Image Converter
Convert images between JPG, PNG, WebP, BMP, GIF, TIFF.
Drag & Drop Images Here
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Upload one image or multiple images at once.
Lower quality = smaller files · Higher quality = better image quality
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Convert images between any common format — JPG, PNG, WebP, BMP, GIF, TIFF, and HEIC (browser-supported). Adjust output quality for lossy formats, handle transparency when converting from PNG, and batch convert multiple files at once. Download individual converted images or get them all as a ZIP archive. The conversion happens entirely in your browser using Canvas API, so your images never leave your device.
Why Use Our Image Converter
6+ Formats
Convert between JPG, PNG, WebP, BMP, GIF, TIFF, and HEIC with one tool.
Instant Conversion
Convert images in milliseconds using the Canvas API. No server uploads or waiting.
Quality Control
Adjust output quality with a slider. Balance file size and visual quality for your needs.
100% Private
All processing happens in your browser. Your images never leave your device.
Batch Conversion
Convert multiple images at once and download them all as a ZIP archive.
Unlimited & Free
No daily limits, no watermarks, no account required. Convert as many images as you need.
What is an Image Converter?
An image converter is a tool that transforms digital images from one file format to another. Every digital image is stored using a specific encoding method — called a format — that determines how pixel data, color information, and metadata are compressed and structured. The most common formats you encounter daily are JPEG (for photos), PNG (for graphics with transparency), and WebP (a modern format designed for faster web loading).
Conversion is necessary because different platforms, applications, and workflows require specific formats. An iPhone saves photos as HEIC, but many websites only accept JPEG or PNG. A designer needs PNG with transparency for a logo, but the client wants a JPG for email. A web developer wants WebP for faster page loads, but the source images are all PNG. An image converter solves these compatibility problems by re-encoding the image data into the target format.
Our converter works entirely in your browser using the HTML Canvas API. The image is loaded into a canvas element, then exported using the toBlob() method with the target MIME type. No data is sent to any server — the entire process happens on your device.
How Image Conversion Works
When you convert an image, the browser follows a precise sequence of steps. First, the original file is decoded — the browser reads the compressed data and reconstructs the full pixel array in memory. Each pixel is represented as RGBA values (Red, Green, Blue, Alpha/transparency). This decoded data is then drawn onto an HTML Canvas element, which acts as a programmable drawing surface.
The canvas then exports the image using canvas.toBlob(callback, mimeType, quality). The browser's built-in encoder re-compresses the pixel data into the target format. For lossy formats like JPEG and WebP, the quality parameter (0–1) controls how aggressively data is discarded. For lossless formats like PNG, every pixel is preserved exactly but the file is larger.
The MIME type tells the browser which encoder to use: image/jpeg for JPG, image/png for PNG, image/webp for WebP, and so on. The browser handles all the complex compression mathematics — you just select the format and quality.
Image Format Comparison
| Format | Compression | Transparency | Animation | Best Use | Typical Size |
|---|---|---|---|---|---|
| JPEG | Lossy | No | No | Photos, social media, web | Small (50–200 KB) |
| PNG | Lossless | Yes (alpha) | Yes (APNG) | Logos, screenshots, graphics | Medium (100–500 KB) |
| WebP | Both | Yes (alpha) | Yes | Modern web, fastest loading | Smallest (30–150 KB) |
| GIF | Lossless (256 colors) | Yes (1-bit) | Yes | Simple animations, icons | Variable |
| BMP | None (uncompressed) | No | No | Legacy systems, raw data | Very large |
| TIFF | Lossless or lossy | Yes | No | Print, archival, professional | Large (1–10 MB) |
| HEIC | Lossy (HEVC) | Yes | No | iPhone photos, Apple devices | Small (similar to JPEG) |
When Should You Convert Images?
Website Optimization
Convert PNG screenshots to JPG or WebP for 50–80% smaller files. Faster page loads improve SEO and user experience.
Email Attachments
Convert large PNGs to JPG to stay under attachment size limits. A 5MB PNG can become a 500KB JPG.
