Convert files instantly. Keep them private.
ConvertSwift offers high-fidelity media tools running entirely inside your web browser. No uploads, no server delays, and absolute data privacy.
Image Resizer
Resize images to custom pixel dimensions or percentages without quality loss.
ActiveImage Compressor
Optimize JPG, PNG, and WEBP file sizes instantly in the browser.
ActiveFormat Converter
Convert images between WebP, PNG, JPG, and AVIF formats.
ActivePDF to Word
Convert and extract text from PDF files into editable DOCX format.
ActiveJPG to PDF
Combine multiple JPG, PNG or WEBP photos into a single clean PDF document.
Coming SoonPDF Merger
Combine two or more PDF files into a single document in any order.
Coming SoonPDF Compressor
Reduce PDF file size locally in your browser memory without server uploads.
Coming SoonVideo Compressor
Reduce video file size locally using fast in-browser codecs.
Coming SoonMarkdown to HTML
Convert rich Markdown syntax into structured HTML code templates.
Coming SoonThree Simple Steps to Convert
ConvertSwift runs entirely in memory. It operates in three basic, offline-capable stages.
Select Your Tool
Browse our directory of 14+ conversion panels including PDF, Image, Video, and Development utility modules.
Load Your Media
Drag and drop your local files into the browser. Files are decoded securely in your device's browser memory.
Download Output
Execute adjustments at native processor speed. Save your converted output files instantly—no upload delays.
0
Files Uploaded to Servers
Instant
Processing Velocity
$0
Subscription Requirements
0%
Data Breach Vulnerability
ConvertSwift vs. Cloud Converters
Why local sandbox utilities are the future of file conversion interfaces.
| Feature Spec | ConvertSwift (Local) | Traditional Cloud Tools |
|---|---|---|
| In-Browser Processing (Client-Side) | Yes (Runs locally via JavaScript / WebAssembly) | No (Sends file data over public networks to servers) |
| Strict Privacy Guarantee | Yes (Files never leave system; no logs are stored) | No (Files are processed and cached on cloud servers) |
| File Size Limits | Unlimited (Load a 500MB raw photo instantly) | Capped (Pay/upgrade required for files over 100MB) |
| Offline Mode Functionality | Yes (Compress files on an airplane without internet) | No (Conversion fails instantly if network drops) |
| Ad-Free & Unlimited Runs | Yes (No popup ads, unlimited runs) | Capped (Aggressive popups, limits daily runs) |
Zero uploads. Total security.
Traditional converters require upload limits and storage of your personal data on external servers. We do things differently.
Client-Side Processing
All file processing runs inside your browser using JavaScript and WebAssembly. Your images, PDFs, and videos never touch our servers.
Infinite Speed
Forget about waiting for uploads and downloads. ConvertSwift parses and converts your documents instantly at native CPU speeds.
Always Free, No Caps
Because there is no expensive server-side conversion bandwidth, we don't have to charge you. Convert massive files without subscription blockades.
What Developers & Editors Say
See why users choose in-browser media compression utilities.
"Having an image resizer that runs entirely locally inside my browser makes compiling newsletter visual assets a breeze. I don't worry about data leaks anymore, and it saves me gigabytes of uploads daily."
"Perfect tool for developer utilities. The base64 converters and JSON formatting operations are instant since they don't depend on network request latencies. Looking forward to Phase 2 tools!"
Frequently Asked Questions
Learn more about client-side file tools and privacy.
• Image Resizer: Supports input of JPG, JPEG, PNG, and WebP formats up to 50MB.
• Image Compressor: Supports JPEG, PNG, and WebP compression. Transparent PNGs can be converted to WebPs to retain alpha channels.
• Format Converter: Supports input of JPG, JPEG, PNG, WebP, and Apple HEIC/HEIF files up to 100MB per file.