What file formats do you support?

We support over 100 file formats including images (JPG, PNG, GIF, WebP, TIFF), documents (PDF, DOC, DOCX, TXT), videos (MP4, AVI, MOV), audio (MP3, WAV, FLAC), and many more specialized formats.

Yes, absolutely. We use enterprise-grade encryption for all file transfers. Your files are automatically deleted from our servers after conversion, and we never store or access your personal data.

What is the maximum file size?

The maximum file size for free users is 100MB per file. Premium users can convert files up to 1GB. For larger files, we recommend our batch processing feature.

How long does conversion take?

Most files convert in under 30 seconds. The exact time depends on file size and format complexity. Our advanced algorithms ensure the fastest possible conversion while maintaining quality.

Can I convert multiple files at once?

Yes! Our batch processing feature allows you to upload and convert up to 50 files simultaneously. This is perfect for bulk conversions and saves significant time.

Do I need to create an account?

No account is required for basic conversions. However, creating a free account gives you access to batch processing, file history, and priority support.

JBG to ICO

Drag, drop, and convert your files with ease.

1. Add Your Files

Drag & drop or paste files here

JBG (Max. 10MB) • Up to 5 files in guest mode

Choose Files

Or upload from:

Temporary file processingFiles are uploaded for processing and are not retained as permanent storage. Read our File Processing & Retention Policy.

2. Conversion Settings

Convert From

Convert To

Image options

Width (px)

Height (px)

Strip image metadata (EXIF, etc.)

Advanced Options

Quality

Instant download after conversion

Why Choose Our Converter?

Convert legacy JBG raster images into ICO icons reliably for professional Windows and cross-platform icon workflows.

Fast Single-File Conversion

Convert individual JBG files to ICO quickly with low latency for rapid iterative icon editing.

Controlled Raster Output

Produces pixel-accurate ICO frames from JBG raster data, minimizing resampling artifacts when resizing.

Windows & App Compatibility

Generates ICO containers compatible with Windows Explorer, taskbars, and many app resource loaders.

Batch Icon Packs

Process multiple JBG images into multi-resolution ICO files for consistent icon sets across sizes.

Custom Size Targets

Select standard ICO sizes (16–256 px) or define custom pixel dimensions before conversion.

Client-Side Processing Option

ConvertXLab supports local in-browser conversion to reduce server transfers when privacy is required.

Frequently Asked Questions

Find answers to common questions about our file conversion service

Still have questions?

Can't find the answer you're looking for? Our support team is here to help.

Performance Estimates

Estimated conversion times based on typical hardware.

Conversion Speed Benchmarks

1-3 seconds

12 MP image processing

12 MP, 4000x3000

Fast

3-6 seconds

24 MP image processing

24 MP, 6000x4000

Moderate

8-15 seconds

48 MP image processing

48 MP, 8000x6000

Slow

Batch Conversion Estimates

Batch Size	Total Time	Avg per Image	Efficiency
10 images (12 MP each)	20-40 seconds	2-4 seconds	High
50 images (12 MP each)	1.5-3 minutes	1.8-3.6 seconds	High
100 images (12 MP each)	3-6 minutes	1.8-3.6 seconds	Moderate
200 images (12 MP each)	6-12 minutes	1.8-3.6 seconds	Moderate

Browser Compatibility

Format support across all major browsers

Support Across Browsers

Chrome

Supported

Full Support

Firefox

Supported

Full Support

Safari

Supported

Full Support

Edge

Supported

Full Support

Advanced Format Features Support

Features	Chrome	Firefox	Safari	Edge
Alpha Channel
ICC Profiles
EXIF Metadata
16-bit Depth

Device Compatibility

Seamless conversion across desktop, mobile and tablet

Desktop

Fast multi-core processing
Batch upload support

Mobile

Responsive mobile browser workflow
Instant photo conversion

Tablet

Full tablet browser support
Touch-friendly interface

Source vs Target Format

Key technical differences between formats

Feature	Source Format	Target Format
Compression	High efficiency	Uncompressed
File Size	Small	Large
Quality	High (compressed)	Lossless
Transparency	Supported	Supported
Metadata	EXIF, ICC	EXIF, ICC
Primary Use	Web delivery	Editing & print

How to Convert Files

Follow these simple steps to convert your files

Upload Source File

Select or drag and drop your source files.

Adjust Settings

Choose resolution or color options if needed.

Convert

Click convert to process files locally in browser.

Download Result

Save your converted files or ZIP archive.

Ready to Convert Your Files?

Use our high-speed converter to process your images now.

Start Converting Now

Tips and Best Practices

Optimize your conversion workflow with technical recommendations.

Prepare JBG Source Scans

Deskew scanned JBG images to preserve edge alignment when rasterized into ICO frames
Despeckle or denoise JBIG scans to avoid artifacts becoming visible at icon sizes
Increase contrast on bi-level JBIG before scaling to maintain glyph clarity at 16–32 px
If JBG is grayscale, convert to 8-bit grayscale then map to RGB to control tonal expansion
Split multi-page JBIG outside the converter so each page becomes a separate ICO frame

Target ICO Encoding Choices

Choose PNG-backed ICO frames when you need alpha synthesized from JBG thresholds
Select 32-bit RGBA output if you require semi-transparency from dithered grayscale
Use 24-bit BMP frames for maximum backward compatibility with older Windows versions
Avoid upscaling tiny JBG sources beyond 4x if preserving edge sharpness is critical
Embed multiple resolutions in one ICO to let OS pick the correct frame per DPI

Integration with Toolchains

Test the resulting ICO in Visual Studio resource files to confirm pixel alignment
Use icon editors (IcoFX, Greenfish) to validate alpha masks and reassign transparent pixels
Supply both 32-bit and legacy 8-bit frames to support older resource compilers
Automate batch conversions into icon packs for installers to streamline release builds
Confirm that app manifest or resource loader expects PNG or BMP frames to match output

Verification Before Deployment

Open ICO in Windows Explorer to verify crispness at 16, 32, and 256 px sizes
Compare source JBG and ICO frames in a pixel-viewer at 100% to detect resampling loss
Check that synthesized transparency does not introduce haloing against UI backgrounds
Validate that any necessary metadata is reattached externally before packaging
Keep originals archived; re-run conversion if different ICO encodings are required later

Fast Processing

Close unused tabs for maximum throughput.

Client-Side Privacy

No media leaves your device.

Broad Compatibility

Output files work across all operating systems.

Pro Tip

For batch conversions, process in groups of 20-50 files to optimize memory usage and avoid browser slowdowns.

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