The practical answer: use JPG for most photographs, PNG for lossless screenshots or transparency, WebP for efficient modern web delivery, and SVG for artwork that is genuinely vector. Check email or platform support before choosing a newer format, and keep the original master.
JPG, PNG, WebP and SVG comparison table
| Feature | JPG | PNG | WebP | SVG |
|---|---|---|---|---|
| Data type | Raster | Raster | Raster | Vector markup |
| Compression | Lossy | Lossless | Lossy or lossless | Structural text optimisation |
| Transparency | No | Yes | Yes | Yes |
| Animation | No | APNG variant | Yes | Possible, but active content needs care |
| Best fit | Photos | Screenshots and graphics | Modern web images | Logos, icons and illustrations |
| Scales without pixelation | No | No | No | Yes, when artwork is vector |
Choose the format for photographs, logos and screenshots
Photographs
JPG is dependable and compact; WebP often delivers comparable visible quality with less data for modern websites.
Logos and icons
Use SVG when the source consists of vector paths. Use transparent PNG when a raster fallback or pixel-specific appearance is required.
Illustrations
Simple geometric artwork can suit SVG. Textured, painted or photographic illustration is usually better as PNG, JPG or WebP.
Screenshots
PNG protects crisp interface edges and text. WebP lossless can be efficient where the delivery environment supports it.
Raster conversion does not create a genuine vector
JPG, PNG and WebP store a grid of pixels. SVG normally describes shapes, paths, fills and text in resolution-independent markup. Renaming a file or placing a pixel image inside an SVG container does not reconstruct those shapes.
Turning raster artwork into genuine vector paths requires tracing and often manual correction. Ordinary conversion can rasterise SVG into PNG, JPG or WebP, but it cannot honestly promise the reverse. Use Convert Images when you need a supported raster output, and retain the original SVG if future scaling or editing matters.
For existing vectors, the safe SVG optimisation guide explains viewBox preservation, structural cleanup and active-content risks.
Browser, website and email considerations
Modern browsers broadly support these formats, but the surrounding workflow still matters. A CMS, advertising platform, document generator or older email client may transform or reject a format even when a browser displays it.
- Websites: WebP is a strong delivery choice; SVG is excellent for trusted vector assets; provide fallbacks where the audience or system requires them.
- Email: JPG and PNG remain the conservative choices across varied inboxes. Test WebP or SVG rather than assuming consistent support.
- Downloads: choose a format recipients can open and edit, not only the smallest delivery file.
- Security: treat uploaded SVG as markup capable of referencing active or external content; sanitise it before use.
File-size and quality trade-offs
A format is not automatically small. A photographic PNG can dwarf a JPEG; a highly detailed SVG can exceed a compact raster preview; and an already efficient WebP may not benefit from another conversion.
| Scenario | Good starting choice | Reason |
|---|---|---|
| 1200px product photograph | JPG or lossy WebP | Efficient continuous-tone encoding |
| Transparent UI screenshot | PNG or lossless WebP | Sharp edges and alpha transparency |
| Single-colour brand icon | SVG | Scalable paths and compact structure |
| Detailed painted illustration | WebP, JPG or PNG after testing | Complexity may make vector markup inefficient |
Once the format is chosen, use the image compression guide to balance dimensions, encoding and visible quality.
A quick image-format decision guide
- Is the source genuinely made from vector shapes? Choose safe SVG when scalable vector output is needed.
- Does raster artwork need transparency or exact crisp pixels? Compare PNG with lossless WebP.
- Is it a photograph without transparency? Compare JPG with lossy WebP.
- Will it appear in email or a restricted platform? Confirm support and use a tested fallback.
- Compare real output at the intended dimensions; do not choose from theory alone.
Common mistakes include saving photographs as PNG by default, expecting JPG transparency, converting a small raster logo to “SVG” and assuming it can scale cleanly, or choosing a format without checking the final publishing system.
For existing vector artwork, optimise the SVG safely. For format-specific reductions, use the JPEG Optimizer or PNG Optimizer.
Frequently asked questions
Is WebP always smaller than JPG?
No. WebP is often efficient, but source content, dimensions, quality settings and previous encoding determine the actual result. Compare outputs rather than relying on the extension.
Is PNG better quality than JPG?
PNG is lossless and protects exact pixels, while JPG is lossy and usually far more efficient for photographs. Better means suitable for the artwork and use.
Can SVG contain a photograph?
An SVG can embed or reference raster data, but that does not make the photograph vector or resolution independent.
What is the best image format for a website?
There is no single best format. Use SVG for trusted vector assets, WebP or JPG for photographs, and PNG or lossless WebP for graphics requiring transparency or crisp pixels.