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Convert999

Free online file converter supporting 400+ formats. Fast, secure, and private.

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Made with for the web

HomeFile Converter for Developers

File Converter for Developers

Convert data files, configurations, and assets programmatically. JSON, CSV, XML, and 400+ formats supported.

Choose Files

or drag and drop files here

Max file size: 2GB

Your files are processed locally in your browser. Nothing is uploaded to any server.

Popular Conversions

CSVXLSX
Import data into spreadsheets
JSONCSV
Export API data to CSV
PNGWEBP
Optimize web assets
MP4WEBM
Web-compatible video format
DOCXPDF
Generate PDF documentation
SVGPNG
Generate raster icons

Why Convert999?

Browser-based — no server-side processing
No API key required
WebAssembly-powered for maximum speed
Privacy-first: files stay in your browser
Open format support (WebP, WebM, OGG)
Batch processing for build pipelines

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File Tools

Compress, resize, merge

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Other Use Cases

Students

6 popular conversions

Designers

6 popular conversions

Businesses

6 popular conversions

Content Creators

6 popular conversions

Educators

6 popular conversions

Photographers

6 popular conversions

Marketers

6 popular conversions

Legal Professionals

6 popular conversions

Musicians & Audio Engineers

6 popular conversions

Video Editors

6 popular conversions