How to Convert Image Formats — Complete Guide (2026)
Why You Need to Convert Image Formats
Images come in dozens of formats — PNG, JPG, WebP, HEIC, SVG, BMP, TIFF, AVIF, GIF, and more. Each format has strengths and tradeoffs: some prioritize small file sizes, others preserve perfect quality, and some support features like transparency or animation.
The problem? Not every format works everywhere. iPhone photos (HEIC) won't open on older Windows PCs. WebP images downloaded from websites may not work in your image editor. SVG logos can't be uploaded to most social media platforms. BMP files from legacy systems are far too large for modern use.
Converting image formats lets you use your images anywhere. This guide covers every common conversion, when to use each format, and how to convert for free without uploading your files to any server.The Most Common Image Conversions
PNG to JPG — Reduce File Size
PNG to JPG is the most popular image conversion. PNG files use lossless compression, which preserves every pixel but creates large files — often 2–10 MB for a single photo. JPG uses lossy compression to produce files that are typically 60–80% smaller. When to convert PNG to JPG:HEIC to JPG — iPhone Photo Compatibility
HEIC to JPG solves one of the most common frustrations for iPhone users. Apple uses HEIC (High Efficiency Image Container) as the default photo format because it's 50% smaller than JPG at the same quality. But HEIC has limited compatibility outside the Apple ecosystem. When to convert HEIC to JPG:WebP to PNG — Universal Compatibility
WebP to PNG is essential when you download images from websites. Google's WebP format is increasingly common on the web, but many desktop applications — older Photoshop versions, PowerPoint, email clients — don't support it. When to convert WebP to PNG:SVG to PNG — Vector to Raster
SVG to PNG converts scalable vector graphics into raster images at your chosen resolution. SVG files are mathematical descriptions of shapes and paths, while PNG stores actual pixels. When to convert SVG to PNG:BMP to JPG — Modernize Legacy Images
BMP to JPG converts uncompressed bitmap files to modern, compressed JPG. BMP files are enormous — a single 1920×1080 image is about 6 MB as BMP vs. 200 KB as JPG. When to convert BMP to JPG:Image Format Comparison Table
Here's a quick reference for choosing the right format:
JPG — Lossy compression, no transparency, smallest file size for photos, universally supported. Best for photographs and web images. PNG — Lossless compression, full transparency, larger files. Best for screenshots, logos, graphics with text. WebP — Both lossy and lossless, transparency supported, 25–34% smaller than JPG. Best for modern websites and web optimization. HEIC — HEVC compression, transparency supported, 50% smaller than JPG. Best for iPhone/iPad storage but poor compatibility elsewhere. SVG — Vector format, infinitely scalable, tiny file size for graphics. Best for logos, icons, illustrations. BMP — No compression, no transparency, very large files. Only used in legacy systems. AVIF — AV1 compression, best compression ratio, growing browser support. Best for cutting-edge web performance. GIF — Lossless, 256-color limit, animation support. Best for simple animations and memes. TIFF — Lossless, very large files, print industry standard. Best for professional print workflows.How to Convert Images for Free (Without Uploading)
Most online image converters upload your files to remote servers for processing. This creates privacy risks — your personal photos, screenshots, and documents travel across the internet and sit on someone else's computer.
FormatPic is different. It converts images entirely in your browser using WebAssembly technology. Your files never leave your device. Here's how:Format-Specific Tips
Choosing JPG Quality
JPG quality is set on a 1–100 scale. Here's what the numbers mean in practice:
Preserving Transparency
If your image has a transparent background, your output format must support transparency:
Batch Conversion
Converting many files one at a time is tedious. FormatPic supports batch conversion — select multiple files at once, convert them all simultaneously, and download the results. There are no file count or size limits.
This is particularly useful for:
Frequently Asked Questions
Does image conversion always reduce quality?
Not necessarily. Converting between lossless formats (e.g., BMP → PNG, PNG → WebP lossless) preserves identical quality. Converting from lossy to lossless (e.g., JPG → PNG) preserves the current quality without further degradation. Only converting to a lossy format (e.g., PNG → JPG) introduces some quality reduction, which is controllable via the quality slider.
Which format has the smallest file size?
For photographs: AVIF < WebP < JPG < PNG < BMP (from smallest to largest). For simple graphics and logos: SVG < WebP < PNG. The exact ratios depend on image content and quality settings.
Can I convert images on my phone?
Yes. FormatPic works in any modern mobile browser (Chrome, Safari, Firefox). Visit formatpic.com, select your files, and convert. It works the same as on desktop.
Is it safe to convert images online?
It depends on the tool. Most online converters upload your files to servers, creating privacy risks. FormatPic processes images entirely in your browser — your files never leave your device, making it the safest online converter available.
What happens to EXIF metadata (GPS, camera info) during conversion?
EXIF metadata handling depends on the conversion method. Browser-based tools like FormatPic may strip some metadata during Canvas API processing. If preserving metadata is critical, use a desktop tool like ExifTool alongside your converter.
Quick Links to Converters
*Last updated: April 2026*