Convert images to JPEG, PNG, WebP, or BMP – locally in your browser
Click to upload images or drag & drop
Supports JPG, PNG, GIF, BMP, WebP (multiple)
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Founder & CEO, Toolraxy
Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.
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The Image Format Converter is a free, browser‑based tool that lets you change your images from one format to another—JPEG, PNG, WebP, or BMP—without uploading them to any server. Whether you’re a web designer optimizing images for faster load times, a photographer preparing files for clients, or someone who just needs a PNG turned into a JPEG for a document, this tool handles it in seconds. Simply drag and drop your image, select the desired output format, and adjust the quality slider for JPEG or WebP to balance file size and clarity. Everything happens locally on your device, ensuring your images remain private. At Toolraxy, we believe in providing simple, transparent, and powerful utilities that respect your privacy. Convert images confidently, right in your browser.
Upload your image – Click the upload area or drag & drop any image (JPG, PNG, GIF, BMP, WebP) into the converter panel.
Choose output format – From the dropdown, select the format you need: JPEG, PNG, WebP, or BMP.
Adjust quality (if needed) – For JPEG and WebP, move the slider to set quality (0–100%). Higher quality = larger file; lower quality = smaller file but possible loss of clarity.
View conversion stats – Once loaded, the tool automatically converts your image and displays the new format, file size, and dimensions in the result section.
Download your converted image – Click the red “Download Converted Image” button to save the file to your device.
(Optional) Copy Data URL – Advanced users can click “Copy Data URL” to get the base64 representation of the converted image.
The tool uses your browser’s built‑in Canvas API to perform the conversion entirely on your device. Here’s the step‑by‑step logic:
Image loading – When you upload an image, it is read as a data URL and loaded into an HTML Image object.
Canvas drawing – After the image is fully loaded, it is drawn onto an off‑screen <canvas> element at its original dimensions (width and height are preserved).
Export with selected format – The canvas is then exported using the .toBlob() method, which takes two parameters:
Format MIME type – selected from the dropdown (image/jpeg, image/png, image/webp, image/bmp).
Quality factor – for lossy formats (JPEG, WebP), a number between 0 and 1 determines compression level. For PNG and BMP, quality is ignored (they are lossless/uncompressed).
Resulting blob – The browser’s image encoder creates a new Blob representing the image in the chosen format. The tool then generates a downloadable link and displays the file size and dimensions.
Client‑side only – No data is sent to any server; all processing stays within your browser tab, guaranteeing privacy and speed.
If the selected format is not supported by the browser (e.g., BMP in some older browsers), conversion may fail and an alert is shown.
Original image dimensions are always preserved – the tool does not resize images.
For PNG and BMP, the quality slider has no effect
Imagine you have a screenshot saved as screenshot.png that is 1.2 MB and has dimensions 1920×1080 pixels. You want to upload it to a website that prefers JPEGs for photographs.
Step 1 – Drag and drop screenshot.png into the converter. The preview shows the image, and the file info displays “1.2 MB · 1920 x 1080”.
Step 2 – From the output format dropdown, select JPEG (.jpg).
Step 3 – Move the quality slider to 75% (quality factor 0.75). This will reduce file size while maintaining acceptable visual quality for web use.
Step 4 – The tool automatically converts the image. In the result section you see:
Format: JPEG
Size: 240 KB (significantly smaller than the original PNG)
Dimensions: 1920 x 1080 (unchanged)
Step 5 – Click “Download Converted Image” and save converted.jpg to your computer.
Takeaway – By converting from PNG to JPEG at 75% quality, you reduced the file size by about 80%, making the image much faster to load on a web page while preserving the original dimensions.
An image format converter changes an image file from one type (like PNG) to another (like JPEG). This is important because different formats serve different purposes. JPEG is ideal for photographs due to its compression; PNG is best for graphics with transparency; WebP offers modern compression with transparency support; and BMP is an uncompressed format often used in specialized applications. Using the right format can reduce file size, improve load times, and ensure compatibility with software or websites.
