Image Format Conversion: PDF, ICO, SVG
JPG vs PNG vs WebP, image-to-PDF, favicon ICO, SVG rasterization and Base64 inlining — one guide for every format need.
Why Convert Image Formats?
Different scenarios demand different formats: the web needs WebP for faster loading, print needs JPG/PNG for quality, development needs SVG/ICO for interfaces, and document archiving needs PDF. Image format conversion is a high-frequency need for designers, developers and office workers alike.
Common Image Formats Compared
| Format | Pros | Cons | Best For |
|---|---|---|---|
| JPG | Small files, rich colors | Lossy compression, no transparency | Photos, large web images |
| PNG | Lossless, transparency support | Larger files | Icons, logos, screenshots |
| WebP | ~30% smaller than JPG, transparency support | Poor legacy-browser support | Modern websites |
| SVG | Vector, infinitely scalable | Not for complex photos | Icons, illustrations, logos |
| GIF | Animation support | 256 colors only | Animated images, memes |
Image to PDF: Document Archiving
Use Cases
- Archiving scanned contracts and invoices
- Submitting multi-page documents in one file
- Organizing academic materials
- Packaging portfolios
How It Works
With the Image to PDF tool you can:
- Merge multiple images into one PDF
- Reorder pages
- Set page size (A4 / original size)
- Control compression quality
PDF is cross-platform and easy to print and archive — the default choice for office scenarios.
Image to ICO: Making a Favicon
Every website needs a favicon (the small icon on the browser tab), and ICO is the standard favicon format.
Steps
- Prepare a square PNG (256×256 recommended)
- Upload it to the Image to ICO tool
- Pick the sizes you need (16/32/48/64/128/256)
- Download the ICO file
- Reference it in HTML: link rel="icon" href="favicon.ico"
Why Multiple Sizes Matter
Different devices need different favicon sizes:
- Browser tabs: 16×16, 32×32
- Desktop shortcuts: 48×48, 64×64
- High-DPI screens: 128×128, 256×256
One ICO file can contain multiple sizes, keeping your site crisp everywhere.
SVG to Image: Vector to Raster
SVG is a vector format, but some scenarios require raster images:
- Embedding in email (some clients don't support SVG)
- Social media sharing
- Legacy system compatibility
- Thumbnail generation
The SVG to Image tool converts SVG to PNG/JPG with custom output dimensions and background color, preserving the clarity of the vector source.
Base64 Inline Images: A Developer Favorite
Base64 encodes an image as a text string that can be inlined directly in HTML/CSS, reducing HTTP requests.
Use Cases
- Inlining small icons into CSS
- Images in email templates
- Single-file HTML apps
- Transmitting image data over APIs
How to Use
The Image to Base64 tool converts in one click and outputs a data URI; reverse decoding back to an image is supported too.
Caveats
- Base64 increases size by about 33%
- Don't inline large images — first-screen loading suffers
- Best for small images under 10KB
- Inlined images can't be cached separately by the browser — weigh the trade-off
Format Cheat Sheet
- Photo sharing → JPG / WebP
- Transparent icons → PNG / WebP
- Website favicon → ICO
- Vector graphics → SVG
- Animation → GIF
- Document archiving → PDF
- Development inlining → Base64
Conclusion
Understanding image format characteristics and conversion methods is a basic skill for digital content creation. With free online tools you can handle every format conversion in the browser — no professional software, and images are never uploaded.
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