File Converter for Developers

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

ファイルを選択

またはファイルをここにドラッグ＆ドロップ

最大ファイルサイズ：2GB

ファイルはブラウザ内でローカルに処理されます。サーバーにアップロードされません。

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

Explore More

File Tools

Compress, resize, merge

Blog

Tips & guides

Compare Formats

Side-by-side analysis

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