Image Format Changer (Web-Only): Free, Offline & Portable Image Converter

If you want a fast, distraction-free way to convert images in bulk, the new Image Format Changer is a simple, portable app that runs fully offline in your web browser. It converts to JPG/PNG/WEBP/AVIF/BMP, supports optional resizing, and has an advanced rename pattern ({name}, {n}, {ext}), and can optionally keep EXIF for JPEG→JPEG (when not resizing) — all without any installation or logins.

What is Image Format Changer?

Image Format Changer is a lightweight, browser-based utility that opens from a single HTML file. It works on Windows, macOS, and Linux in Chrome or Edge. The interface is clean and beginner-friendly, and everything — conversions, settings, and file operations — stays on your device for privacy.

Why would you use it?

Because it’s private, portable, and fast. You can drag & drop a folder of photos, pick a target format (JPG/PNG/WEBP/AVIF/BMP), set an optional size cap, choose a background for transparent PNG → JPG, and convert everything at once. The rename pattern lets you standardize file names (great for sharing or archiving), and the optional EXIF keep (JPEG→JPEG, no resize) preserves important metadata.

Main Features of Image Format Changer

• Works fully offline: open the HTML, convert — no internet needed.
• Bulk Convert: convert all loaded images in one click.
• Save All to a Folder: export everything at once (File System Access API).
• Per-file Download: grab individual outputs if you prefer.
• Rename Pattern: {name} (original), {n} (counter), {ext} (output ext) with configurable start & padding.
• Optional Keep EXIF: JPEG→JPEG (when not resizing) re-inserts original EXIF.
• Resize if needed: set Max Width/Height — aspect ratio is preserved.
• Background for JPEG: choose White/Black when converting transparent images to JPG.
• Dark Mode: easy on the eyes.
• Formats: JPG, PNG, WEBP, AVIF, BMP (encode support depends on your browser).

How to Use Image Format Changer

1. Download & Extract the ZIP (link below).
2. Open Image-Format-Changer.html in Chrome or Edge.
3. Drag & Drop images (or use Choose Files).
4. Pick an Output Format (JPG/PNG/WEBP/AVIF/BMP) and Quality (for lossy formats).
5. (Optional) Set Max Width/Height to resize; leave 0 to keep original size.
6. (Optional) Toggle Keep EXIF (only JPEG→JPEG when not resizing).
7. (Optional) Set a Rename Pattern:
   • {name} = original filename (without extension)
   • {n} = running counter (start & digits are configurable)
   • {ext} = output extension (add it explicitly or it’s appended automatically)
8. Click Convert All.
9. Click Save All to choose a folder, or use per-file Download.

Safe Use Tips

• Transparent → JPEG? Pick a White or Black background to avoid checkerboard patterns.
• Quality vs Size: lower quality reduces file size; start at ~0.85 for WEBP/JPG, then adjust.
• Resizing: set either Max Width or Max Height (or both). The tool maintains the aspect ratio.
• Browser support: Chrome/Edge have the best encoding support for WEBP/AVIF.

When This Tool Helps

• Batch sharing: convert huge camera PNGs/HEIC to lightweight JPG or WEBP.
• Uploads: meet format or size limits for portals and forms.
• Archiving: standardize names and formats for long-term storage.
• Privacy: do everything locally without uploading photos anywhere.

Pros and Considerations

Pros: fully offline; bulk convert; folder save; flexible rename pattern; optional EXIF keep; dark mode.

Considerations: metadata is typically stripped during re-encode (except JPEG→JPEG with EXIF keep and no resize); encode support for AVIF/WEBP depends on the browser.

Download Image Format Changer

Direct Download (ZIP):

• File name: Image-Format-Changer-WebOnly-Final.zip
• Version: 1.0
• Size: 6.6 KB
• OS: Windows 11/10, macOS, Linux (Chrome/Edge recommended)
• License: Freeware
• Last updated: August 26, 2025
• SHA-256: e6f602b693786fb48d6451587d1a60f21840d12858ab9e585ddf690f16816a39

Frequently Asked Questions

Does it need installation?

No. It’s a portable HTML app. Extract the ZIP and open the HTML file in your browser.

Will it work without internet?

Yes. The entire app runs offline; conversions happen locally in your browser.

Where are my images processed?

Locally, via the browser’s Canvas and File APIs. Nothing is uploaded.

Can it keep EXIF?

Yes, when converting JPEG→JPEG without resizing. Other conversions typically strip metadata.

Which browsers are supported?

Chrome and Edge are recommended for best encoding support (WEBP/AVIF). Most features also work in other Chromium-based browsers.

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Conclusion

Image Format Changer (Web-Only) gives you a clean, fast, and private way to convert images in bulk. With offline operation, flexible rename rules, optional EXIF keep, and folder-save, it’s ideal for photographers, students, and anyone who needs quick, trustworthy conversions without installing anything. Keep it on a USB drive, use it anywhere, and standardize your image libraries in minutes.