Are my files ever uploaded to any server or cloud?

Never. FileConvert is 100% client-side. When you drop or select a file, your browser processes the bytes directly in device memory using HTML5 Canvas and pdf-lib. Zero bytes of your sensitive images or documents ever leave your phone or computer. You can verify this by turning off your internet connection—all tools will continue working normally.

Which image formats are supported for compression & conversion?

FileConvert supports all common formats including PNG, JPG/JPEG, WebP, GIF, SVG, and BMP. You can cross-convert between WebP, PNG, and JPG while choosing your exact target quality or specifying an exact target file size in kilobytes (KB).

How does client-side PDF merging work in the browser?

We use pdf-lib, an open-source binary PDF manipulation library running in browser JavaScript. It reads the raw byte streams of your PDF files, parses the page dictionary structures, copies page streams into a consolidated document, and serializes the new PDF binary directly to your local downloads without requiring backend server rendering.

Is there any file size limit?

Unlike traditional online converters that impose 5MB or 10MB limits, FileConvert has zero arbitrary server limits. The only constraint is your device’s available browser memory (RAM). Most modern smartphones and laptops easily process files up to 200MB+ in seconds.

How is performance and low INP (Interaction to Next Paint) maintained?

Heavy operations like image downsampling, quantization, and PDF byte stream packing are scheduled with asynchronous microtasks. This yields control back to the browser main thread between computational steps, ensuring the UI stays fluid at 60fps with minimal input latency during high-resolution processing.

Our Mission & Technology

About FileConvert

We built FileConvert around a single fundamental principle: Your personal files, photos, and documents should never have to leave your phone or laptop just to be converted or compressed.

Why We Reimagined File Conversion

For years, resizing an image under 50KB or merging two PDF pages required uploading your sensitive bank records, identity cards, medical scans, or family photos to anonymous cloud servers. Users endured sluggish upload bars, intrusive pop-up ads, file size limits, and privacy anxiety over where their files were being stored.

Modern mobile devices and laptops are computational powerhouses. With advances in HTML5 Canvas APIs, WebAssembly, and JavaScript workers, your device can compress and convert files faster than a server can even upload them—while preserving 100% of your privacy.

The Engine Under the Hood

WebAssembly & Canvas

Client-side bicubic resampling and discrete cosine quantization execute on your device's graphics processor with low INP responsiveness.

Local HEIC Decoding

Uses heic2any via dynamic SSR-safe imports to unpack Apple iPhone HEIC and HEIF photos locally without cloud round-trips.

Two-Tier PDF Engine

Lossless cross-reference stream packing with pdf-lib plus deep canvas rasterization with pdfjs-dist for heavy scans.

Our Core Promises to Users

Zero Server Storage: Your files never travel over the network or land in cloud buckets.

Always Free & No Signup: Instant access to all presets without email gates or subscription paywalls.

Installable PWA: Add to your smartphone home screen for instant offline utility access.