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Image Format Converter — JPG, PNG, WebP, AVIF, | LazyTools
Image Tool

Image Format Converter — JPG, PNG, WebP, AVIF & BMP

Convert images between five formats — JPG, PNG, WebP, AVIF and BMP — entirely in your browser. Furthermore, the quality slider controls compression for JPG and WebP outputs. No file is uploaded to any server. The format selector shows only formats your browser supports for output, preventing unsupported conversion attempts.

JPG / PNG / WebP / AVIF / BMPQuality slider for lossy formatsBrowser-native — no serverAuto-detects output supportInstant download
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Drop image or click to upload
Any image format — JPG, PNG, WebP, AVIF, BMP

How to use the Image Format Converter

1

Upload any image

Drop any image file onto the drop zone — JPG, PNG, WebP, AVIF, BMP or GIF. Furthermore, the browser decodes the source image using its built-in image decoders. The original file type and size appear in the stats strip after loading.

2

Select the output format

Choose JPG, PNG, WebP or BMP from the format selector. Furthermore, a format tip appears below the preview explaining the key properties of each format. Adjust the quality slider for JPG and WebP outputs — PNG. BMP use lossless encoding and do not use the quality setting.

3

Preview and download

The converted image preview appears instantly. Furthermore, the stats strip shows original and estimated output file sizes for comparison. Click Download to save the converted image.

Image format selection guide

Choosing the right format for each use case produces the best balance of file size, quality and compatibility. Furthermore, the wrong format choice can result in unnecessarily large files or quality loss.

FormatCompressionTransparencyBest for
JPGLossyNoPhotographs, social media, email
PNGLosslessYesScreenshots, logos, icons, graphics
WebPLossy or losslessYesWeb images — modern browsers
BMPNone (uncompressed)NoLegacy Windows applications, very large files

How format conversion works

The Canvas API encodes pixel data in the target format using the browser's built-in encoders. Furthermore, quality only applies to lossy formats — it has no effect on lossless PNG and BMP output.

canvas.toDataURL('image/jpeg', 0.9) → base64-encoded JPG at 90% quality
Lossy formats: JPEG, WebP — quality parameter 0.0–1.0 applies
Lossless formats: PNG, BMP — quality parameter ignored
White fill: ctx.fillRect before drawImage prevents black transparency in JPG

Worked example: converting a PNG logo to WebP for web use

A web developer has a 450 KB PNG logo to use in a Next.js web application. Converting to WebP reduces the file size significantly while supporting transparency.

The 450 KB PNG converts to a 68 KB WebP — an 85% size reduction. Furthermore, WebP supports transparency like PNG, so the logo background remains transparent. Moreover, all modern browsers support WebP, making it the ideal choice for web applications where PNG was previously used for transparency support.

What is image format conversion?

Image format conversion changes the file format of an image — the encoding method, compression algorithm. File structure — while preserving the visual content. Furthermore, different formats suit different use cases: JPG for compressed photographs, PNG for lossless graphics with transparency, WebP for efficient web delivery and BMP for legacy compatibility. Choosing the right format for each context reduces file sizes, improves loading performance and ensures compatibility with the destination application. Moreover, format conversion is one of the most common image preprocessing tasks in web development, digital marketing and document production workflows.

Lossy versus lossless format conversion

Converting from a lossless format (PNG) to a lossy format (JPG) permanently reduces quality in proportion to the quality setting. Furthermore, converting from a lossy format (JPG) to a lossless format (PNG) does not restore the quality lost during the original JPG compression — it simply stores the already-compressed pixels without further loss. Moreover, the most quality-preserving approach converts from a high-quality source — always convert from the highest-quality version of the original image rather than from a compressed derivative.

Why WebP adoption is accelerating

WebP support across all major browsers reached near-universal status by 2022. Furthermore, Google Lighthouse and Core Web Vitals guidelines recommend WebP over JPG for web pages because of the 25–35% file size advantage at equivalent quality. WordPress, Shopify and most major CMS platforms now auto-convert uploaded images to WebP for delivery. Moreover, developers migrating existing JPG libraries to WebP report significant page performance improvements — particularly for image-heavy product and portfolio pages.

Frequently asked questions

No — converting a JPG to PNG does not restore quality lost during JPG compression. Furthermore, the existing compression artefacts in the JPG are preserved exactly in the PNG — they are just stored without further loss in the lossless PNG format. The resulting PNG file is larger than the JPG without any quality improvement. Moreover, PNG is only beneficial over JPG when the source is a lossless image that needs transparency or sharp-edged graphics.
BMP (Bitmap) format stores pixel data without compression — every pixel takes exactly three or four bytes regardless of the image content. Furthermore, a 1920×1080 pixel BMP file requires approximately 6 MB regardless of the image content, compared to 200 KB–2 MB for the same image in JPG or PNG. BMP has essentially no practical advantages over PNG — PNG is lossless and much smaller. Moreover, BMP support is limited to Windows-specific applications and legacy software.
All major browsers have supported WebP since 2022 — Chrome, Firefox, Safari, Edge and Samsung Internet all support WebP natively. Furthermore, Safari added WebP support in version 14 (macOS Big Sur and iOS 14). Older browsers — Internet Explorer, older Android browsers — do not support WebP. Moreover, for websites that must support legacy browsers, serving WebP to modern browsers and JPG as a fallback using the HTML picture element is the recommended approach.
The tool currently converts one image per session. Furthermore, drop a new image to replace the current one. For batch format conversion of many files, ImageMagick's command-line mogrify converts hundreds of files with a single command: mogrify -format webp *.jpg. Moreover, online batch converters also exist but require uploading images to a server — the browser-based single-file approach here provides privacy for sensitive images.
JPG does not support transparency — transparent pixels become solid white in the output. Furthermore, the tool fills the canvas with white before drawing the image, producing a clean white background where transparency existed in the source PNG. This is the standard approach for PNG-to-JPG conversion. Moreover, if a different background colour is needed, use the Background Remover tool with a custom replacement colour before converting to JPG.

Related tools

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Image Compressor

Compress after converting to reduce file size. Furthermore, target file size mode hits exact KB limits.

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AVIF to JPG

Dedicated AVIF-to-JPG converter. Furthermore, quality slider and format selector included.

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HEIC to JPG Converter

Convert iPhone HEIC photos to JPG. Furthermore, browser-native Apple decoder used.

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Background Remover

Remove backgrounds before converting format. Furthermore, custom replacement colour available.

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Image Resizer & Cropper

Resize after converting to exact dimensions. Furthermore, 16 social media presets included.

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Metadata Remover

Strip EXIF before converting format. Furthermore, before/after diff shows removed data.

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