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Image Converter

Online Image Format Converter - Free PNG/JPG/WebP/Base64 Conversion - Tool3M

Image Converter guide

Image Converter Description

Online Image Format Converter - Private Browser Processing

Features

Supported output formats: Export to PNG, JPG, WebP, GIF, SVG, or Base64.
Base64 mode: Paste a Base64 image string and convert it back to a downloadable image, or turn an uploaded image into a data URL.
Client-side processing: All conversions happen in your browser, so the file stays on your device.
Simple web workflow: Convert screenshots, photos, icons, SVG previews, and small inline assets without installing desktop software.

How to Use

1
Converting your images is simple and intuitive:
2
Select your input: Choose an image file or switch to Base64 mode and paste a data URL.
3
Choose output format: Select PNG, JPG, WebP, GIF, SVG, or Base64.
4
Convert: Click the conversion button. The browser decodes the source and prepares the result locally.
5
Download or copy: Download the image file or copy the generated Base64 string.

Overview

The Image Converter turns browser-readable images into PNG, JPG, WebP, GIF, SVG, or Base64 output. It is built for quick web, documentation, and development workflows where you need local conversion without uploading a private image to a remote service.

All processing happens in the browser with standard APIs such as Image, canvas, FileReader, and object URLs. Your "upload" is only a local file selection in the current tab.

Format Boundaries

Input support depends on what the current browser can decode. PNG, JPG, GIF, WebP, and SVG are broadly supported in modern browsers. AVIF input may work in browsers with AVIF decoding enabled, but this tool does not expose AVIF as an output format. HEIC is not a dependable browser-native input format and is not listed as a supported target.

Use Cases

1. Web Performance Optimization

Web developers often need to convert bulky PNG or JPG files into WebP. WebP can reduce page weight while preserving acceptable visual quality.

2. Cross-Platform Compatibility

When a browser can decode a source image, the converter can export it to widely compatible JPG or PNG files. HEIC support is intentionally not promised because most browsers do not expose dependable native HEIC decoding.

3. Developer Workflows

When building small websites or email templates, developers often use Base64 encoding to embed icons or small images directly into code. This reduces the number of HTTP requests, speeding up the site. Our tool makes this conversion seamless.

4. Graphic Design & Social Media

SVG files are great for logos, but many social media platforms require raster formats like PNG. Use our tool to convert your vector logos into high-quality PNGs with transparent backgrounds.

Technical Background

The Tool3M Image Converter uses browser technologies already present in the page:

  • Canvas API: The decoded image is drawn to a canvas and exported with the requested MIME type.
  • FileReader: Base64 output is generated with FileReader.readAsDataURL.
  • Object URLs: Download previews are created from local blob URLs.
  • Local Privacy: Because the logic runs in your browser, your data is never sent to our servers. Your "upload" is actually just loading a file into your computer's RAM.

Q: Is it safe to convert my private photos here?

A: Yes, 100%. Unlike other websites, we do not upload your images to any server. All processing happens locally on your computer. Once you close the tab, no trace of your image remains on our end.

Q: Why should I use WebP instead of JPG?

A: WebP typically provides 25-35% smaller file sizes than JPG for the same visual quality. It also supports transparency (like PNG) and animation (like GIF), making it a versatile "all-in-one" format for the web.

Q: Does this tool support HEIC or AVIF?

A: AVIF input depends on whether your browser can decode AVIF images. HEIC is not listed as a supported output or dependable input format. The target formats exposed by the tool are PNG, JPG, WebP, and Base64.

Q: Will I lose quality when converting?

A: Converting between "lossy" formats (like JPG to WebP) can involve some quality loss, though it's often imperceptible to the human eye. Converting to "lossless" formats (like to PNG) preserves every pixel perfectly.

Q: Is there a file size limit?

A: The limit is generally determined by your device's available RAM. Most modern computers and smartphones can easily handle images up to 50MB or more.

Limitations

While our tool is powerful, there are a few technical limitations to keep in mind:

  • Browser Resources: Since conversion happens locally, very large images (e.g., 100MP+ professional RAW files) might slow down your browser or cause it to run out of memory.
  • SVG Complexity: Extremely complex SVG files with heavy filters or external dependencies might render differently than they do in dedicated vector software like Adobe Illustrator.
  • Batch Processing: While we support quick sequential conversions, extremely large batches of hundreds of files may be more efficiently handled by desktop command-line tools.
  • Browser Support: Ancient browsers (like Internet Explorer) do not support the modern technologies (WASM, Canvas) required for this tool to function. We recommend using the latest version of Chrome, Edge, Firefox, or Safari.
3M

Reviewed by Tool3M Editorial Team

Updated April 25, 2026

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