How to Convert Images: JPG, PNG, WebP & More

Converting between image formats is one of those tasks that seems trivial — just pick a different extension, right? Not quite. Each format has strengths, weaknesses, and specific use cases. Convert to the wrong format and you'll end up with bloated files, lost transparency, or visible artifacts. In this guide, we'll walk through every major image format, when to use each, and how to convert between them properly.

The Major Image Formats at a Glance

JPEG (Joint Photographic Experts Group)

Type: Lossy compression Best for: Photographs, complex images with gradients, web content where small file size matters Key feature: Excellent compression for photos — 10-20x size reduction at quality 80 with minimal visible loss Limitations: No transparency support. Not suitable for text, logos, or graphics with sharp edges. Quality degrades with repeated saves.

PNG (Portable Network Graphics)

Type: Lossless compression Best for: Logos, icons, screenshots, images with text, graphics with sharp edges and flat colors Key feature: Full alpha transparency support. Pixel-perfect reproduction — no compression artifacts ever. Limitations: Large file sizes for photos — 3-10x larger than JPEG for photographic content. Not ideal for web photos.

WebP

Type: Both lossy and lossless Best for: Universal web format — replacement for both JPEG and PNG in most cases Key feature: 25-35% smaller than JPEG at equivalent quality. Supports both transparency (like PNG) and lossy compression (like JPEG). Limitations: Slightly less supported than JPEG/PNG on very old browsers (pre-2019), but universal on modern browsers.

AVIF (AV1 Image File Format)

Type: Both lossy and lossless Best for: Next-generation web delivery where maximum compression matters Key feature: Up to 50% smaller than JPEG at equivalent quality. Supports HDR, wide color gamut, and transparency. Limitations: Slower to encode. Safari support arrived in iOS 16 / macOS Ventura. Not ideal as an archival format yet.

SVG (Scalable Vector Graphics)

Type: Vector (not raster) Best for: Logos, icons, illustrations, diagrams — anything that can be described mathematically Key feature: Infinitely scalable without quality loss. Tiny file sizes for simple graphics. Can be styled with CSS. Limitations: Not suitable for photographs. Complex SVGs can become large and slow to render.

GIF

Type: Lossless (but limited to 256 colors) Best for: Simple animations, but WebP/AVIF animated formats are superior for modern use Limitations: 256-color limit creates visible banding. Large file sizes for complex animations. Use animated WebP or MP4 for modern animation needs.

The Conversion Decision Tree

Here's how to choose the right output format:

1. Is the source a photo? → Convert to WebP or JPEG. WebP is preferred for web use; JPEG for maximum compatibility.
2. Does it have transparency? → Convert to PNG or lossless WebP. WebP is usually smaller.
3. Is it a logo or icon? → Convert to SVG if possible (vector). Otherwise use PNG or WebP.
4. Is it text-heavy or a screenshot? → Convert to PNG or lossless WebP. Lossy formats will blur text.
5. Is it for archival? → Convert to PNG (lossless, universal) or keep as original format.
6. Is it for maximum web performance? → Convert to AVIF with a JPEG/WebP fallback.

Step-by-Step: Converting Images with SaveVex

1. Go to the Image Convert tool on SaveVex.
2. Upload one or more images. Supported input formats include JPG, PNG, WebP, AVIF, GIF, BMP, SVG, and TIFF.
3. Choose your output format from the dropdown.
4. For lossy formats (JPEG, lossy WebP, AVIF), set the quality slider. Start at 85 for photos.
5. For PNG, choose between 8-bit (smaller, fewer colors, good for simple graphics) and 24-bit (full color, larger, good for complex images).
6. Click convert. Processing is instant because it happens locally in your browser.
7. Download the converted image or a ZIP of all converted files.

Format-Specific Conversion Tips

JPEG to WebP

The most impactful conversion for web performance. At quality 80, expect 25-35% size reduction with no visible quality difference. Always test visually — a small percentage of images benefit from slightly higher quality settings.

JPEG to PNG

Avoid this. JPEG compression artifacts are permanent, so converting JPEG to PNG produces a large file that still has the JPEG's artifacts. You can't recover lost quality by converting to a lossless format.

PNG to JPEG

This is useful when you have a PNG photograph (perhaps from a screenshot or graphic design tool) that doesn't need transparency. Converting to JPEG at quality 85 can reduce file size by 80% or more. If the PNG has transparency, decide how to handle it — either flatten to a white background or keep as WebP instead.

PNG to SVG

You cannot directly convert a raster image to a vector format. This requires tracing/vectorization, which is a different process entirely. Use a vector graphics editor for this.

WebP to JPEG

Use this when you need maximum compatibility — for example, sending images to someone who might open them in very old software. The quality difference is negligible for photos.

Batch Conversion Tips

When converting many images at once:

• Be consistent with your output format and quality settings.
• Check a few converted files before downloading the whole batch. It's faster to catch a mistake on 3 files than 300.
• Preserve original file names or use a consistent naming scheme so you can match originals to converted files.
• Keep your originals. Conversion is often a one-way street. Always retain the source files.

FAQ

Q: Does converting between lossy formats reduce quality? A: Yes, but minimally at high quality settings. Converting JPEG at quality 90 to WebP at quality 85 is essentially lossless to the human eye. Avoid multiple generations of lossy-to-lossy conversion — always convert from the original when possible.

Q: Can I convert a PDF page to an image? A: Yes, but this is a different operation. SaveVex offers PDF-to-Image tools specifically designed for this rather than the standard image converter.

Q: What's the best format for social media? A: JPEG is still the safest bet for universal compatibility. Most social platforms convert uploaded images to their own optimized formats anyway, so sending a high-quality JPEG gives them the best source material.

Q: Should I convert all my website images to WebP? A: Yes, for any website built in 2026, WebP should be your default format. It's supported by every modern browser and is significantly smaller than JPEG and PNG equivalents.

Conclusion

Image conversion is about matching the format to the use case. Photographs belong in lossy formats (WebP, JPEG, AVIF). Logos and screenshots belong in lossless formats (PNG, lossless WebP). Vector graphics belong in SVG. Once you understand the strengths of each format, converting between them becomes second nature — and your websites, emails, and documents will be faster and better-looking as a result.