stars PixLab | Convert Box

PixLab Convert Box browser-based file converter

Convert Files Faster, Securely & Locally with Convert Box

Convert common image, audio, and video formats such as JPG, PNG, WEBP, FLAC, MP4, and MP3 with Convert Box. Every conversion runs locally in your browser, so your files stay on your device and never need to be uploaded to a remote server.

All Formats
image Images
play [#1003] Created with Sketch. Videos
Audio

Convert files privately in your browser with presets, audio trimming, ZIP downloads, and offline-ready caching.

Key Features & Benefits

Secure and private conversion

Secure & Private

All files stay on your device during conversion—no transfers to external servers. Feel at ease knowing your data is never exposed.

Extensive format support
Extensive Format Support
Convert everyday image, audio, and video formats in one place, from JPG to PNG to MP4-to-MP3 extraction workflows and more.
Batch conversion

Batch Conversion

Save time by converting multiple files in one batch, then download everything at once as a ZIP archive.
No installation required

No Installation Required

Use Convert Box right in your browser. Eliminate the need for clunky software, plug-ins, or device-specific downloads.

How to use Convert Box?

1
Select Your Files
Drag and drop one or more files directly into the Convert Box window, or click the "Add Files" button to browse your local storage.
2
Choose Your Conversion Format
A menu will appear prompting you to choose a compatible output format for each file, such as PNG, MP3, MP4, WEBM, or WAV.
3
Review the Queue (Optional)
Before converting, review each selected file, change its target format if needed, open per-format settings, apply compression presets, or remove anything you no longer want in the batch.
4
Click "Convert"
Hit the "Convert" button to start the process. Since everything runs locally in your browser, there's no waiting for online servers.
5
Download The Converted Files
Once the conversion is done, your transformed files are immediately available to download individually or together as a ZIP file, all while staying on your device.
Convert Box batch conversion illustration

Frequently Asked Questions

Yes, Convert Box is 100% free. You can convert as many files as you need without any hidden fees or subscription costs.

No. Convert Box runs entirely in your browser. There is no need to install software or plugins on your computer.

Absolutely. All file conversions happen locally in your browser. Your files never leave your device, ensuring the highest level of privacy and security.

Convert Box currently supports a focused set of image, audio, and video formats such as JPG, PNG, WEBP, MP3, WAV, MP4, WEBM, MOV, AVI, MKV, WMV, and FLV.

Yes. The batch conversion feature lets you drag and drop several files so you can convert them in one run.

We strive to cover every major and many niche formats. If you encounter a format that isn’t supported, please let us know so we can add it in a future update.

Conversion speed varies depending on file size and your device’s performance, but local conversion ensures the process is typically much faster than online converters.

Most modern browsers allow handling of large files without issue. However, extremely large files may be constrained by your device’s processing power and available memory.