About OfflineConvert – Private, Offline Image Converter (No Uploads)
A privacy-first file converter that works entirely in your browser. No uploads, no file storage, complete privacy.
Privacy First
Your files never leave your device. All conversions happen locally in your browser using WebAssembly technology. No uploads, no file storage, complete privacy.
Fast & Efficient
OfflineConvert uses ImageMagick and FFmpeg compiled to WebAssembly for near-native performance — no round-trip latency like cloud-based tools.
No Installation Required
Works directly in your web browser. No software downloads, no installations, no registrations. Just open and convert.
Multiple Formats
Supports PNG, JPG, WebP, AVIF, HEIC, TIFF, GIF, BMP, and more. High-quality conversions with customizable options.
How It Works
Add Your Files
Select or drag & drop your files. Everything stays on your device.
Choose Output Format
Select your desired output format and adjust quality settings.
Convert & Download
Conversion happens in your browser. Download the result instantly.
Technology
OfflineConvert uses WebAssembly versions of trusted image processing libraries:
Ready to Convert Your Files?
Start converting your files now with complete privacy and security.
Start ConvertingFrequently Asked Questions
Yes! Your files never leave your device. All conversions happen locally in your browser using WebAssembly technology. We don't have servers that process your files, so there's no way for us to access or store them.
Absolutely! OfflineConvert supports batch conversion, allowing you to convert multiple images simultaneously. Just select multiple files or drag and drop them all at once.
Yes! Once you've loaded OfflineConvert in your browser, the conversion tools are cached locally. You can convert files even without an internet connection, though you'll need to be online for the initial page load.
OfflineConvert supports all major image formats including PNG, JPG/JPEG, WebP, AVIF, HEIC, TIFF, GIF, BMP, and SVG. You can convert between any of these formats with high quality output.
File size limits depend on your device's available memory (RAM), the image dimensions, complexity, and file type. Since memory usage during conversion varies greatly based on these factors, there's no fixed file size limit. A complex high-resolution image might use more memory than a larger but simpler file. Most modern devices can handle typical image files without issues, but very large or complex files may cause memory limitations on older devices.
OfflineConvert uses the same trusted libraries as professional tools - ImageMagick and FFmpeg compiled to WebAssembly. The quality is identical to desktop applications, often superior to cloud-based converters that compress files for faster uploads.
Yes! You can customize quality levels, dimensions, compression settings, transparency handling, and format-specific options. Each format has tailored controls to give you precise control over the output.
OfflineConvert works on modern mobile browsers, though performance depends on your device's capabilities. Tablets and newer smartphones handle most conversions well, while older devices may struggle with very large files.
Traditional online converters require uploading your file, processing on their servers, then downloading the result. OfflineConvert eliminates upload/download time entirely by processing files directly on your device.
OfflineConvert is built using WebAssembly (WASM) versions of ImageMagick and FFmpeg, running entirely in your browser. This provides the same professional-grade processing capabilities as desktop applications, but without any software installation required.