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Convert Files & Images
100% Free & Locally in Browser

Instant format conversions for JPG, PNG, WebP, GIF, PDF & Word documents. Files are processed locally on your device for max speed & privacy.

🔒
Privacy First Guarantee: Files are processed locally in your browser whenever possible. Your files are never uploaded to any external server.
🖼️
JPG to PNG
Convert JPG photos to high-quality transparent PNG format.
Browser-Side
📸
PNG to JPG
Convert PNG graphics into optimized JPG photos with background fill.
Browser-Side
⚡
JPG to WebP
Convert JPG images to modern WebP format for 40% faster web page loading.
Popular
🚀
PNG to WebP
Convert PNG images to lossy or lossless WebP while preserving quality.
Browser-Side
📷
WebP to JPG
Convert next-gen WebP images back into standard JPG compatibility.
Browser-Side
🎨
WebP to PNG
Convert WebP images to lossless PNG format with transparent alpha channel.
Browser-Side
🎬
GIF to JPG
Extract frames from GIF animations and convert them into crisp JPG images.
Browser-Side
🔄
Universal Image Converter
Batch convert between PNG, JPG, WebP, BMP, SVG, and ICO formats instantly.
Multi-Format
📉
图片压缩器
Compress image file size up to 90% without losing visual quality.
High Savings
📐
图片调整大小
Resize image dimensions by pixels or percentage with aspect ratio lock.
Browser-Side
📝
Text to PDF
Convert text documents or copy-pasted text into styled PDF files.
Document
📚
Images to PDF
Combine multiple photos or scans into a single organized PDF document.
Popular
📑
PDF to Images
Extract pages from any PDF document and save them as PNG or JPG images.
Browser-Side
📄
DOCX to PDF
Convert Microsoft Word DOCX files to PDF documents in your browser.
Document
✂️
PDF 裁剪器
在线免费裁剪 PDF 文档页面边距（上、下、左、右）。
New Tool
👁️
PDF 阅读器
具有缩放、页面导航和搜索功能在浏览器中查看 PDF 文档。
New Tool
🔍
PDF & Image OCR
Extract readable text from scanned PDFs and photos using browser OCR.
New Tool
📑
PDF 合并器
Merge multiple PDF files into a single master PDF document.
Multi-Page
🎵
MP4 to MP3
Extract high-quality MP3 audio from MP4 video files.
Audio Extract
🎧
MP3 to WAV
将压缩的 MP3 音频转换为无损 WAV 格式。
Lossless
🎼
WAV to MP3
将沉重的 WAV 声音文件缩小为轻巧的 MP3 格式。
High Savings
📹
MOV to MP4
将 Apple QuickTime MOV 录音转换为通用 MP4。
Universal
📉
视频压缩器
在浏览器本地缩小 MP4 和 WEBM 视频文件大小。
Video Shrink
🎶
通用音频转换器
批量转换 MP3、WAV、OGG 和 AAC 音频文件。
Multi-Format
🎬
通用视频转换器
转换视频、压缩码率或提取 MP3 音频。
Video Suite
🎵
人声伴奏分离器 (Karaoke)
一键分离歌曲中的人声与伴奏，制作高品质卡拉OK伴奏音乐。
伴奏提取
🗣️
文本转语音 (TTS)
将文本文字转换为自然流畅的真人语音，支持语速调节。
语音合成

Why Choose Online File & Image Converter?

🔐

100% Client-Side Privacy

Your files are processed locally inside your web browser window. Zero bytes are uploaded to remote cloud servers or stored in external databases.

⚡

Lightning Fast Speed

No waiting in server upload queues. Conversion executes instantly using your computer or mobile device's native CPU and Web Workers.

📦

Batch ZIP Packaging

Convert dozens of files simultaneously and download all output documents packaged together in a single convenient ZIP file archive.

🌐

100% Free & Unlimited

Unlimited daily conversions, no account sign-ups, no email registration, no watermarks, and no paid API keys required.

📱

Cross-Platform Mobile Ready

Fully responsive interface optimized for desktop computers, laptops, iPads, tablets, iPhones, and Android smartphones.

