Image Converter and Resizer
Convert images between JPG, PNG, and WebP. Resize to any dimension.
About this tool
Every platform wants a different image format. Your photographer sends JPGs, your website needs WebP, and your presentation needs PNGs. Tooler's Image Converter handles all the format juggling in one place, plus resizes to exact dimensions.
What is Image Converter and Resizer?
The Image Converter and Resizer is a free online tool that converts images between popular formats (JPG, PNG, WebP, GIF, BMP) and optionally resizes them to a specific width while preserving the aspect ratio. It uses MiniMagick for reliable image processing with proper color space handling.
How to use this tool
- Upload your image — JPG, PNG, WebP, GIF, and BMP formats up to 100 MB are supported.
- Select the output format: JPG (best for photos), PNG (best for graphics/transparency), or WebP (best for web performance).
- Optionally enter a width in pixels to resize — the height adjusts automatically to maintain the original aspect ratio.
- Click 'Convert Image' and download your converted file.
Common use cases
Converting PNG screenshots to JPG for smaller email attachments
Converting photos to WebP format for faster website loading
Resizing product photos to a consistent width for an e-commerce store
Converting images to PNG when you need a transparent background
Reducing photo dimensions for social media profile pictures
Examples
- A 5 MB PNG logo converted to WebP becomes roughly 800 KB — an 85% size reduction with no visible quality loss.
- A 4000px-wide photo resized to 1200px and converted to JPG shrinks from 4 MB to 200 KB — ideal for blog posts.
Tips & best practices
- Use WebP for any image destined for the web — it is 25-35% smaller than JPG/PNG at the same quality and is supported by all modern browsers.
- Always resize images to their display dimensions before uploading to a website. Serving a 4000px image in an 800px container wastes bandwidth.
- JPG does not support transparency — use PNG if you need transparent backgrounds.
- For avatars and profile pictures, resize to exactly the display size the platform uses (e.g., 400×400 for most social media).
Common mistakes to avoid
❌ Converting a photo to PNG — PNG is lossless and produces huge files for photographic content. Use JPG or WebP for photos.
❌ Setting width but forgetting height — the tool maintains the aspect ratio automatically from width, so you only need to enter width.
❌ Repeatedly editing and saving a JPG file — each save at less than 100% quality compounds the quality loss. Keep a lossless master copy.
Frequently Asked Questions
Does resizing crop my image?
No. Resizing adjusts the width while keeping the original aspect ratio. The height is calculated automatically — your image proportions are preserved.
Can I convert multiple images at once?
Currently each file is processed individually. Process files one at a time for the best results.
What image formats do you support?
Input: JPG, PNG, WebP, GIF, BMP. Output: JPG, PNG, WebP. All files must be under 100 MB.
Which format should I use for my website?
WebP is the best choice for web performance — 25-35% smaller than JPG/PNG with the same quality. All modern browsers support it. Use JPG as a fallback for very old browsers.
Will converting from PNG to JPG reduce quality?
Yes, JPG uses lossy compression. For photos, the quality loss is usually imperceptible at reasonable settings. For graphics with text or sharp edges, PNG (lossless) or WebP is a better choice.
Can I convert an image to make its file size larger?
Yes — converting JPG to PNG typically increases file size 5-10× because PNG is lossless and preserves every pixel. Only convert to PNG if you need lossless quality or transparency.
What width should I resize my images to?
1200px is sufficient for most website content areas. 800px works for blog post images. 400px is ideal for profile pictures and avatars. Always match the width to the actual display size on your target platform.
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Privacy and limits
Files are processed on the server and automatically removed after one hour. Do not upload sensitive personal, legal, medical, or confidential business documents unless you accept standard cloud-processing risk. Maximum upload size is 100 MB per file.