While you can use software like Photoshop or GIMP, an online converter simplifies the process. With our tool, you don’t need to install anything. The manual process in software typically involves opening the image, selecting “Save As” or “Export”, and choosing the format. Our tool automates this with a few clicks, and because it runs in your browser, you don’t have to worry about uploads or privacy.
The best format depends on the image content. For photos, JPEG with moderate compression (60–80% quality) offers a good balance between quality and file size. For logos, icons, or images with text, PNG is preferred because it preserves sharp edges and supports transparency. WebP is becoming popular because it can do both: lossy compression similar to JPEG but with smaller files, and lossless compression with transparency like PNG. BMP is rarely used on the web due to its large file size.
The quality slider in our tool controls compression for JPEG and WebP. A higher quality (e.g., 90%) retains more detail but results in a larger file. Lower quality (e.g., 50%) discards some image data, which can introduce artifacts like blurriness or blockiness, but significantly reduces file size. For most web uses, a quality setting between 70% and 85% is recommended – it keeps images looking good while saving bandwidth.
Several factors influence output file size:
Original dimensions – Larger images produce larger files, even after conversion.
Format – JPEG and WebP compress efficiently; PNG is lossless and can be larger; BMP is uncompressed and huge.
Quality setting – Lower quality reduces file size for JPEG and WebP.
Image complexity – A photo with many details compresses differently than a simple logo.
This can happen if you convert a highly compressed JPEG to a lossless format like PNG or BMP. For example, a 100 KB JPEG might become a 500 KB PNG because PNG preserves all pixel data without the losses JPEG introduced. Also, converting from PNG to JPEG might increase size if the original PNG was already small and you choose a high JPEG quality. Always consider the format’s characteristics.
You should use a converter when:
You need to upload an image to a website that only accepts certain formats.
You want to reduce file size for email or storage.
You need a transparent background (PNG or WebP) instead of a JPEG.
You’re preparing images for print (BMP might be used in some workflows).
You want to future‑proof images by converting to WebP for better performance.
Over‑compressing JPEGs – Setting quality too low can make images unusable. Always preview before downloading.
Using PNG for photos – PNG files for photographs are often unnecessarily large. JPEG is more suitable.
Ignoring transparency – If your image has transparency, converting to JPEG will fill transparent areas with a solid color (usually white), ruining the effect.
Not checking dimensions – Some converters resize images; ours preserves original dimensions, so you may need to resize separately.
Consider a small business owner who needs to upload product photos to an e‑commerce platform. The platform recommends JPEG format with a maximum file size of 500 KB. The owner takes photos with a smartphone, which saves them as high‑quality JPEGs around 3 MB. Using our converter, they can upload each photo, select JPEG format, and lower the quality until the file size drops below 500 KB. They can see the file size instantly and download the optimized images without ever uploading them to a server – keeping product images private.
Saves time – No need to open heavy software; convert in seconds.
Reduces manual errors – Automatic conversion ensures correct format.
Instant results – See file size and dimensions immediately.
Free – No subscriptions or hidden fees.
Private – All processing happens locally in your browser; images never leave your device.
Accessible on any device – Works on desktop, tablet, and mobile.
User‑focused – Simple interface with clear options.
It uses your browser’s native image encoding, the same technology behind major browsers. Conversion is pixel‑perfect for lossless formats and follows your exact quality settings for JPEG/WebP.
Only if you choose a lower quality for JPEG or WebP. PNG and BMP conversions preserve all original data. You control the quality with the slider.
JPEG is a lossy format optimized for photographs, offering small file sizes at the cost of some detail. PNG is lossless, preserving every pixel – ideal for graphics, text, and images needing transparency.
BMP is an uncompressed format, storing raw pixel data without compression. This results in very large files but ensures no quality loss.
Absolutely. Upload the WebP image, select JPEG as output, and download. The tool handles all supported combinations.
Modern browsers support JPEG, PNG, and WebP widely. BMP support may vary; if conversion fails, you’ll see an alert. Try converting to another format.
File size depends on image content and compression. For example, a photo with many details may not compress as much as a simple graphic, even at the same quality setting.
Simply upload any image, select “WebP (.webp)” from the format dropdown, and download. You can also adjust quality if desired.
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