to find the optimal balance between file size and visual fidelity.
Use AVIF instead of BMP for web deployment to drastically improve page loading speed.
Ensure your target platform supports AVIF playback before replacing all legacy assets.

Common use cases

Optimizing legacy Windows bitmap graphics for modern web browsers.
Reducing portfolio website loading times by shrinking heavy raw graphic assets.
Preparing high-resolution design mockups for fast sharing over email or cloud storage.

Why ConvertX stays free — forever

We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

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Audio

Music, podcasts, voice recordings, and sound effects.

Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS

Advantages

+ FLAC and WAV preserve full quality for editing
+ MP3 and AAC are universally compatible
+ OPUS delivers great quality at low bitrates

Disadvantages

− Uncompressed WAV files are very large
− Lossy formats cannot be restored to original quality
− DRM-protected files may not convert

Frequently asked questions

Yes, because BMP is uncompressed and AVIF uses lossy compression, some data is discarded. However, AVIF maintains excellent visual quality at a fraction of the original file size.

BMP stores raw, uncompressed pixel data, whereas AVIF uses advanced predictive coding and compression techniques derived from video codecs to eliminate redundancies.

Most modern browsers support AVIF, but it is always wise to check compatibility if your audience uses older software.

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