Social Media Uploads
Platforms like Instagram and Facebook re-convert uploads. Uploading pre-converted JPG/WebP reduces double compression.
Printing
Convert web images to TIFF or high-quality PNG for print. These lossless formats preserve every detail.
Graphic Design
Designers need PNG with transparency for logos and overlays. Convert JPG photos to PNG when adding transparent elements.
E-commerce
Product photos benefit from WebP format — smaller files load faster, improving conversion rates.
iPhone Photo Sharing
HEIC photos from iPhones may not display on Windows or older devices. Convert to JPG for universal compatibility.
Archive & Backup
Convert to PNG or TIFF for lossless archival. These formats preserve original quality without degradation.
Best Image Format for Every Situation
| Need | Recommended Format | Why |
|---|---|---|
| Website photos | WebP or JPEG | Best compression, fast loading |
| Logos | PNG or SVG | Lossless quality, sharp edges preserved |
| Transparent graphics | PNG or WebP | Alpha channel support for overlays |
| TIFF or PNG | Lossless, no compression artifacts | |
| Animation | GIF or WebP | Frame-by-frame animation support |
| iPhone photos | JPG or WebP | Universal compatibility, small files |
| Screenshots | PNG | Lossless, text stays crisp and readable |
| Documents | PDF (via JPG/PNG) | Universal viewing, consistent layout |
PNG vs JPG vs WebP: Detailed Comparison
JPEG (JPG)
- • Lossy compression — discards data for smaller files
- • No transparency support
- • Best for: photographs, social media, web
- • Quality degrades with repeated saves
- • Universal compatibility — works everywhere
PNG
- • Lossless compression — preserves every pixel
- • Full alpha transparency support
- • Best for: logos, screenshots, graphics
- • Larger files than JPEG for photos
- • Supports animation (APNG)
WebP
- • Both lossy and lossless modes
- • Alpha transparency support
- • Best for: web, modern browsers, fastest loading
- • 25–35% smaller than JPEG at same quality
- • Supported by all modern browsers
Quality vs File Size
The quality slider controls how much data is discarded during lossy compression. Here's what to expect at different quality levels:
Transparency Explained
Transparency allows parts of an image to be see-through, revealing whatever is behind it. This is essential for logos, overlays, watermarks, and any graphic that needs to sit on top of different backgrounds. Each pixel can have an alpha value (0 = fully transparent, 255 = fully opaque) that controls its visibility.
Formats That Support Transparency
- ✓ PNG — full alpha channel (smooth edges)
- ✓ WebP — full alpha channel
- ✓ GIF — 1-bit transparency (on/off only)
- ✓ TIFF — alpha channel support
What Happens When You Convert to JPG
- ⚠ JPEG has no transparency support
- ⚠ Transparent areas become white (by default)
- ⚠ Semi-transparent edges get white fringing
- ⚠ Convert to WebP instead to preserve transparency
HEIC Support: iPhone Photos Explained
HEIC (High Efficiency Image Container) is the default photo format on iPhones and iPads since iOS 11. It uses the HEVC (H.265) compression algorithm to produce files that are roughly 50% smaller than JPEG at comparable quality. While this saves storage space on your device, HEIC files are not universally supported — Windows computers, many websites, and older devices may not display them correctly.
Our converter accepts HEIC input on modern browsers (Safari, Chrome 107+, Edge 107+). Simply drag and drop your iPhone photos and convert them to JPG, PNG, or WebP for universal compatibility. The conversion preserves the full resolution and quality of the original image.
Tips for Better Image Conversion
Use WebP for web images
WebP offers 25–35% smaller files than JPEG at equivalent quality. It is supported by all modern browsers and is the recommended format for website images.
Convert PNG to JPG when transparency is not needed
PNG files are significantly larger than JPG. If your image has no transparent areas, converting to JPG can reduce file size by 50–80%.
Keep quality at 90%+ for photos
Quality settings above 90% produce visually identical results to the original. Going below 80% may introduce visible artifacts in smooth gradients.
Use PNG for screenshots and text
PNG's lossless compression keeps text crisp and sharp. JPEG compression can make text blurry and hard to read.
