Convert files in seconds — your files never leave your device.
Convert Word, Excel, PowerPoint, HEIC, WebP, AVIF, JPG, PNG, PDF and Markdown files right in your browser. No uploads, no sign-up, no waiting, no file size limits.
All conversion tools
Pick a tool, drop your files, download the result. Everything happens locally on your device.
HEIC to JPG
Convert iPhone HEIC/HEIF photos to JPG, PNG or WebP — free, private, unlimited.
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WebP to JPG
WebP & AVIF to JPG/PNG in one click. Perfect for downloaded web images.
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JPG ↔ PNG ↔ WebP
Convert between the three most common image formats, with quality control.
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Images to PDF
Combine photos into one PDF with drag-to-sort and live preview.
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PDF to JPG
Export PDF pages as JPG/PNG images at your chosen DPI.
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Markdown to PDF
Markdown to beautiful PDF with code highlighting & live preview.
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Office to PDF
Convert Word (incl. legacy .doc), Excel & PowerPoint to PDF — 100% local.
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PDF to Office
Convert PDF to Word, Excel & PowerPoint — editable text, 100% local.
Use now →Why ConvertZen?
A privacy-first converter that treats your files the way they should be treated — like they are yours.
100% Private
Your files are processed locally with WASM & Canvas. Nothing is ever uploaded.
Blazing fast
No upload, no queue, no waiting. Conversion starts the moment you drop.
Free forever
No limits, no watermarks, no sign-up. Every tool, every file size.
Works offline
Install as a PWA and keep converting with no internet at all.
How it works
Three steps, zero uploads.
Drop your files
Drag files anywhere on the page, click to choose, or press Ctrl+V to paste an image.
Convert instantly
Our in-browser engine converts your files locally. Progress is shown in real time.
Download the result
Grab single files or a ZIP of everything. Your originals never leave your device.
Latest guides
Practical, real-world write-ups from someone who actually uses these tools.
HEIC
HEIC to JPG: The Complete Guide for Windows, Mac & iPhone (2026)
Why iPhones shoot HEIC, why Windows chokes on it, and every reliable way to convert — tested this year.
WebP
WebP to JPG: How to Convert Without Losing Quality
What WebP actually is, which apps still reject it, and how to batch-convert downloaded web images cleanly.
Privacy
Why Browser-Based File Converters Are Safer Than Uploading Your Files
Contracts, medical records, client data: what actually happens when you upload to a cloud converter.