🔍

Built-In Tesseract OCR

Recognize and extract copyable text from scanned PDFs and photos locally using client-side Tesseract.js optical character recognition.

How to Convert Files in 4 Simple Steps

01

Select or Drag Files

Choose a converter tool and drag & drop your images or documents into the high-DPI dropzone.

02

配置参数

Set your target format, image compression quality, resize dimensions, or crop box region.

03

Instant Browser Execution

Click Convert to initiate local HTML5 Canvas, Web Worker, or PDF-Lib processing.

04

下载结果

Save converted files individually or download all results bundled in a single ZIP file.

Supported File Formats & 技术规格 Matrix

Category Input Formats 输出格式s 处理引擎 Security Guarantee
Image Conversion JPG, PNG, WebP, GIF, BMP, ICO PNG, JPG, WebP, BMP, ICO HTML5 Canvas 2D / WebAssembly 🔒 100% Client-Side
Image Compression JPG, PNG, WebP Compressed JPG / PNG / WebP Canvas Quantization Engine 🔒 100% Client-Side
Image Resizing JPG, PNG, WebP, GIF, BMP Resized Image (px / %) Bicubic Canvas Downsampler 🔒 100% Client-Side
PDF Compilation JPG, PNG, WebP, Text (.txt) Multi-Page PDF PDF-Lib Engine 🔒 100% Client-Side
PDF Extraction PDF Document PNG / JPG / Images Mozilla PDF.js Renderer 🔒 100% Client-Side
Word Document Microsoft Word (.docx) PDF Document Mammoth.js & Html2Canvas 🔒 100% Client-Side
PDF Cropping PDF Document Cropped PDF (pt/mm/in) Interactive Canvas & PDF-Lib 🔒 100% Client-Side
PDF OCR Extractor Scanned PDF / Images Copyable Text / .TXT File Tesseract.js Web Workers 🔒 100% Client-Side

Why Online File & Image Converter is Built 100% Client-Side

Traditional file conversion websites require you to upload your sensitive contracts, financial spreadsheets, family photographs, and legal PDFs to external cloud servers. Once uploaded, your files are stored on unknown third-party servers, creating significant privacy risks and network bottlenecks.

Online File & Image Converter takes a fundamentally different approach. Utilizing modern web capabilities like HTML5 Canvas, WebAssembly, Mozilla PDF.js, PDF-Lib, Mammoth.js, and Tesseract.js, all file transformations execute directly inside your browser window. Your files never cross the Internet, guaranteeing 100% privacy, instant processing, and zero server upload limits.

常见问题解答 (FAQ)

Is this file converter completely free to use? ➕
Yes! All file and image converter tools on our website are 100% free with no hidden fees, subscriptions, or file conversion limits.
Are my files safe and private? ➕
辦Absolutely. Files are processed locally inside your web browser using HTML5 Web Workers and Canvas APIs. Your files are never uploaded to any remote server or third-party cloud.
How does client-side file conversion work? ➕
Modern web browsers contain powerful JavaScript engines capable of decoding image pixels, parsing PDF structures, and recognizing text using WebAssembly. By processing files in browser RAM, conversion happens in real-time on your computer or smartphone without uploading data.
Can I convert multiple files at once (批量转换)? ➕
Yes! You can drag and drop multiple files to convert them simultaneously and download all results in a single convenient ZIP file.
Does this website work on mobile devices? ➕
Yes, our website is fully responsive and optimized for touch controls on smartphones and tablets, including iOS Safari and Android Chrome.
Why should I convert JPG images to WebP for my website? ➕
WebP is a next-generation image format created by Google that produces file sizes 30% to 50% smaller than JPG at equivalent visual quality. Converting your images to WebP speeds up website loading times and improves Google PageSpeed Insights scores.
How does PDF Cropping and PDF OCR work? ➕
PDF 裁剪器 allows you to visually drag a crop box or enter exact numeric margins in pt, mm, or inches to trim PDF page borders. PDF OCR uses Tesseract.js in Web Workers to recognize and extract copyable text from scanned PDFs without cloud server APIs.
Is there any file size or conversion limit? ➕
No daily or file size limits! Because conversions run locally on your device, you are only limited by your device's available memory.