Convert HEIC to JPG for sharing
iPhone HEIC photos may not display on Windows or older devices. Convert to JPG before sharing with non-Apple users.
Batch convert for consistency
When preparing images for a gallery or product listing, convert all images to the same format and quality for a uniform appearance.
Check the output before downloading
After conversion, compare the file sizes. If the output is unexpectedly large or small, adjust the quality slider and convert again.
Use TIFF for print output
When sending images to a printer or design tool, convert to TIFF for lossless quality that preserves every detail.
Common Conversion Mistakes
Converting logos to JPG
Logos have sharp edges and often need transparency. Use PNG to preserve quality and transparency.
Using PNG for photographs
PNG produces much larger files than JPG for photos. Use JPG or WebP for photographic content.
Using TIFF for websites
TIFF files are very large and not supported by browsers. Convert to JPG, PNG, or WebP for web use.
Ignoring quality settings
The default quality (92%) works well for most cases, but always check if a lower setting produces acceptable results for your use case.
Converting already-compressed images repeatedly
Each lossy conversion degrades quality. Always convert from the original source, not from a previously compressed version.
Not checking transparency before JPG conversion
If your PNG has transparent areas, they will become white when converted to JPG. Check the warning notice in the tool.
Privacy and Security
Your images are processed entirely within your web browser using the HTML Canvas API. No data is sent to any server. This means:
- ✓ Images never leave your device — all conversion happens locally
- ✓ No account, login, or email required
- ✓ No data collection, tracking, or analytics on your content
- ✓ Works offline after initial page load
- ✓ All data is cleared when you close the browser tab
Features
How to Convert Images
Upload Your Images
Drag and drop images into the upload area, click to browse, or paste from clipboard. Supported formats: JPG, PNG, WebP, BMP, GIF, TIFF, and HEIC.
Choose Output Format
Select the target format from the dropdown. Consider your use case: WebP for web, JPG for photos, PNG for graphics with transparency.
Adjust Quality
Use the quality slider (1–100%) for lossy formats like JPG and WebP. The default 92% works well for most purposes. Higher quality = larger files.
Convert
Click "Convert All" to process your images. The conversion happens instantly in your browser using the Canvas API.
Download
Download individual converted images or get them all as a ZIP archive. Check the file size comparison to see how much space you saved.
Frequently Asked Questions
Which format is best for web images?
Does conversion reduce image quality?
Can I convert HEIC images from my iPhone?
Can I convert multiple images at once?
Is WebP supported in all browsers?
Will transparency be preserved?
Can I convert GIF images?
Does this work offline?
Is there a file size limit?
Can I convert images on mobile?
What is the difference between lossy and lossless?
Why is my converted file larger than the original?
Can I convert PNG to WebP?
Does the tool add watermarks?
Is there a daily limit?
Related Image Tools
What is Image Converter
Image Converter transforms images between common formats — JPG, PNG, WebP, BMP, GIF, TIFF, and HEIC (browser-supported). It provides quality selection for lossy formats, handles transparency when converting from PNG, and supports batch conversion with individual or ZIP download. The conversion uses Canvas API to re-encode the image in the target format.
How it Works
The tool loads the image into a Canvas element and exports it using the toBlob method with the target MIME type and quality parameter. For formats that do not support transparency (JPG), transparent areas become white. WebP offers better compression than JPG at similar quality. The batch mode processes multiple files sequentially and bundles results into a ZIP archive using JSZip.
When to Use It
Use Image Converter when converting PNG screenshots to smaller JPGs for web, creating WebP versions for faster page loads, converting HEIC photos from iPhone to universally supported formats, preparing images for platforms that only accept specific formats, or converting between formats for compatibility with design tools.
Tips and Best Practices
Use WebP for web images — it offers 25-35% smaller files than JPG at similar quality. Convert PNG to JPG when transparency is not needed for significant size reduction. Always check the output quality for lossy conversions.
Privacy Guarantee
Image Converter processes everything in your browser. Your files never leave your device and are never uploaded to any server. When you close the tab, all data disappears. No logs, no storage, no tracking of your content.