What is raster image conversion?

Raster image conversion is the process of re-encoding a pixel-based image from one format (e.g. PNG) to another (e.g. JPG), often to reduce file size, add transparency, or improve compatibility with a specific application.

Will converting reduce image quality?

Converting to a lossless format such as PNG or TIFF preserves all original pixel data. Converting to a lossy format such as JPG or WEBP may reduce quality slightly, but you can adjust the compression level to balance size and quality.

Which format should I use for the web?

WEBP offers the best compression for modern browsers. PNG is best for graphics with transparency. JPG is best for photographs. Use GIF only for simple animations.

Is the converter free?

Yes — all 36 conversions are completely free with no account, watermarks, or usage limits.

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JPG · PNG · WEBP · GIF · BMP · TIFF 36 Conversions Browser-Based Free & Instant

Raster to Raster Converter

Convert between JPG, PNG, WebP, GIF, BMP, and TIFF image formats — instantly in your browser, with no quality loss and no sign-up required.

Available Format Conversions

36 conversions across all combinations of JPG, PNG, GIF, BMP, TIFF, and WEBP.

JPG → Other Formats

PNG → Other Formats

GIF → Other Formats

BMP → Other Formats

TIFF → Other Formats

WEBP → Other Formats

Why convert raster formats?

Different image formats have different strengths — convert to the one that fits your use case.

Fast & secure

Files are processed entirely in your browser — nothing is uploaded to any server. Instant conversion with complete privacy.

Quality preserved

Lossless formats (PNG, TIFF, BMP) retain every pixel perfectly. Lossy formats (JPG, WEBP) let you dial in compression to balance size and quality.

Works everywhere

Use on any device — desktop, tablet, or mobile. No software to install and no plugins required. All you need is a modern browser.

Unlimited usage

Convert as many images as you need, completely free. No registration, no file size limits, and no hidden fees — ever.

Choosing the right raster format

Pick the format that best matches your file size, quality, and compatibility needs.

JPG

JPEG

Best for photos & small files

Lossy compression producing compact files. Ideal for photographs and any image where a small size matters more than pixel-perfect accuracy.

LossyPhotosEmailSmall size

PNG

Portable Network Graphics

Best for graphics & transparency

Lossless compression with full alpha-channel transparency. The go-to choice for logos, screenshots, UI assets, and graphics with transparent backgrounds.

LosslessTransparencyWebUI

WEBP

WebP

Best for modern web performance

Google's modern format offering superior compression over both PNG and JPG, with optional transparency support. Best choice for web performance.

Modern webTransparencySmallest size

GIF

Graphics Interchange Format

Best for animations

Limited to 256 colours but supports frame-based animation and transparency. Widely used for animated stickers and simple looping graphics.

AnimationTransparency256 colours

BMP

Bitmap

Best for Windows compatibility

An uncompressed format with near-universal Windows application support. Very large file sizes but zero quality loss.

UncompressedWindowsLegacy

TIFF

Tagged Image File Format

Best for print & archiving

Professional lossless format used in print production, scanning, and long-term archiving. Supports very high bit depths and multiple layers.

LosslessPrintArchivingHigh DPI

Frequently asked questions

Common questions about raster image format conversion.

: Raster image conversion is the process of re-encoding a pixel-based image from one format (e.g. PNG) to another (e.g. JPG), often to reduce file size, add transparency, improve compatibility, or meet a platform's requirements.
: Converting to a lossless format such as PNG, TIFF, or BMP preserves all original pixel data with no quality loss. Converting to a lossy format such as JPG or WEBP may reduce quality slightly, but the compression level is adjustable so you can balance file size against visual quality.
: WEBP delivers the best compression for modern browsers and supports transparency. Use PNG for logos and graphics that need transparency. Use JPG for photographs where file size matters. Use GIF only for simple animations.
: Yes. Converting JPG to PNG produces a lossless copy of the pixel data present in the JPG — however, any quality already lost by the original JPG compression cannot be recovered by the conversion.
: Yes — all 36 conversions on PortImg are completely free with no account required, no watermarks, and no usage limits.

What is raster image format conversion?

Raster images store visual information as a grid of coloured pixels. Format conversion re-encodes that pixel data using a different compression algorithm and container — for example, changing a PNG's lossless compression into JPG's more compact lossy encoding, or adding WEBP's modern codec for better web performance. The dimensions and visual content of the image remain the same; only the encoding changes.

When do you need to convert between raster formats?

Common scenarios include: reducing a large PNG to a smaller JPG or WEBP before uploading to a website; converting a TIFF from a scanner into a widely compatible JPG for sharing; changing a JPG to PNG to add a transparent background; converting any format to WEBP for improved page-load speed; or meeting a platform's specific file format requirement. With 36 conversion combinations available, PortImg covers every combination of the six most widely used raster formats.

Ready to convert your images?

36 format combinations available — free, instant, no sign-up.